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authorBorislav Petkov <bp@amd64.org>2010-08-19 20:10:29 +0200
committerH. Peter Anvin <hpa@linux.intel.com>2010-08-19 14:47:43 -0700
commitd7c53c9e822a4fefa13a0cae76f3190bfd0d5c11 (patch)
tree9f4910ad6e95470bb67f504a09b096a4c2822a8d /arch/x86/Kconfig
parent8848a91068c018bc91f597038a0f41462a0f88a4 (diff)
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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>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a84fc34c8f7..ac7827fc082 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -245,6 +245,11 @@ config ARCH_HWEIGHT_CFLAGS
config KTIME_SCALAR
def_bool X86_32
+
+config ARCH_CPU_PROBE_RELEASE
+ def_bool y
+ depends on HOTPLUG_CPU
+
source "init/Kconfig"
source "kernel/Kconfig.freezer"