94deaf69dcd33462c61fa8cabb0883e3085a1046
1231 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Mike Rapoport (Microsoft)
|
101d647080 |
docs: move numa=fake description to kernel-parameters.txt
NUMA emulation can be now enabled on arm64 and riscv in addition to x86. Move description of numa=fake parameters from x86 documentation of admin-guide/kernel-parameters.txt Link: https://lkml.kernel.org/r/20240807064110.1003856-27-rppt@kernel.org Suggested-by: Zi Yan <ziy@nvidia.com> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> [arm64 + CXL via QEMU] Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: David S. Miller <davem@davemloft.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Rob Herring (Arm) <robh@kernel.org> Cc: Samuel Holland <samuel.holland@sifive.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
dd4d30d1cd |
mm: override mTHP "enabled" defaults at kernel cmdline
Add thp_anon= cmdline parameter to allow specifying the default enablement of each supported anon THP size. The parameter accepts the following format and can be provided multiple times to configure each size: thp_anon=<size>,<size>[KMG]:<value>;<size>-<size>[KMG]:<value> An example: thp_anon=16K-64K:always;128K,512K:inherit;256K:madvise;1M-2M:never See Documentation/admin-guide/mm/transhuge.rst for more details. Configuring the defaults at boot time is useful to allow early user space to take advantage of mTHP before its been configured through sysfs. [v-songbaohua@oppo.com: use get_oder() and check size is is_power_of_2] Link: https://lkml.kernel.org/r/20240814224635.43272-1-21cnbao@gmail.com [ryan.roberts@arm.com: some minor cleanup according to David's comments] Link: https://lkml.kernel.org/r/20240820105244.62703-1-21cnbao@gmail.com Link: https://lkml.kernel.org/r/20240814020247.67297-1-21cnbao@gmail.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Co-developed-by: Barry Song <v-songbaohua@oppo.com> Signed-off-by: Barry Song <v-songbaohua@oppo.com> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lance Yang <ioworker0@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Tetsuo Handa
|
b88f55389a |
profiling: remove profile=sleep support
The kernel sleep profile is no longer working due to a recursive locking bug introduced by commit |
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Sven Schnelle
|
035248a784 |
s390/alternatives: Remove noaltinstr option
The current Kernel doesn't boot without alternative patching on z16 machines. To avoid such bugs in the future, remove the option disable alternative patching. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Linus Torvalds
|
fbc90c042c |
Merge tag 'mm-stable-2024-07-21-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- In the series "mm: Avoid possible overflows in dirty throttling" Jan
Kara addresses a couple of issues in the writeback throttling code.
These fixes are also targetted at -stable kernels.
- Ryusuke Konishi's series "nilfs2: fix potential issues related to
reserved inodes" does that. This should actually be in the
mm-nonmm-stable tree, along with the many other nilfs2 patches. My
bad.
- More folio conversions from Kefeng Wang in the series "mm: convert to
folio_alloc_mpol()"
- Kemeng Shi has sent some cleanups to the writeback code in the series
"Add helper functions to remove repeated code and improve readability
of cgroup writeback"
- Kairui Song has made the swap code a little smaller and a little
faster in the series "mm/swap: clean up and optimize swap cache
index".
- In the series "mm/memory: cleanly support zeropage in
vm_insert_page*(), vm_map_pages*() and vmf_insert_mixed()" David
Hildenbrand has reworked the rather sketchy handling of the use of
the zeropage in MAP_SHARED mappings. I don't see any runtime effects
here - more a cleanup/understandability/maintainablity thing.
- Dev Jain has improved selftests/mm/va_high_addr_switch.c's handling
of higher addresses, for aarch64. The (poorly named) series is
"Restructure va_high_addr_switch".
- The core TLB handling code gets some cleanups and possible slight
optimizations in Bang Li's series "Add update_mmu_tlb_range() to
simplify code".
- Jane Chu has improved the handling of our
fake-an-unrecoverable-memory-error testing feature MADV_HWPOISON in
the series "Enhance soft hwpoison handling and injection".
- Jeff Johnson has sent a billion patches everywhere to add
MODULE_DESCRIPTION() to everything. Some landed in this pull.
- In the series "mm: cleanup MIGRATE_SYNC_NO_COPY mode", Kefeng Wang
has simplified migration's use of hardware-offload memory copying.
- Yosry Ahmed performs more folio API conversions in his series "mm:
zswap: trivial folio conversions".
- In the series "large folios swap-in: handle refault cases first",
Chuanhua Han inches us forward in the handling of large pages in the
swap code. This is a cleanup and optimization, working toward the end
objective of full support of large folio swapin/out.
- In the series "mm,swap: cleanup VMA based swap readahead window
calculation", Huang Ying has contributed some cleanups and a possible
fixlet to his VMA based swap readahead code.
- In the series "add mTHP support for anonymous shmem" Baolin Wang has
taught anonymous shmem mappings to use multisize THP. By default this
is a no-op - users must opt in vis sysfs controls. Dramatic
improvements in pagefault latency are realized.
- David Hildenbrand has some cleanups to our remaining use of
page_mapcount() in the series "fs/proc: move page_mapcount() to
fs/proc/internal.h".
- David also has some highmem accounting cleanups in the series
"mm/highmem: don't track highmem pages manually".
- Build-time fixes and cleanups from John Hubbard in the series
"cleanups, fixes, and progress towards avoiding "make headers"".
- Cleanups and consolidation of the core pagemap handling from Barry
Song in the series "mm: introduce pmd|pte_needs_soft_dirty_wp helpers
and utilize them".
- Lance Yang's series "Reclaim lazyfree THP without splitting" has
reduced the latency of the reclaim of pmd-mapped THPs under fairly
common circumstances. A 10x speedup is seen in a microbenchmark.
It does this by punting to aother CPU but I guess that's a win unless
all CPUs are pegged.
- hugetlb_cgroup cleanups from Xiu Jianfeng in the series
"mm/hugetlb_cgroup: rework on cftypes".
- Miaohe Lin's series "Some cleanups for memory-failure" does just that
thing.
- Someone other than SeongJae has developed a DAMON feature in Honggyu
Kim's series "DAMON based tiered memory management for CXL memory".
This adds DAMON features which may be used to help determine the
efficiency of our placement of CXL/PCIe attached DRAM.
- DAMON user API centralization and simplificatio work in SeongJae
Park's series "mm/damon: introduce DAMON parameters online commit
function".
- In the series "mm: page_type, zsmalloc and page_mapcount_reset()"
David Hildenbrand does some maintenance work on zsmalloc - partially
modernizing its use of pageframe fields.
- Kefeng Wang provides more folio conversions in the series "mm: remove
page_maybe_dma_pinned() and page_mkclean()".
- More cleanup from David Hildenbrand, this time in the series
"mm/memory_hotplug: use PageOffline() instead of PageReserved() for
!ZONE_DEVICE". It "enlightens memory hotplug more about PageOffline()
pages" and permits the removal of some virtio-mem hacks.
- Barry Song's series "mm: clarify folio_add_new_anon_rmap() and
__folio_add_anon_rmap()" is a cleanup to the anon folio handling in
preparation for mTHP (multisize THP) swapin.
- Kefeng Wang's series "mm: improve clear and copy user folio"
implements more folio conversions, this time in the area of large
folio userspace copying.
- The series "Docs/mm/damon/maintaier-profile: document a mailing tool
and community meetup series" tells people how to get better involved
with other DAMON developers. From SeongJae Park.
- A large series ("kmsan: Enable on s390") from Ilya Leoshkevich does
that.
- David Hildenbrand sends along more cleanups, this time against the
migration code. The series is "mm/migrate: move NUMA hinting fault
folio isolation + checks under PTL".
- Jan Kara has found quite a lot of strangenesses and minor errors in
the readahead code. He addresses this in the series "mm: Fix various
readahead quirks".
- SeongJae Park's series "selftests/damon: test DAMOS tried regions and
{min,max}_nr_regions" adds features and addresses errors in DAMON's
self testing code.
- Gavin Shan has found a userspace-triggerable WARN in the pagecache
code. The series "mm/filemap: Limit page cache size to that supported
by xarray" addresses this. The series is marked cc:stable.
- Chengming Zhou's series "mm/ksm: cmp_and_merge_page() optimizations
and cleanup" cleans up and slightly optimizes KSM.
- Roman Gushchin has separated the memcg-v1 and memcg-v2 code - lots of
code motion. The series (which also makes the memcg-v1 code
Kconfigurable) are "mm: memcg: separate legacy cgroup v1 code and put
under config option" and "mm: memcg: put cgroup v1-specific memcg
data under CONFIG_MEMCG_V1"
- Dan Schatzberg's series "Add swappiness argument to memory.reclaim"
adds an additional feature to this cgroup-v2 control file.
