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v0.5.1
https://github.com/torvalds/linux
02 December 2023, 22:23:51 UTC
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 
x86, hotplug: Serialize CPU hotplug to avoid bringup concurrency issues
 
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
History
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
Tip revision: d7c53c9
File Mode Size
.gitignore -rw-r--r-- 151 bytes
Kconfig -rw-r--r-- 4.8 KB
Makefile -rw-r--r-- 2.2 KB
gen_init_cpio.c -rw-r--r-- 12.3 KB
initramfs_data.S -rw-r--r-- 1021 bytes
initramfs_data.bz2.S -rw-r--r-- 1.0 KB
initramfs_data.gz.S -rw-r--r-- 1023 bytes
initramfs_data.lzma.S -rw-r--r-- 1.0 KB
initramfs_data.lzo.S -rw-r--r-- 1.0 KB
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