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| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2011-11-10 14:43:05 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-11-10 16:21:01 +0100 |
| commit | 064a59b6dd1f341cc478c212bb436e3da9cb8d04 (patch) | |
| tree | 44a5075e6b913493391911a57ebbe3cc6a25c26e /arch/x86/include/asm/mach_traps.h | |
| parent | x86/mrst: Add support for Penwell clock calibration (diff) | |
| download | linux-064a59b6dd1f341cc478c212bb436e3da9cb8d04.tar.xz linux-064a59b6dd1f341cc478c212bb436e3da9cb8d04.zip | |
x86/mrst: Avoid reporting wrong nmi status
Moorestown/Medfield platform does not have port 0x61 to report
NMI status, nor does it have external NMI sources. The only NMI
sources are from lapic, as results of perf counter overflow or
IPI, e.g. NMI watchdog or spin lock debug.
Reading port 0x61 on Moorestown will return 0xff which misled
NMI handlers to false critical errors such memory parity error.
The subsequent ioport access for NMI handling can also cause
undefined behavior on Moorestown.
This patch allows kernel process NMI due to watchdog or backrace
dump without unnecessary hangs.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[hand applied]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/mach_traps.h')
| -rw-r--r-- | arch/x86/include/asm/mach_traps.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/mach_traps.h b/arch/x86/include/asm/mach_traps.h index 72a8b52e7dfd..a01e7ec7d237 100644 --- a/arch/x86/include/asm/mach_traps.h +++ b/arch/x86/include/asm/mach_traps.h @@ -17,7 +17,7 @@ #define NMI_REASON_CLEAR_IOCHK 0x08 #define NMI_REASON_CLEAR_MASK 0x0f -static inline unsigned char get_nmi_reason(void) +static inline unsigned char default_get_nmi_reason(void) { return inb(NMI_REASON_PORT); } |