- The series "Userspace controls soft-offline pages" from Jiaqi Yan
permits userspace to stop the kernel's automatic treatment of
excessive correctable memory errors. In order to permit userspace to
monitor and handle this situation.
- Kefeng Wang's series "mm: migrate: support poison recover from
migrate folio" teaches the kernel to appropriately handle migration
from poisoned source folios rather than simply panicing.
- SeongJae Park's series "Docs/damon: minor fixups and improvements"
does those things.
- In the series "mm/zsmalloc: change back to per-size_class lock"
Chengming Zhou improves zsmalloc's scalability and memory
utilization.
- Vivek Kasireddy's series "mm/gup: Introduce memfd_pin_folios() for
pinning memfd folios" makes the GUP code use FOLL_PIN rather than
bare refcount increments. So these paes can first be moved aside if
they reside in the movable zone or a CMA block.
- Andrii Nakryiko has added a binary ioctl()-based API to
/proc/pid/maps for much faster reading of vma information. The series
is "query VMAs from /proc/<pid>/maps".
- In the series "mm: introduce per-order mTHP split counters" Lance
Yang improves the kernel's presentation of developer information
related to multisize THP splitting.
- Michael Ellerman has developed the series "Reimplement huge pages
without hugepd on powerpc (8xx, e500, book3s/64)". This permits
userspace to use all available huge page sizes.
- In the series "revert unconditional slab and page allocator fault
injection calls" Vlastimil Babka removes a performance-affecting and
not very useful feature from slab fault injection.
* tag 'mm-stable-2024-07-21-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (411 commits)
mm/mglru: fix ineffective protection calculation
mm/zswap: fix a white space issue
mm/hugetlb: fix kernel NULL pointer dereference when migrating hugetlb folio
mm/hugetlb: fix possible recursive locking detected warning
mm/gup: clear the LRU flag of a page before adding to LRU batch
mm/numa_balancing: teach mpol_to_str about the balancing mode
mm: memcg1: convert charge move flags to unsigned long long
alloc_tag: fix page_ext_get/page_ext_put sequence during page splitting
lib: reuse page_ext_data() to obtain codetag_ref
lib: add missing newline character in the warning message
mm/mglru: fix overshooting shrinker memory
mm/mglru: fix div-by-zero in vmpressure_calc_level()
mm/kmemleak: replace strncpy() with strscpy()
mm, page_alloc: put should_fail_alloc_page() back behing CONFIG_FAIL_PAGE_ALLOC
mm, slab: put should_failslab() back behind CONFIG_SHOULD_FAILSLAB
mm: ignore data-race in __swap_writepage
hugetlbfs: ensure generic_hugetlb_get_unmapped_area() returns higher address than mmap_min_addr
mm: shmem: rename mTHP shmem counters
mm: swap_state: use folio_alloc_mpol() in __read_swap_cache_async()
mm/migrate: putback split folios when numa hint migration fails
...
|
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Linus Torvalds
|
2c9b351240 |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm updates from Paolo Bonzini:
"ARM:
- Initial infrastructure for shadow stage-2 MMUs, as part of nested
virtualization enablement
- Support for userspace changes to the guest CTR_EL0 value, enabling
(in part) migration of VMs between heterogenous hardware
- Fixes + improvements to pKVM's FF-A proxy, adding support for v1.1
of the protocol
- FPSIMD/SVE support for nested, including merged trap configuration
and exception routing
- New command-line parameter to control the WFx trap behavior under
KVM
- Introduce kCFI hardening in the EL2 hypervisor
- Fixes + cleanups for handling presence/absence of FEAT_TCRX
- Miscellaneous fixes + documentation updates
LoongArch:
- Add paravirt steal time support
- Add support for KVM_DIRTY_LOG_INITIALLY_SET
- Add perf kvm-stat support for loongarch
RISC-V:
- Redirect AMO load/store access fault traps to guest
- perf kvm stat support
- Use guest files for IMSIC virtualization, when available
s390:
- Assortment of tiny fixes which are not time critical
x86:
- Fixes for Xen emulation
- Add a global struct to consolidate tracking of host values, e.g.
EFER
- Add KVM_CAP_X86_APIC_BUS_CYCLES_NS to allow configuring the
effective APIC bus frequency, because TDX
- Print the name of the APICv/AVIC inhibits in the relevant
tracepoint
- Clean up KVM's handling of vendor specific emulation to
consistently act on "compatible with Intel/AMD", versus checking
for a specific vendor
- Drop MTRR virtualization, and instead always honor guest PAT on
CPUs that support self-snoop
- Update to the newfangled Intel CPU FMS infrastructure
- Don't advertise IA32_PERF_GLOBAL_OVF_CTRL as an MSR-to-be-saved, as
it reads '0' and writes from userspace are ignored
- Misc cleanups
x86 - MMU:
- Small cleanups, renames and refactoring extracted from the upcoming
Intel TDX support
- Don't allocate kvm_mmu_page.shadowed_translation for shadow pages
that can't hold leafs SPTEs
- Unconditionally drop mmu_lock when allocating TDP MMU page tables
for eager page splitting, to avoid stalling vCPUs when splitting
huge pages
- Bug the VM instead of simply warning if KVM tries to split a SPTE
that is non-present or not-huge. KVM is guaranteed to end up in a
broken state because the callers fully expect a valid SPTE, it's
all but dangerous to let more MMU changes happen afterwards
x86 - AMD:
- Make per-CPU save_area allocations NUMA-aware
- Force sev_es_host_save_area() to be inlined to avoid calling into
an instrumentable function from noinstr code
- Base support for running SEV-SNP guests. API-wise, this includes a
new KVM_X86_SNP_VM type, encrypting/measure the initial image into
guest memory, and finalizing it before launching it. Internally,
there are some gmem/mmu hooks needed to prepare gmem-allocated
pages before mapping them into guest private memory ranges
This includes basic support for attestation guest requests, enough
to say that KVM supports the GHCB 2.0 specification
There is no support yet for loading into the firmware those signing
keys to be used for attestation requests, and therefore no need yet
for the host to provide certificate data for those keys.
To support fetching certificate data from userspace, a new KVM exit
type will be needed to handle fetching the certificate from
userspace.
