https://github.com/torvalds/linux
Revision d7c53c9e822a4fefa13a0cae76f3190bfd0d5c11 authored by Borislav Petkov on 19 August 2010, 18:10:29 UTC, committed by H. Peter Anvin on 19 August 2010, 21:47:43 UTC
When testing cpu hotplug code on 32-bit we kept hitting the "CPU%d: Stuck ??" message due to multiple cores concurrently accessing the cpu_callin_mask, among others. Since these codepaths are not protected from concurrent access due to the fact that there's no sane reason for making an already complex code unnecessarily more complex - we hit the issue only when insanely switching cores off- and online - serialize hotplugging cores on the sysfs level and be done with it. [ v2.1: fix !HOTPLUG_CPU build ] Cc: <stable@kernel.org> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> LKML-Reference: <20100819181029.GC17171@aftab> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
1 parent 8848a91
Tip revision: d7c53c9e822a4fefa13a0cae76f3190bfd0d5c11 authored by Borislav Petkov on 19 August 2010, 18:10:29 UTC
x86, hotplug: Serialize CPU hotplug to avoid bringup concurrency issues
x86, hotplug: Serialize CPU hotplug to avoid bringup concurrency issues
Tip revision: d7c53c9
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