Messages in this thread | | | From | Toshi Kani <> | Subject | [PATCH 0/2] Protect cpu map updates from ACPI processor | Date | Mon, 12 Aug 2013 09:45:52 -0600 |
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CPU system maps are protected with reader/writer locks. The reader lock, put_online_cpus(), assures that the maps are not updated while holding the lock. The writer lock, cpu_hotplug_begin(), is used to udpate the cpu maps along with cpu_maps_update_begin().
However, the ACPI processor handler updates the cpu maps without holding the the writer lock. This patchset fixes this problem.
--- The patchset is based on linux-next of the pm tree.
--- Toshi Kani (2): CPU hotplug: Export cpu_hotplug_begin() interface ACPI: Acquire writer lock to update cpu maps
--- drivers/acpi/acpi_processor.c | 21 ++++++++++++++++----- include/linux/cpu.h | 2 ++ kernel/cpu.c | 4 ++-- 3 files changed, 20 insertions(+), 7 deletions(-)
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