diff options
| author | Sage Weil <[email protected]> | 2013-08-15 11:11:45 -0700 |
|---|---|---|
| committer | Sage Weil <[email protected]> | 2013-08-15 11:11:45 -0700 |
| commit | ee3e542fec6e69bc9fb668698889a37d93950ddf (patch) | |
| tree | e74ee766a4764769ef1d3d45d266b4dea64101d3 /arch/x86/kernel/cpu/mcheck/mce_intel.c | |
| parent | fe2a801b50c0bb8039d627e5ae1fec249d10ff39 (diff) | |
| parent | f1d6e17f540af37bb1891480143669ba7636c4cf (diff) | |
Merge remote-tracking branch 'linus/master' into testing
Diffstat (limited to 'arch/x86/kernel/cpu/mcheck/mce_intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce_intel.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c index ae1697c2afe3..d56405309dc1 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_intel.c +++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c @@ -24,6 +24,18 @@ * Also supports reliable discovery of shared banks. */ +/* + * CMCI can be delivered to multiple cpus that share a machine check bank + * so we need to designate a single cpu to process errors logged in each bank + * in the interrupt handler (otherwise we would have many races and potential + * double reporting of the same error). + * Note that this can change when a cpu is offlined or brought online since + * some MCA banks are shared across cpus. When a cpu is offlined, cmci_clear() + * disables CMCI on all banks owned by the cpu and clears this bitfield. At + * this point, cmci_rediscover() kicks in and a different cpu may end up + * taking ownership of some of the shared MCA banks that were previously + * owned by the offlined cpu. + */ static DEFINE_PER_CPU(mce_banks_t, mce_banks_owned); /* |