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authorHuang Ying <ying.huang@intel.com>2009-06-15 15:37:07 +0800
committerH. Peter Anvin <hpa@zytor.com>2009-06-16 16:56:04 -0700
commit184e1fdfea066ab8f12a1e8912f402d2d6556d11 (patch)
treef9ffff79d1924f530e582a2aab9f0cb032f0a4e3 /arch/x86/kernel/i8253.c
parent300df7dc89cc276377fc020704e34875d5c473b6 (diff)
x86, mce: fix a race condition about mce_callin and no_way_out
If one CPU has no_way_out == 1, all other CPUs should have no_way_out == 1. But despite global_nwo is read after mce_callin, global_nwo is updated after mce_callin too. So it is possible that some CPU read global_nwo before some other CPU update global_nwo, so that no_way_out == 1 for some CPU, while no_way_out == 0 for some other CPU. This patch fixes this race condition via moving mce_callin updating after global_nwo updating, with a smp_wmb in between. A smp_rmb is added between their reading too. Signed-off-by: Huang Ying <ying.huang@intel.com> Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Diffstat (limited to 'arch/x86/kernel/i8253.c')
0 files changed, 0 insertions, 0 deletions