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881ec9d209d5371c21db89ca1bb19afd3fcadab3
linux/kernel
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Paul E. McKenney 881ec9d209 srcu: Eliminate possibility of destructive counter overflow 
Earlier versions of Tree SRCU were subject to a counter overflow bug that
could theoretically result in too-short grace periods.  This commit
eliminates this problem by adding an update-side memory barrier.
The short explanation is that if the updater sums the unlock counts
too late to see a given __srcu_read_unlock() increment, that CPU's
next __srcu_read_lock() must see the new value of ->srcu_idx, thus
incrementing the other bank of counters.  This eliminates the possibility
of destructive counter overflow as long as the srcu_read_lock() nesting
level does not exceed floor(ULONG_MAX/NR_CPUS/2), which should be an
eminently reasonable nesting limit, especially on 64-bit systems.

Reported-by: Lance Roy <ldr709@gmail.com>
Suggested-by: Lance Roy <ldr709@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2017-06-08 08:25:23 -07:00
..
bpf
bpf: fix wrong exposure of map_flags into fdinfo for lpm
2017-05-25 13:44:28 -04:00
cgroup
Merge branch 'for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2017-05-01 13:52:24 -07:00
configs
config: android-base: enable hardened usercopy and kernel ASLR
2017-02-27 18:43:46 -08:00
debug
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
events
perf/callchain: Force USER_DS when invoking perf_callchain_user()
2017-05-10 07:54:00 +02:00
gcov
gcov: support GCC 7.1
2017-05-12 15:57:15 -07:00
irq
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-21 11:45:26 -07:00
livepatch
livepatch: Make livepatch dependent on !TRIM_UNUSED_KSYMS
2017-05-27 00:27:37 +02:00
locking
futex,rt_mutex: Fix rt_mutex_cleanup_proxy_lock()
2017-05-22 21:57:18 +02:00
power
Merge branches 'pm-sleep' and 'powercap'
2017-05-22 20:32:05 +02:00
printk
Merge tag 'tty-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
2017-05-08 18:49:23 -07:00
rcu
srcu: Eliminate possibility of destructive counter overflow
2017-06-08 08:25:23 -07:00
sched
Merge branches 'intel_pstate', 'pm-cpufreq' and 'pm-cpufreq-sched'
2017-05-22 20:28:22 +02:00
time
posix-timers: Make signal printks conditional
2017-05-23 23:39:57 +02:00
trace
ftrace: Fix memory leak in ftrace_graph_release()
2017-05-26 22:35:48 -04:00
.gitignore
…
acct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
async.c
…
audit_fsnotify.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_tree.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_watch.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit.c
Merge branch 'stable-4.12' of git://git.infradead.org/users/pcmoore/audit
2017-05-03 09:21:59 -07:00
audit.h
audit: Use timespec64 to represent audit timestamps
2017-05-02 10:16:05 -04:00
auditfilter.c
audit: kernel generated netlink traffic should have a portid of 0
2017-05-02 10:16:05 -04:00
auditsc.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
backtracetest.c
…
bounds.c
…
capability.c
capability: export has_capability
2017-01-12 07:01:56 -07:00
compat.c
time: Change k_clock nsleep() to use timespec64
2017-04-14 21:49:56 +02:00
configs.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
context_tracking.c
…
cpu_pm.c
…
cpu.c
Merge branch 'linus' into locking/core, to pick up fixes
2017-04-14 10:29:40 +02:00
crash_core.c
ia64: reuse append_elf_note() and final_note() functions
2017-05-08 17:15:11 -07:00
crash_dump.c
…
cred.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/coredump.h>
2017-03-02 08:42:28 +01:00
delayacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
userfaultfd: non-cooperative: rollback userfaultfd_exit
2017-03-09 17:01:09 -08:00
extable.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-02-22 10:15:09 -08:00
fork.c
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-27 08:52:27 -07:00
freezer.c
freezer, oom: check TIF_MEMDIE on the correct task
2016-07-28 16:07:41 -07:00
futex_compat.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
futex.c
futex: Clarify mark_wake_futex memory barrier usage
2017-04-15 16:03:46 +02:00
groups.c
mm, vmalloc: use __GFP_HIGHMEM implicitly
2017-05-08 17:15:13 -07:00
hung_task.c
kernel/hung_task.c: defer showing held locks
2017-05-08 17:15:10 -07:00
irq_work.c
…
jump_label.c
Merge tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2017-02-27 13:26:17 -08:00
kallsyms.c
bpf: make jited programs visible in traces
2017-02-17 13:40:05 -05:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES
2016-10-25 11:31:51 +02:00
