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ef41df4344
Impact: bugfix
Considering the situation as follow:
before: mcelog.next == 1, mcelog.entry[0].finished = 1
+--------------------------------------------------------------------------
R W1 W2 W3
read mcelog.next (1)
mcelog.next++ (2)
(working on entry 1,
finished == 0)
mcelog.next = 0
mcelog.next++ (1)
(working on entry 0)
mcelog.next++ (2)
(working on entry 1)
<----------------- race ---------------->
(done on entry 1,
finished = 1)
(done on entry 1,
finished = 1)
To fix the race condition, a cmpxchg loop is added to mce_read() to
ensure no new MCE record can be added between mcelog.next reading and
mcelog.next = 0.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
|
||
|---|---|---|
| .. | ||
| k7.c | ||
| Makefile | ||
| mce_32.c | ||
| mce_64.c | ||
| mce_amd_64.c | ||
| mce_intel_64.c | ||
| mce.h | ||
| non-fatal.c | ||
| p4.c | ||
| p5.c | ||
| p6.c | ||
| therm_throt.c | ||
| winchip.c | ||