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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