An attempt to define a new KVM_EXIT_COCO / KVM_EXIT_COCO_REQ_CERTS
exit type to handle this was introduced in v1 of this patchset, but
is still being discussed by community, so for now this patchset
only implements a stub version of SNP Extended Guest Requests that
does not provide certificate data
x86 - Intel:
- Remove an unnecessary EPT TLB flush when enabling hardware
- Fix a series of bugs that cause KVM to fail to detect nested
pending posted interrupts as valid wake eents for a vCPU executing
HLT in L2 (with HLT-exiting disable by L1)
- KVM: x86: Suppress MMIO that is triggered during task switch
emulation
Explicitly suppress userspace emulated MMIO exits that are
triggered when emulating a task switch as KVM doesn't support
userspace MMIO during complex (multi-step) emulation
Silently ignoring the exit request can result in the
WARN_ON_ONCE(vcpu->mmio_needed) firing if KVM exits to userspace
for some other reason prior to purging mmio_needed
See commit
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Linus Torvalds
|
d2be38b9a5 |
Merge tag 'mips_6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS updates from Thomas Bogendoerfer: - add support for Realtek RTL9302C - add support for Mobileye EyeQ6H - add support for Mobileye EyeQ OLB system controller - improve r4k clocksource - add mode for emulating ieee754 NAN2008 - rework for BMIPS CBR address handling - fixes for Loongson 2K1000 - defconfig updates - cleanups and fixes * tag 'mips_6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (58 commits) MIPS: config: Add ip30_defconfig MIPS: config: lemote2f: Regenerate defconfig MIPS: config: generic: Add board-litex MIPS: config: Enable MSA and virtualization for MIPS64R6 MIPS: Fix fallback march for SB1 mips: dts: realtek: Add RTL9302C board mips: generic: add fdt fixup for Realtek reference board mips: select REALTEK_OTTO_TIMER for Realtek platforms dt-bindings: interrupt-controller: realtek,rtl-intc: Add rtl9300-intc dt-bindings: mips: realtek: Add rtl930x-soc compatible dt-bindings: vendor-prefixes: Add Cameo Communications mips: dts: realtek: add device_type property to cpu node mips: dts: realtek: use "serial" instead of "uart" in node name MIPS: Implement ieee754 NAN2008 emulation mode MIPS: lantiq: improve USB initialization MIPS: GIC: Generate redirect block accessors MIPS: CPS: Add a couple of multi-cluster utility functions MIPS: Octeron: remove source file executable bit MAINTAINERS: Mobileye: add OLB drivers and dt-bindings MIPS: mobileye: eyeq5: add OLB system-controller node ... |
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Linus Torvalds
|
3f386cb8ee |
Merge tag 'pci-v6.11-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull pci updates from Bjorn Helgaas:
"Enumeration:
- Define PCIE_RESET_CONFIG_DEVICE_WAIT_MS for the generic 100ms
required after reset before config access (Kevin Xie)
- Define PCIE_T_RRS_READY_MS for the generic 100ms required after
reset before config access (probably should be unified with
PCIE_RESET_CONFIG_DEVICE_WAIT_MS) (Damien Le Moal)
Resource management:
- Rename find_resource() to find_resource_space() to be more
descriptive (Ilpo Järvinen)
- Export find_resource_space() for use by PCI core, which needs to
learn whether there is available space for a bridge window (Ilpo
Järvinen)
- Prevent double counting of resources so window size doesn't grow on
each remove/rescan cycle (Ilpo Järvinen)
- Relax bridge window sizing algorithm so a device doesn't break
simply because it was removed and rescanned (Ilpo Järvinen)
- Evaluate the ACPI PRESERVE_BOOT_CONFIG _DSM in
pci_register_host_bridge() (not acpi_pci_root_create()) so we can
unify it with similar DT functionality (Vidya Sagar)
- Extend use of DT "linux,pci-probe-only" property so it works
per-host bridge as well as globally (Vidya Sagar)
- Unify support for ACPI PRESERVE_BOOT_CONFIG _DSM and the DT
"linux,pci-probe-only" property in pci_preserve_config() (Vidya
Sagar)
Driver binding:
- Add devres infrastructure for managed request and map of partial
BAR resources (Philipp Stanner)
- Deprecate pcim_iomap_table() because uses like
"pcim_iomap_table()[0]" have no good way to return errors (Philipp
Stanner)
- Add an always-managed pcim_request_region() for use instead of
pci_request_region() and similar, which are sometimes managed
depending on whether pcim_enable_device() has been called
previously (Philipp Stanner)
- Reimplement pcim_set_mwi() so it doesn't need to keep store MWI
state (Philipp Stanner)
- Add pcim_intx() for use instead of pci_intx(), which is sometimes
managed depending on whether pcim_enable_device() has been called
previously (Philipp Stanner)
- Add managed pcim_iomap_range() to allow mapping of a partial BAR
(Philipp Stanner)
- Fix a devres mapping leak in drm/vboxvideo (Philipp Stanner)
Error handling:
- Add missing bridge locking in device reset path and add a warning
for other possible lock issues (Dan Williams)
- Fix use-after-free on concurrent DPC and hot-removal (Lukas Wunner)
Power management:
- Disable AER and DPC during suspend to avoid spurious wakeups if
they share an interrupt with PME (Kai-Heng Feng)
PCIe native device hotplug:
- Detect if a device was removed or replaced during system sleep so
we don't assume a new device is the one that used to be there
(Lukas Wunner)
Virtualization:
- Add an ACS quirk for Broadcom BCM5760X multi-function NIC; it
prevents transactions between functions even though it doesn't
advertise ACS, so the functions can be attached individually via
VFIO (Ajit Khaparde)
Peer-to-peer DMA:
- Add a "pci=config_acs=" kernel command-line parameter to relax
default ACS settings to enable additional peer-to-peer
configurations. Requires expert knowledge of topology and ACS
operation (Vidya Sagar)
Endpoint framework:
- Remove unused struct pci_epf_group.type_group (Christophe JAILLET)
- Fix error handling in vpci_scan_bus() and epf_ntb_epc_cleanup()
(Dan Carpenter)
- Make struct pci_epc_class constant (Greg Kroah-Hartman)
- Remove unused pci_endpoint_test_bar_{readl,writel} functions
(Jiapeng Chong)
- Rename "BME" to "Bus Master Enable" (Manivannan Sadhasivam)
- Rename struct pci_epc_event_ops.core_init() callback to epc_init()
(Manivannan Sadhasivam)
- Move DMA init to MHI .epc_init() callback for uniformity
(Manivannan Sadhasivam)
- Cancel EPF test delayed work when link goes down (Manivannan
Sadhasivam)
- Add struct pci_epc_event_ops.epc_deinit() callback for cleanup
needed on fundamental reset (Manivannan Sadhasivam)
- Add 64KB alignment to endpoint test to support Rockchip rk3588
(Niklas Cassel)
- Optimize endpoint test by using memcpy() instead of readl() (Niklas
Cassel)
Device tree bindings:
- Add generic "ats-supported" property to advertise that a PCIe Root
Complex supports ATS (Jean-Philippe Brucker)
Amazon Annapurna Labs PCIe controller driver:
- Validate IORESOURCE_BUS presence to avoid NULL pointer dereference
(Aleksandr Mishin)
Axis ARTPEC-6 PCIe controller driver:
- Rename .cpu_addr_fixup() parameter to reflect that it is a PCI
address, not a CPU address (Niklas Cassel)
Freescale i.MX6 PCIe controller driver:
- Convert to agnostic GPIO API (Andy Shevchenko)
Freescale Layerscape PCIe controller driver:
- Make struct mobiveil_rp_ops constant (Christophe JAILLET)
- Use new generic dw_pcie_ep_linkdown() to handle link-down events
(Manivannan Sadhasivam)
HiSilicon Kirin PCIe controller driver:
- Convert to agnostic GPIO API (Andy Shevchenko)
- Use _scoped() iterator for OF children to ensure refcounts are
decremented at loop exit (Javier Carrasco)
Intel VMD host bridge driver:
- Create sysfs "domain" symlink before downstream devices are exposed
to userspace by pci_bus_add_devices() (Jiwei Sun)
Loongson PCIe controller driver:
- Enable MSI when LS7A is used with new CPUs that have integrated
PCIe Root Complex, e.g., Loongson-3C6000, so downstream devices can
use MSI (Huacai Chen)
Microchip AXI PolarFlare PCIe controller driver:
- Move pcie-microchip-host.c to a new PLDA directory (Minda Chen)
- Factor PLDA generic items out to a common
plda,xpressrich3-axi-common.yaml binding (Minda Chen)
- Factor PLDA generic data structures and code out to shared
pcie-plda.h, pcie-plda-host.c (Minda Chen)
- Add PLDA generic interrupt handling with a .request_event_irq()
callback for vendor-specific events (Minda Chen)
- Add PLDA generic host init/deinit and map bus functions for use by
vendor-specific drivers (Minda Chen)
- Rework to use PLDA core (Minda Chen)
Microsoft Hyper-V host bridge driver:
- Return zero, not garbage, when reading PCI_INTERRUPT_PIN (Wei Liu)
NVIDIA Tegra194 PCIe controller driver:
- Remove unused struct tegra_pcie_soc (Dr. David Alan Gilbert)
- Set 64KB inbound ATU alignment restriction (Jon Hunter)
Qualcomm PCIe controller driver:
- Make the MHI reg region mandatory for X1E80100, since all PCIe
controllers have it (Abel Vesa)
- Prevent use of uninitialized data and possible error pointer
dereference (Dan Carpenter)
- Return error, not success, if dev_pm_opp_find_freq_floor() fails
(Dan Carpenter)
- Add Operating Performance Points (OPP) support to scale performance
state based on aggregate link bandwidth to improve SoC power
efficiency (Krishna chaitanya chundru)
