5819e464a1
The CPU enabled mask instead of the CPU possible mask should be used
by set_cpu_enabled(). Otherwise, we run into crash due to write to
the read-only CPU possible mask when vCPU is hot added on ARM64.
(qemu) device_add host-arm-cpu,id=cpu1,socket-id=1
Unable to handle kernel write to read-only memory at virtual address ffff800080fa7190
:
Call trace:
register_cpu+0x1a4/0x2e8
arch_register_cpu+0x84/0xd8
acpi_processor_add+0x480/0x5b0
acpi_bus_attach+0x1c4/0x300
acpi_dev_for_one_check+0x3c/0x50
device_for_each_child+0x68/0xc8
acpi_dev_for_each_child+0x48/0x80
acpi_bus_attach+0x84/0x300
acpi_bus_scan+0x74/0x220
acpi_scan_rescan_bus+0x54/0x88
acpi_device_hotplug+0x208/0x478
acpi_hotplug_work_fn+0x2c/0x50
process_one_work+0x15c/0x3c0
worker_thread+0x2ec/0x400
kthread+0x120/0x130
ret_from_fork+0x10/0x20
Fix it by passing the CPU enabled mask instead of the CPU possible
mask to set_cpu_enabled().
Fixes: 51c4767503 ("Merge tag 'bitmap-6.11-rc1' of https://github.com:/norov/linux")
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.