Kconfig.preempt
…
kcov.c
kcov: simplify interrupt check
2017-05-08 17:15:12 -07:00
kexec_core.c
ia64: reuse append_elf_note() and final_note() functions
2017-05-08 17:15:11 -07:00
kexec_file.c
kexec, x86/purgatory: Unbreak it and clean it up
2017-03-10 20:55:09 +01:00
kexec_internal.h
kexec, x86/purgatory: Unbreak it and clean it up
2017-03-10 20:55:09 +01:00
kexec.c
kexec: allow architectures to override boot mapping
2016-08-02 19:35:27 -04:00
kmod.c
sched/headers, vfs/execve: Prepare to move the do_execve*() prototypes from <linux/sched.h> to <linux/binfmts.h>
2017-03-02 08:42:39 +01:00
kprobes.c
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
2017-05-26 22:37:00 -04:00
ksysfs.c
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
2017-05-08 17:15:11 -07:00
kthread.c
cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups
2017-03-17 10:18:47 -04:00
latencytop.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
Makefile
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
2017-05-08 17:15:11 -07:00
membarrier.c
Fix: Disable sys_membarrier when nohz_full is enabled
2017-01-23 11:32:16 -08:00
memremap.c
mm, zone_device: Replace {get, put}_zone_device_page() with a single reference to fix pmem crash
2017-05-01 09:15:53 +02:00
module_signing.c
…
module-internal.h
…
module.c
kernel/module.c: use set_memory.h header
2017-05-08 17:15:14 -07:00
notifier.c
kernel/notifier.c: simplify expression
2017-02-24 17:46:56 -08:00
nsproxy.c
perf: Add PERF_RECORD_NAMESPACES to include namespaces related info
2017-03-13 15:57:41 -03:00
padata.c
padata: get_next is never NULL
2017-04-21 20:30:46 +08:00
panic.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
params.c
boot/param: Move next_arg() function to lib/cmdline.c for later reuse
2017-04-18 10:37:13 +02:00
pid_namespace.c
pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes
2017-05-13 17:26:01 -05:00
pid.c
pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()
2017-05-08 17:15:12 -07:00
profile.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
ptrace.c
ptrace: Properly initialize ptracer_cred on fork
2017-05-23 07:40:44 -05:00
range.c
…
reboot.c
…
relay.c
Merge branch 'work.splice' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-05-02 11:38:06 -07:00
resource.c
…
seccomp.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>
2017-03-02 08:42:36 +01:00
signal.c
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-10 10:30:46 -07:00
smp.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/idle.h>
2017-03-02 08:42:26 +01:00
smpboot.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
smpboot.h
…
softirq.c
sched/core: Remove 'task' parameter and rename tsk_restore_flags() to current_restore_flags()
2017-04-11 09:06:32 +02:00
stacktrace.c
stacktrace/x86: add function for detecting reliable stack traces
2017-03-08 09:18:02 +01:00
stop_machine.c
locking/core, stop_machine: Yield the CPU during stop machine()
2016-11-16 10:15:09 +01:00
sys_ni.c
move aio compat to fs/aio.c
2016-12-22 22:58:37 -05:00
sys.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2017-05-05 11:08:43 -07:00
sysctl_binary.c
net: Remove NET_CORE_BUDGET_USECS from sysctl binary interface.
2017-04-21 15:59:52 -04:00
sysctl.c
proc/sysctl: fix the int overflow for jiffies conversion
2017-05-08 17:15:10 -07:00
task_work.c
task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works
2016-08-02 19:35:02 -04:00
taskstats.c
taskstats: add e/u/stime for TGID command
2017-05-08 17:15:12 -07:00
test_kprobes.c
…
torture.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>
2017-03-02 08:42:27 +01:00
tracepoint.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
tsacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
ucount.c
ucount: Remove the atomicity from ucount->count
2017-03-06 15:26:37 -06:00
uid16.c
sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>
2017-03-02 08:42:31 +01:00
up.c
smp: Add function to execute a function synchronously on a CPU
2016-09-05 13:52:39 +02:00
user_namespace.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>
2017-03-02 08:42:29 +01:00
user-return-notifier.c
…
user.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/user.h>
2017-03-02 08:42:29 +01:00
utsname_sysctl.c
sched/headers: Remove <linux/rwsem.h> from <linux/sched.h>
2017-03-03 01:45:36 +01:00
utsname.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
watchdog_hld.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
watchdog.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
workqueue_internal.h
…
workqueue.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-01 19:12:53 -07:00