- Vote for the CPU-PCIe ICC (interconnect) path to ensure it stays
active even if other drivers don't vote for it (Krishna chaitanya
chundru)
- Use devm_clk_bulk_get_all() to get all the clocks from DT to avoid
writing out all the clock names (Manivannan Sadhasivam)
- Add DT binding and driver support for the SA8775P SoC (Mrinmay
Sarkar)
- Add HDMA support for the SA8775P SoC (Mrinmay Sarkar)
- Override the SA8775P NO_SNOOP default to avoid possible memory
corruption (Mrinmay Sarkar)
- Make sure resources are disabled during PERST# assertion, even if
the link is already disabled (Manivannan Sadhasivam)
- Use new generic dw_pcie_ep_linkdown() to handle link-down events
(Manivannan Sadhasivam)
- Add DT and endpoint driver support for the SA8775P SoC (Mrinmay
Sarkar)
- Add Hyper DMA (HDMA) support for the SA8775P SoC and enable it in
the EPF MHI driver (Mrinmay Sarkar)
- Set PCIE_PARF_NO_SNOOP_OVERIDE to override the default NO_SNOOP
attribute on the SA8775P SoC (both Root Complex and Endpoint mode)
to avoid possible memory corruption (Mrinmay Sarkar)
Renesas R-Car PCIe controller driver:
- Demote WARN() to dev_warn_ratelimited() in rcar_pcie_wakeup() to
avoid unnecessary backtrace (Marek Vasut)
- Add DT and driver support for R-Car V4H (R8A779G0) host and
endpoint. This requires separate proprietary firmware (Yoshihiro
Shimoda)
Rockchip PCIe controller driver:
- Assert PERST# for 100ms after power is stable (Damien Le Moal)
- Wait PCIE_T_RRS_READY_MS (100ms) after reset before starting
configuration (Damien Le Moal)
- Use GPIOD_OUT_LOW flag while requesting ep_gpio to fix a firmware
crash on Qcom-based modems with Rockpro64 board (Manivannan
Sadhasivam)
Rockchip DesignWare PCIe controller driver:
- Factor common parts of rockchip-dw-pcie DT binding to be shared by
Root Complex and Endpoint mode (Niklas Cassel)
- Add missing INTx signals to common DT binding (Niklas Cassel)
- Add eDMA items to DT binding for Endpoint controller (Niklas
Cassel)
- Fix initial dw-rockchip PERST# GPIO value to prevent unnecessary
short assert/deassert that causes issues with some WLAN controllers
(Niklas Cassel)
- Refactor dw-rockchip and add support for Endpoint mode (Niklas
Cassel)
- Call pci_epc_init_notify() and drop dw_pcie_ep_init_notify()
wrapper (Niklas Cassel)
- Add error messages in .probe() error paths to improve user
experience (Uwe Kleine-König)
Samsung Exynos PCIe controller driver:
- Use bulk clock APIs to simplify clock setup (Shradha Todi)
StarFive PCIe controller driver:
- Add DT binding and driver support for the StarFive JH7110
PLDA-based PCIe controller (Minda Chen)
Synopsys DesignWare PCIe controller driver:
- Add generic support for sending PME_Turn_Off when system suspends
(Frank Li)
- Fix incorrect interpretation of iATU slot 0 after PERST#
assert/deassert (Frank Li)
- Use msleep() instead of usleep_range() while waiting for link
(Konrad Dybcio)
- Refactor dw_pcie_edma_find_chip() to enable adding support for
Hyper DMA (HDMA) (Manivannan Sadhasivam)
- Enable drivers to supply the eDMA channel count since some can't
auto detect this (Manivannan Sadhasivam)
- Call pci_epc_init_notify() and drop dw_pcie_ep_init_notify()
wrapper (Manivannan Sadhasivam)
- Pass the eDMA mapping format directly from drivers instead of
maintaining a capability for it (Manivannan Sadhasivam)
- Add generic dw_pcie_ep_linkdown() to notify EPF drivers about
link-down events and restore non-sticky DWC registers lost on link
down (Manivannan Sadhasivam)
- Add vendor-specific "apb" reg name, interrupt names, INTx names to
generic binding (Niklas Cassel)
- Enforce DWC restriction that 64-bit BARs must start with an
even-numbered BAR (Niklas Cassel)
- Consolidate args of dw_pcie_prog_outbound_atu() into a structure
(Yoshihiro Shimoda)
- Add support for endpoints to send Message TLPs, e.g., for INTx
emulation (Yoshihiro Shimoda)
TI DRA7xx PCIe controller driver:
- Rename .cpu_addr_fixup() parameter to reflect that it is a PCI
address, not a CPU address (Niklas Cassel)
TI Keystone PCIe controller driver:
- Validate IORESOURCE_BUS presence to avoid NULL pointer dereference
(Aleksandr Mishin)
- Work around AM65x/DRA80xM Errata #i2037 that corrupts TLPs and
causes processor hangs by limiting Max_Read_Request_Size (MRRS) and
Max_Payload_Size (MPS) (Kishon Vijay Abraham I)
- Leave BAR 0 disabled for AM654x to fix a regression caused by
|
||
|
Linus Torvalds
|
04d17331ca |
Merge tag 'usb-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB / Thunderbolt updates from Greg KH:
"Here is the big set of USB and Thunderbolt changes for 6.11-rc1.
Nothing earth-shattering in here, just constant forward progress in
adding support for new hardware and better debugging functionalities
for thunderbolt devices and the subsystem. Included in here are:
- thunderbolt debugging update and driver additions
- xhci driver updates
- typec driver updates
- kselftest device driver changes (acked by the relevant maintainers,
depended on other changes in this tree.)
- cdns3 driver updates
- gadget driver updates
- MODULE_DESCRIPTION() additions
- dwc3 driver updates and fixes
All of these have been in linux-next for a while with no reported
issues"
* tag 'usb-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (112 commits)
kselftest: devices: Add test to detect device error logs
kselftest: Move ksft helper module to common directory
kselftest: devices: Move discoverable devices test to subdirectory
usb: gadget: f_uac2: fix non-newline-terminated function name
USB: uas: Implement the new shutdown callback
USB: core: add 'shutdown' callback to usb_driver
usb: typec: Drop explicit initialization of struct i2c_device_id::driver_data to 0
usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller
usb: dwc2: add support for other Lantiq SoCs
usb: gadget: Use u16 types for 16-bit fields
usb: gadget: midi2: Fix incorrect default MIDI2 protocol setup
usb: dwc3: core: Check all ports when set phy suspend
usb: typec: tcpci: add support to set connector orientation
dt-bindings: usb: Convert fsl-usb to yaml
usb: typec: ucsi: reorder operations in ucsi_run_command()
usb: typec: ucsi: extract common code for command handling
usb: typec: ucsi: inline ucsi_read_message_in
usb: typec: ucsi: rework command execution functions
usb: typec: ucsi: split read operation
usb: typec: ucsi: simplify command sending API
...
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Linus Torvalds
|
aba9753c06 |
Merge tag 'tty-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty / serial updates from Greg KH: "Here is a small set of tty and serial driver updates for 6.11-rc1. Not much happened this cycle, unlike the previous kernel release which had lots of "excitement" in this part of the kernel. Included in here are the following changes: - dt binding updates for new platforms - 8250 driver updates - various small serial driver fixes and updates - printk/console naming and matching attempt #2 (was reverted for 6.10-final, should be good to go this time around, acked by the relevant maintainers). All of these have been in linux-next for a while with no reported issues" * tag 'tty-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (22 commits) Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports serial: core: Add serial_base_match_and_update_preferred_console() printk: Add match_devname_and_update_preferred_console() serial: sc16is7xx: hardware reset chip if reset-gpios is defined in DT dt-bindings: serial: sc16is7xx: add reset-gpios dt-bindings: serial: vt8500-uart: convert to json-schema serial: 8250_platform: Explicitly show we initialise ISA ports only once tty: add missing MODULE_DESCRIPTION() macros dt-bindings: serial: mediatek,uart: add MT7988 serial: sh-sci: Add support for RZ/V2H(P) SoC dt-bindings: serial: Add documentation for Renesas RZ/V2H(P) (R9A09G057) SCIF support dt-bindings: serial: renesas,scif: Make 'interrupt-names' property as required dt-bindings: serial: renesas,scif: Validate 'interrupts' and 'interrupt-names' dt-bindings: serial: renesas,scif: Move ref for serial.yaml at the end riscv: dts: starfive: jh7110: Add the core reset and jh7110 compatible for uarts serial: 8250_dw: Use reset array API to get resets dt-bindings: serial: snps-dw-apb-uart: Add one more reset signal for StarFive JH7110 SoC serial: 8250: Extract platform driver serial: 8250: Extract RSA bits serial: imx: stop casting struct uart_port to struct imx_port ... |
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Linus Torvalds
|
cf05e93af4 |
Merge tag 'docs-6.11' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet:
"Nothing hugely exciting happening in the documentation tree this time
around, mostly more of the usual:
- More Spanish, Italian, and Chinese translations
- A new script, scripts/checktransupdate.py, can be used to see which
commits have touched an (English) document since a given
translation was last updated.
- A couple of "best practices" suggestions (on Link: tags and
off-list discussions) that were not entirely at consensus level,
but I concluded they were close enough to accept.
- Some nice cleanups removing documentation for kernel parameters
that have not been recognized for ... a long time.
...along with the usual updates, typo fixes, and such"
* tag 'docs-6.11' of git://git.lwn.net/linux: (57 commits)
Documentation: Document user_events ioctl code
docs/pinctrl: fix typo in mapping example
docs: maintainer: discourage taking conversations off-list
docs: driver-model: platform: update the definition of platform_driver
docs/sp_SP: Add translation for scheduler/sched-design-CFS.rst
writing_musb_glue_layer.rst: Fix broken URL
zh_CN/admin-guide: one typo fix
docs/zh_CN/virt: Update the translation of guest-halt-polling.rst
Documentation: add reference from dynamic debug to loglevel kernel params
Documentation: best practices for using Link trailers
Documentation: fix links to mailing list services
Documentation: exception-tables.rst: Fix the wrong steps referenced
docs/zh_CN: add process/researcher-guidelines Chinese translation
Documentation/tools/rv: fix document header
docs/sp_SP: Add translation of process/maintainer-kvm-x86.rst
docs/admin-guide/mm: correct typo 'quired' to 'queried'
Add libps2 to the input section of driver-api
Docs/mm/index: move allocation profiling document to unsorted documents chapter
Docs/mm/index: rename 'Legacy Documentation' to 'Unsorted Documentation'
Docs/mm/index: Remove 'Memory Management Guide' chapter marker
...
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Linus Torvalds
|
b2fc97c186 |
Merge tag 'memblock-v6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
Pull memblock updates from Mike Rapoport: - 'reserve_mem' command line parameter to allow creation of named memory reservation at boot time. The driving use-case is to improve the ability of pstore to retain ramoops data across reboots. - cleanups and small improvements in memblock and mm_init - new tests cases in memblock test suite * tag 'memblock-v6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock: memblock tests: fix implicit declaration of function 'numa_valid_node' memblock: Move late alloc warning down to phys alloc pstore/ramoops: Add ramoops.mem_name= command line option mm/memblock: Add "reserve_mem" to reserved named memory at boot up mm/mm_init.c: don't initialize page->lru again mm/mm_init.c: not always search next deferred_init_pfn from very beginning mm/mm_init.c: use deferred_init_mem_pfn_range_in_zone() to decide loop condition mm/mm_init.c: get the highest zone directly mm/mm_init.c: move nr_initialised reset down a bit mm/memblock: fix a typo in description of for_each_mem_region() mm/mm_init.c: use memblock_region_memory_base_pfn() to get startpfn mm/memblock: use PAGE_ALIGN_DOWN to get pgend in free_memmap mm/memblock: return true directly on finding overlap region memblock tests: add memblock_overlaps_region_checks mm/memblock: fix comment for memblock_isolate_range() memblock tests: add memblock_reserve_many_may_conflict_check() memblock tests: add memblock_reserve_all_locations_check() mm/memblock: remove empty dummy entry |
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Linus Torvalds
|
4a996d90b9 |
Merge tag 'sched-core-2024-07-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar: - Update Daniel Bristot de Oliveira's entry in MAINTAINERS, and credit him in CREDITS - Harmonize the lock-yielding behavior on dynamically selected preemption models with static ones - Reorganize the code a bit: split out sched/syscalls.c to reduce the size of sched/core.c - Micro-optimize psi_group_change() - Fix set_load_weight() for SCHED_IDLE tasks - Misc cleanups & fixes * tag 'sched-core-2024-07-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched: Update MAINTAINERS and CREDITS sched/fair: set_load_weight() must also call reweight_task() for SCHED_IDLE tasks sched/psi: Optimise psi_group_change a bit sched/core: Drop spinlocks on contention iff kernel is preemptible sched/core: Move preempt_model_*() helpers from sched.h to preempt.h sched/balance: Skip unnecessary updates to idle load balancer's flags idle: Remove stale RCU comment sched/headers: Move struct pre-declarations to the beginning of the header sched/core: Clean up kernel/sched/sched.h a bit sched/core: Simplify prefetch_curr_exec_start() sched: Fix spelling in comments sched/syscalls: Split out kernel/sched/syscalls.c from kernel/sched/core.c |
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Linus Torvalds
|
f83e38fc9f |
Merge tag 'for-linus-6.11-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross: - some trivial cleanups - a fix for the Xen timer - add boot time selectable debug capability to the Xen multicall handling - two fixes for the recently added Xen irqfd handling * tag 'for-linus-6.11-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: x86/xen: remove deprecated xen_nopvspin boot parameter x86/xen: eliminate some private header files x86/xen: make some functions static xen: make multicall debug boot time selectable xen/arm: Convert comma to semicolon xen: privcmd: Fix possible access to a freed kirqfd instance xen: privcmd: Switch from mutex to spinlock for irqfds xen: add missing MODULE_DESCRIPTION() macros x86/xen: Convert comma to semicolon x86/xen/time: Reduce Xen timer tick xen/manage: Constify struct shutdown_handler |
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Linus Torvalds
|
e55037c879 |
Merge tag 'efi-next-for-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Pull EFI updates from Ard Biesheuvel:
"Note the removal of the EFI fake memory map support - this is believed
to be unused and no longer worth supporting. However, we could easily
bring it back if needed.
With recent developments regarding confidential VMs and unaccepted
memory, combined with kexec, creating a known inaccurate view of the
firmware's memory map and handing it to the OS is a feature we can
live without, hence the removal. Alternatively, I could imagine making
this feature mutually exclusive with those confidential VM related
features, but let's try simply removing it first.
Summary:
- Drop support for the 'fake' EFI memory map on x86
- Add an SMBIOS based tweak to the EFI stub instructing the firmware
on x86 Macbook Pros to keep both GPUs enabled
- Replace 0-sized array with flexible array in EFI memory attributes
table handling
- Drop redundant BSS clearing when booting via the native PE
entrypoint on x86
- Avoid returning EFI_SUCCESS when aborting on an out-of-memory
condition
- Cosmetic tweak for arm64 KASLR loading logic"
* tag 'efi-next-for-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
efi: Replace efi_memory_attributes_table_t 0-sized array with flexible array
efi: Rename efi_early_memdesc_ptr() to efi_memdesc_ptr()
arm64/efistub: Clean up KASLR logic
x86/efistub: Drop redundant clearing of BSS
x86/efistub: Avoid returning EFI_SUCCESS on error
x86/efistub: Call Apple set_os protocol on dual GPU Intel Macs
x86/efistub: Enable SMBIOS protocol handling for x86
efistub/smbios: Simplify SMBIOS enumeration API
x86/efi: Drop support for fake EFI memory maps
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Paolo Bonzini
|
1c5a0b55ab |
Merge tag 'kvmarm-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm64 changes for 6.11 - Initial infrastructure for shadow stage-2 MMUs, as part of nested virtualization enablement - Support for userspace changes to the guest CTR_EL0 value, enabling (in part) migration of VMs between heterogenous hardware - Fixes + improvements to pKVM's FF-A proxy, adding support for v1.1 of the protocol - FPSIMD/SVE support for nested, including merged trap configuration and exception routing - New command-line parameter to control the WFx trap behavior under KVM - Introduce kCFI hardening in the EL2 hypervisor - Fixes + cleanups for handling presence/absence of FEAT_TCRX - Miscellaneous fixes + documentation updates |
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Linus Torvalds
|
2439a5eaa7 |
Merge tag 'x86_bugs_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cpu mitigation updates from Borislav Petkov: - Add a spectre_bhi=vmexit mitigation option aimed at cloud environments - Remove duplicated Spectre cmdline option documentation - Add separate macro definitions for syscall handlers which do not return in order to address objtool warnings * tag 'x86_bugs_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/bugs: Add 'spectre_bhi=vmexit' cmdline option x86/bugs: Remove duplicate Spectre cmdline option descriptions x86/syscall: Mark exit[_group] syscall handlers __noreturn |
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Linus Torvalds
|
181a984b7d |
Merge tag 'x86_cleanups_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cleanups from Borislav Petkov: - Remove an unused function and the documentation of an already removed cmdline parameter * tag 'x86_cleanups_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/boot: Remove unused function __fortify_panic() Documentation: Remove "mfgpt_irq=" from the kernel-parameters.txt file |
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Linus Torvalds
|
c89d780cc1 |
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Catalin Marinas:
"The biggest part is the virtual CPU hotplug that touches ACPI,
irqchip. We also have some GICv3 optimisation for pseudo-NMIs that has
been queued via the arm64 tree. Otherwise the usual perf updates,
kselftest, various small cleanups.
Core:
- Virtual CPU hotplug support for arm64 ACPI systems
- cpufeature infrastructure cleanups and making the FEAT_ECBHB ID
bits visible to guests
- CPU errata: expand the speculative SSBS workaround to more CPUs
- GICv3, use compile-time PMR values: optimise the way regular IRQs
are masked/unmasked when GICv3 pseudo-NMIs are used, removing the
need for a static key in fast paths by using a priority value
chosen dynamically at boot time
ACPI:
- 'acpi=nospcr' option to disable SPCR as default console for arm64
- Move some ACPI code (cpuidle, FFH) to drivers/acpi/arm64/
Perf updates:
- Rework of the IMX PMU driver to enable support for I.MX95
- Enable support for tertiary match groups in the CMN PMU driver
- Initial refactoring of the CPU PMU code to prepare for the fixed
instruction counter introduced by Arm v9.4
- Add missing PMU driver MODULE_DESCRIPTION() strings
- Hook up DT compatibles for recent CPU PMUs
Kselftest updates:
- Kernel mode NEON fp-stress
- Cleanups, spelling mistakes
Miscellaneous:
- arm64 Documentation update with a minor clarification on TBI
- Fix missing IPI statistics
- Implement raw_smp_processor_id() using thread_info rather than a
per-CPU variable (better code generation)
- Make MTE checking of in-kernel asynchronous tag faults conditional
on KASAN being enabled
- Minor cleanups, typos"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (69 commits)
selftests: arm64: tags: remove the result script
selftests: arm64: tags_test: conform test to TAP output
perf: add missing MODULE_DESCRIPTION() macros
arm64: smp: Fix missing IPI statistics
irqchip/gic-v3: Fix 'broken_rdists' unused warning when !SMP and !ACPI
ACPI: Add acpi=nospcr to disable ACPI SPCR as default console on ARM64
Documentation: arm64: Update memory.rst for TBI
arm64/cpufeature: Replace custom macros with fields from ID_AA64PFR0_EL1
KVM: arm64: Replace custom macros with fields from ID_AA64PFR0_EL1
perf: arm_pmuv3: Include asm/arm_pmuv3.h from linux/perf/arm_pmuv3.h
perf: arm_v6/7_pmu: Drop non-DT probe support
perf/arm: Move 32-bit PMU drivers to drivers/perf/
perf: arm_pmuv3: Drop unnecessary IS_ENABLED(CONFIG_ARM64) check
perf: arm_pmuv3: Avoid assigning fixed cycle counter with threshold
arm64: Kconfig: Fix dependencies to enable ACPI_HOTPLUG_CPU
perf: imx_perf: add support for i.MX95 platform
perf: imx_perf: fix counter start and config sequence
perf: imx_perf: refactor driver for imx93
perf: imx_perf: let the driver manage the counter usage rather the user
perf: imx_perf: add macro definitions for parsing config attr
...
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Linus Torvalds
|
9855e87328 |
Merge tag 'rcu.2024.07.12a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull RCU updates from Paul McKenney: - Update Tasks RCU and Tasks Rude RCU description in Requirements.rst and clarify rcu_assign_pointer() and rcu_dereference() ordering properties - Add lockdep assertions for RCU readers, limit inline wakeups for callback-bypass synchronize_rcu(), add an rcutree.nohz_full_patience_delay to reduce nohz_full OS jitter, add Uladzislau Rezki as RCU maintainer, and fix a subtle callback-migration memory-ordering issue - Remove a number of redundant memory barriers - Remove unnecessary bypass-list lock-contention mitigation, use parking API instead of open-coded ad-hoc equivalent, and upgrade obsolete comments - Revert avoidance of a deadlock that can no longer occur and properly synchronize Tasks Trace RCU checking of runqueues - Add tests for handling of double-call_rcu() bug, add missing MODULE_DESCRIPTION, and add a script that histograms the number of calls to RCU updaters - Fill out SRCU polled-grace-period API * tag 'rcu.2024.07.12a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (29 commits) rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU invocation rcu: Eliminate lockless accesses to rcu_sync->gp_count MAINTAINERS: Add Uladzislau Rezki as RCU maintainer rcu: Add rcutree.nohz_full_patience_delay to reduce nohz_full OS jitter rcu/exp: Remove redundant full memory barrier at the end of GP rcu: Remove full memory barrier on RCU stall printout rcu: Remove full memory barrier on boot time eqs sanity check rcu/exp: Remove superfluous full memory barrier upon first EQS snapshot rcu: Remove superfluous full memory barrier upon first EQS snapshot rcu: Remove full ordering on second EQS snapshot srcu: Fill out polled grace-period APIs srcu: Update cleanup_srcu_struct() comment srcu: Add NUM_ACTIVE_SRCU_POLL_OLDSTATE srcu: Disable interrupts directly in srcu_gp_end() rcu: Disable interrupts directly in rcu_gp_init() rcu/tree: Reduce wake up for synchronize_rcu() common case rcu/tasks: Fix stale task snaphot for Tasks Trace tools/rcu: Add rcu-updaters.sh script rcutorture: Add missing MODULE_DESCRIPTION() macros rcutorture: Fix rcu_torture_fwd_cb_cr() data race ... |
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Vidya Sagar
|
47c8846a49 |
PCI: Extend ACS configurability
PCIe ACS settings control the level of isolation and the possible P2P paths between devices. With greater isolation the kernel will create smaller iommu_groups and with less isolation there is more HW that can achieve P2P transfers. From a virtualization perspective all devices in the same iommu_group must be assigned to the same VM as they lack security isolation. There is no way for the kernel to automatically know the correct ACS settings for any given system and workload. Existing command line options (e.g., disable_acs_redir) allow only for large scale change, disabling all isolation, but this is not sufficient for more complex cases. Add a kernel command-line option 'config_acs' to directly control all the ACS bits for specific devices, which allows the operator to setup the right level of isolation to achieve the desired P2P configuration. The definition is future proof; when new ACS bits are added to the spec the open syntax can be extended. ACS needs to be setup early in the kernel boot as the ACS settings affect how iommu_groups are formed. iommu_group formation is a one time event during initial device discovery, so changing ACS bits after kernel boot can result in an inaccurate view of the iommu_groups compared to the current isolation configuration. ACS applies to PCIe Downstream Ports and multi-function devices. The default ACS settings are strict and deny any direct traffic between two functions. This results in the smallest iommu_group the HW can support. Frequently these values result in slow or non-working P2PDMA. ACS offers a range of security choices controlling how traffic is allowed to go directly between two devices. Some popular choices: - Full prevention - Translated requests can be direct, with various options - Asymmetric direct traffic, A can reach B but not the reverse - All traffic can be direct Along with some other less common ones for special topologies. The intention is that this option would be used with expert knowledge of the HW capability and workload to achieve the desired configuration. Link: https://lore.kernel.org/r/20240625153150.159310-1-vidyas@nvidia.com Signed-off-by: Vidya Sagar <vidyas@nvidia.com> [bhelgaas: add example, tidy printk formats] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> |
||
Jiaxun Yang
|
59649de96f |
MIPS: Implement ieee754 NAN2008 emulation mode
Implement ieee754 NAN2008 emulation mode. When this mode is enabled, kernel will accept ELF file compiled for both NaN 2008 and NaN legacy, but if hardware does not have capability to match ELF's NaN mode, __own_fpu will fail for corresponding thread and fpuemu will then kick in. This mode trade performance for correctness, while maintaining support for both NaN mode regardless of hardware capability. It is useful for multilib installation that have both types of binary exist in system. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> |
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Juergen Gross
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9fe6a8c5b2 |
x86/xen: remove deprecated xen_nopvspin boot parameter
The xen_nopvspin boot parameter is deprecated since 2019. nopvspin can be used instead. Remove the xen_nopvspin boot parameter and replace the xen_pvspin variable use cases with nopvspin. This requires to move the nopvspin variable out of the .initdata section, as it needs to be accessed for cpuhotplug, too. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Message-ID: <20240710110139.22300-1-jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> |
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Juergen Gross
|
942d917cb9 |
xen: make multicall debug boot time selectable
Today Xen multicall debugging needs to be enabled via modifying a define in a source file for getting debug data of multicall errors encountered by users. Switch multicall debugging to depend on a boot parameter "xen_mc_debug" instead, enabling affected users to boot with the new parameter set in order to get better diagnostics. With debugging enabled print the following information in case at least one of the batched calls failed: - all calls of the batch with operation, result and caller - all parameters of each call - all parameters stored in the multicall data for each call Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Message-ID: <20240710092749.13595-1-jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> |
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Ingo Molnar
|
011b1134b8 |
Merge branch 'sched/urgent' into sched/core, to pick up fixes and refresh the branch
Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Bibo Mao
|
03779999ac |
LoongArch: KVM: Add PV steal time support in guest side
Per-cpu struct kvm_steal_time is added here, its size is 64 bytes and also defined as 64 bytes, so that the whole structure is in one physical page. When a VCPU is online, function pv_enable_steal_time() is called. This function will pass guest physical address of struct kvm_steal_time and tells hypervisor to enable steal time. When a vcpu is offline, physical address is set as 0 and tells hypervisor to disable steal time. Here is an output of vmstat on guest when there is workload on both host and guest. It shows steal time stat information. procs -----------memory---------- -----io---- -system-- ------cpu----- r b swpd free inact active bi bo in cs us sy id wa st 15 1 0 7583616 184112 72208 20 0 162 52 31 6 43 0 20 17 0 0 7583616 184704 72192 0 0 6318 6885 5 60 8 5 22 16 0 0 7583616 185392 72144 0 0 1766 1081 0 49 0 1 50 16 0 0 7583616 184816 72304 0 0 6300 6166 4 62 12 2 20 18 0 0 7583632 184480 72240 0 0 2814 1754 2 58 4 1 35 Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> |
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Paul E. McKenney
|
68d124b099 |
rcu: Add rcutree.nohz_full_patience_delay to reduce nohz_full OS jitter
If a CPU is running either a userspace application or a guest OS in nohz_full mode, it is possible for a system call to occur just as an RCU grace period is starting. If that CPU also has the scheduling-clock tick enabled for any reason (such as a second runnable task), and if the system was booted with rcutree.use_softirq=0, then RCU can add insult to injury by awakening that CPU's rcuc kthread, resulting in yet another task and yet more OS jitter due to switching to that task, running it, and switching back. In addition, in the common case where that system call is not of excessively long duration, awakening the rcuc task is pointless. This pointlessness is due to the fact that the CPU will enter an extended quiescent state upon returning to the userspace application or guest OS. In this case, the rcuc kthread cannot do anything that the main RCU grace-period kthread cannot do on its behalf, at least if it is given a few additional milliseconds (for example, given the time duration specified by rcutree.jiffies_till_first_fqs, give or take scheduling delays). This commit therefore adds a rcutree.nohz_full_patience_delay kernel boot parameter that specifies the grace period age (in milliseconds, rounded to jiffies) before which RCU will refrain from awakening the rcuc kthread. Preliminary experimentation suggests a value of 1000, that is, one second. Increasing rcutree.nohz_full_patience_delay will increase grace-period latency and in turn increase memory footprint, so systems with constrained memory might choose a smaller value. Systems with less-aggressive OS-jitter requirements might choose the default value of zero, which keeps the traditional immediate-wakeup behavior, thus avoiding increases in grace-period latency. [ paulmck: Apply Leonardo Bras feedback. ] Link: https://lore.kernel.org/all/20240328171949.743211-1-leobras@redhat.com/ Reported-by: Leonardo Bras <leobras@redhat.com> Suggested-by: Leonardo Bras <leobras@redhat.com> Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Leonardo Bras <leobras@redhat.com> |
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Liu Wei
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f5a4af3c75 |
ACPI: Add acpi=nospcr to disable ACPI SPCR as default console on ARM64
For varying privacy and security reasons, sometimes we would like to completely silence the _serial_ console, and only enable it when needed. But there are many existing systems that depend on this _serial_ console, so add acpi=nospcr to disable console in ACPI SPCR table as default _serial_ console. Signed-off-by: Liu Wei <liuwei09@cestc.cn> Suggested-by: Prarit Bhargava <prarit@redhat.com> Suggested-by: Will Deacon <will@kernel.org> Suggested-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Prarit Bhargava <prarit@redhat.com> Link: https://lore.kernel.org/r/20240625030504.58025-1-liuwei09@cestc.cn Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Tony Lindgren
|
17199dfccd |
Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports
Document the console option for DEVNAME:0.0 style addressing for serial ports. Suggested-by: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Dhruva Gole <d-gole@ti.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20240703100615.118762-4-tony.lindgren@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Shubhang Kaushik OS
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55ccad6fc1 |
vmalloc: modify the alloc_vmap_area() error message for better diagnostics
'vmap allocation for size %lu failed: use vmalloc=<size> to increase size' The above warning is seen in the kernel functionality for allocation of the restricted virtual memory range till exhaustion. This message is misleading because 'vmalloc=' is supported on arm32, x86 platforms and is not a valid kernel parameter on a number of other platforms (in particular its not supported on arm64, alpha, loongarch, arc, csky, hexagon, microblaze, mips, nios2, openrisc, parisc, m64k, powerpc, riscv, sh, um, xtensa, s390, sparc). With the update, the output gets modified to include the function parameters along with the start and end of the virtual memory range allowed. The warning message after fix on kernel version 6.10.0-rc1+: vmalloc_node_range for size 33619968 failed: Address range restricted between 0xffff800082640000 - 0xffff800084650000 Backtrace with the misleading error message: vmap allocation for size 33619968 failed: use vmalloc=<size> to increase size insmod: vmalloc error: size 33554432, vm_struct allocation failed, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0 CPU: 46 PID: 1977 Comm: insmod Tainted: G E 6.10.0-rc1+ #79 Hardware name: INGRASYS Yushan Server iSystem TEMP-S000141176+10/Yushan Motherboard, BIOS 2.10.20230517 (SCP: xxx) yyyy/mm/dd Call trace: dump_backtrace+0xa0/0x128 show_stack+0x20/0x38 dump_stack_lvl+0x78/0x90 dump_stack+0x18/0x28 warn_alloc+0x12c/0x1b8 __vmalloc_node_range_noprof+0x28c/0x7e0 custom_init+0xb4/0xfff8 [test_driver] do_one_initcall+0x60/0x290 do_init_module+0x68/0x250 load_module+0x236c/0x2428 init_module_from_file+0x8c/0xd8 __arm64_sys_finit_module+0x1b4/0x388 invoke_syscall+0x78/0x108 el0_svc_common.constprop.0+0x48/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x3c/0x130 el0t_64_sync_handler+0x100/0x130 el0t_64_sync+0x190/0x198 [Shubhang@os.amperecomputing.com: v5] Link: https://lkml.kernel.org/r/CH2PR01MB5894B0182EA0B28DF2EFB916F5C72@CH2PR01MB5894.prod.exchangelabs.com Link: https://lkml.kernel.org/r/MN2PR01MB59025CC02D1D29516527A693F5C62@MN2PR01MB5902.prod.exchangelabs.com Signed-off-by: Shubhang Kaushik <shubhang@os.amperecomputing.com> Reviewed-by: Christoph Lameter (Ampere) <cl@linux.com> Cc: Christoph Lameter <cl@linux.com> Cc: Guo Ren <guoren@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: Xiongwei Song <xiongwei.song@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ard Biesheuvel
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37aee82c21 |
x86/efi: Drop support for fake EFI memory maps
Between kexec and confidential VM support, handling the EFI memory maps correctly on x86 is already proving to be rather difficult (as opposed to other EFI architectures which manage to never modify the EFI memory map to begin with) EFI fake memory map support is essentially a development hack (for testing new support for the 'special purpose' and 'more reliable' EFI memory attributes) that leaked into production code. The regions marked in this manner are not actually recognized as such by the firmware itself or the EFI stub (and never have), and marking memory as 'more reliable' seems rather futile if the underlying memory is just ordinary RAM. Marking memory as 'special purpose' in this way is also dubious, but may be in use in production code nonetheless. However, the same should be achievable by using the memmap= command line option with the ! operator. EFI fake memmap support is not enabled by any of the major distros (Debian, Fedora, SUSE, Ubuntu) and does not exist on other architectures, so let's drop support for it. Acked-by: Borislav Petkov (AMD) <bp@alien8.de> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> |
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Greg Kroah-Hartman
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f7697db8b1 |
Merge 6.10-rc6 into usb-next
We need the USB fixes in here as well for some follow-on patches. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Linus Torvalds
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3e334486ec |
Merge tag 'tty-6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty / serial / console fixes from Greg KH:
"Here are a bunch of fixes/reverts for 6.10-rc6. Include in here are:
- revert the bunch of tty/serial/console changes that landed in -rc1
that didn't quite work properly yet.
Everyone agreed to just revert them for now and will work on making
them better for a future release instead of trying to quick fix the
existing changes this late in the release cycle
- 8250 driver port count bugfix
- Other tiny serial port bugfixes for reported issues
All of these have been in linux-next this week with no reported
issues"
* tag 'tty-6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
Revert "printk: Save console options for add_preferred_console_match()"
Revert "printk: Don't try to parse DEVNAME:0.0 console options"
Revert "printk: Flag register_console() if console is set on command line"
Revert "serial: core: Add support for DEVNAME:0.0 style naming for kernel console"
Revert "serial: core: Handle serial console options"
Revert "serial: 8250: Add preferred console in serial8250_isa_init_ports()"
Revert "Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports"
Revert "serial: 8250: Fix add preferred console for serial8250_isa_init_ports()"
Revert "serial: core: Fix ifdef for serial base console functions"
serial: bcm63xx-uart: fix tx after conversion to uart_port_tx_limited()
serial: core: introduce uart_port_tx_limited_flags()
Revert "serial: core: only stop transmit when HW fifo is empty"
serial: imx: set receiver level before starting uart
tty: mcf: MCF54418 has 10 UARTS
serial: 8250_omap: Implementation of Errata i2310
tty: serial: 8250: Fix port count mismatch with the device
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Josh Poimboeuf
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42c141fbb6 |
x86/bugs: Add 'spectre_bhi=vmexit' cmdline option
In cloud environments it can be useful to *only* enable the vmexit
mitigation and leave syscalls vulnerable. Add that as an option.
This is similar to the old spectre_bhi=auto option which was removed
with the following commit:
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Thomas Huth
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661404644d |
Documentation: Remove IA-64 from kernel-parameters
IA-64 has been removed from the tree, so we should also remove the corresponding kernel-parameters documentation now. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20240627162458.387700-1-thuth@redhat.com |
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Greg Kroah-Hartman
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12b7210ea8 |
Revert "Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports"
This reverts commit
|
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Steven Rostedt (Google)
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1e4c64b71c |
mm/memblock: Add "reserve_mem" to reserved named memory at boot up
In order to allow for requesting a memory region that can be used for
things like pstore on multiple machines where the memory layout is not the
same, add a new option to the kernel command line called "reserve_mem".
The format is: reserve_mem=nn:align:name
Where it will find nn amount of memory at the given alignment of align.
The name field is to allow another subsystem to retrieve where the memory
was found. For example:
reserve_mem=12M:4096:oops ramoops.mem_name=oops
Where ramoops.mem_name will tell ramoops that memory was reserved for it
via the reserve_mem option and it can find it by calling:
if (reserve_mem_find_by_name("oops", &start, &size)) {
// start holds the start address and size holds the size given
This is typically used for systems that do not wipe the RAM, and this
command line will try to reserve the same physical memory on soft reboots.
Note, it is not guaranteed to be the same location. For example, if KASLR
places the kernel at the location of where the RAM reservation was from a
previous boot, the new reservation will be at a different location. Any
subsystem using this feature must add a way to verify that the contents of
the physical memory is from a previous boot, as there may be cases where
the memory will not be located at the same location.
Not all systems may work either. There could be bit flips if the reboot
goes through the BIOS. Using kexec to reboot the machine is likely to
have better results in such cases.
Link: https://lore.kernel.org/all/ZjJVnZUX3NZiGW6q@kernel.org/
Suggested-by: Mike Rapoport <rppt@kernel.org>
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20240613155527.437020271@goodmis.org
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
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Thomas Huth
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166d6019f9 |
Documentation: Remove the unused "tp720" from kernel-parameters.txt
The "tp720" switch once belonged to the ps2esdi driver, but this
driver has been removed a long time ago in 2008 in the commit
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Thomas Huth
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9b8b80b9f6 |
Documentation: Remove the unused "topology_updates" from kernel-parameters.txt
The "topology_updates" switch has been removed four years ago in commit
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Thomas Huth
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69bce7f3dc |
Documentation: Remove unused "nps_mtm_hs_ctr" from kernel-parameters.txt
The "nps_mtm_hs_ctr" parameter has been removed in commit
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Thomas Huth
|
f730144162 |
Documentation: Remove unused "spia_*" kernel parameters
The kernel module parameters "spia_io_base", "spia_fio_base",
"spia_pedr" and "spia_peddr" have been removed via commit
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Thomas Huth
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f891e73f96 |
Documentation: Remove unused "mtdset=" from kernel-parameters.txt
The kernel parameter "mtdset" has been removed two years ago in
commit
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Thomas Huth
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35a9cbeefd |
Documentation: Remove the "rhash_entries=" from kernel-parameters.txt
"rhash_entries" belonged to the routing cache that has been removed in
commit
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Thomas Huth
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2626f066f8 |
Documentation: Remove "ltpc=" from the kernel-parameters.txt
The string "ltpc" cannot be found in the source code anymore. This
kernel parameter likely belonged to the LocalTalk PC card module
which has been removed in commit
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Thomas Huth
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6bb955d4fb |
Documentation: Add "S390" to the swiotlb kernel parameter
The "swiotlb" kernel parameter is used on s390 for protected virt since
commit
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David Hildenbrand
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384a746bb5 |
Revert "mm: init_mlocked_on_free_v3"
There was insufficient review and no agreement that this is the right
approach.
There are serious flaws with the implementation that make processes using
mlock() not even work with simple fork() [1] and we get reliable crashes
when rebooting.
Further, simply because we might be unmapping a single PTE of a large
mlocked folio, we shouldn't zero out the whole folio.
... especially because the code can also *corrupt* urelated memory because
kernel_init_pages(page, folio_nr_pages(folio));
Could end up writing outside of the actual folio if we work with a tail
page.
Let's revert it. Once there is agreement that this is the right approach,
the issues were fixed and there was reasonable review and proper testing,
we can consider it again.
[1] https://lkml.kernel.org/r/4da9da2f-73e4-45fd-b62f-a8a513314057@redhat.com
Link: https://lkml.kernel.org/r/20240605091710.38961-1-david@redhat.com
Fixes:
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Colton Lewis
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0b5afe0537 |
KVM: arm64: Add early_param to control WFx trapping
Add an early_params to control WFI and WFE trapping. This is to control the degree guests can wait for interrupts on their own without being trapped by KVM. Options for each param are trap and notrap. trap enables the trap. notrap disables the trap. Note that when enabled, traps are allowed but not guaranteed by the CPU architecture. Absent an explicitly set policy, default to current behavior: disabling the trap if only a single task is running and enabling otherwise. Signed-off-by: Colton Lewis <coltonlewis@google.com> Reviewed-by: Jing Zhang <jingzhangos@google.com> Link: https://lore.kernel.org/r/20240523174056.1565133-1-coltonlewis@google.com [ oliver: rework kvm_vcpu_should_clear_tw*() for readability ] Signed-off-by: Oliver Upton <oliver.upton@linux.dev> |
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Thomas Huth
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9b9eec8dc2 |
Documentation: Remove "mfgpt_irq=" from the kernel-parameters.txt file
The kernel parameter mfgpt_irq has been removed in 2009 already by
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Jinjie Ruan
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99a021edde |
Documentation: kernel-parameters: Add RISCV for nohlt
Since commit |
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Sean Christopherson
|
c793a62823 |
sched/core: Drop spinlocks on contention iff kernel is preemptible
Use preempt_model_preemptible() to detect a preemptible kernel when
deciding whether or not to reschedule in order to drop a contended
spinlock or rwlock. Because PREEMPT_DYNAMIC selects PREEMPTION, kernels
built with PREEMPT_DYNAMIC=y will yield contended locks even if the live
preemption model is "none" or "voluntary". In short, make kernels with
dynamically selected models behave the same as kernels with statically
selected models.
Somewhat counter-intuitively, NOT yielding a lock can provide better
latency for the relevant tasks/processes. E.g. KVM x86's mmu_lock, a
rwlock, is often contended between an invalidation event (takes mmu_lock
for write) and a vCPU servicing a guest page fault (takes mmu_lock for
read). For _some_ setups, letting the invalidation task complete even
if there is mmu_lock contention provides lower latency for *all* tasks,
i.e. the invalidation completes sooner *and* the vCPU services the guest
page fault sooner.
But even KVM's mmu_lock behavior isn't uniform, e.g. the "best" behavior
can vary depending on the host VMM, the guest workload, the number of
vCPUs, the number of pCPUs in the host, why there is lock contention, etc.
In other words, simply deleting the CONFIG_PREEMPTION guard (or doing the
opposite and removing contention yielding entirely) needs to come with a
big pile of data proving that changing the status quo is a net positive.
Opportunistically document this side effect of preempt=full, as yielding
contended spinlocks can have significant, user-visible impact.
Fixes:
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