diff options
| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2011-11-10 13:43:05 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-11-10 16:21:01 +0100 |
| commit | 064a59b6dd1f341cc478c212bb436e3da9cb8d04 (patch) | |
| tree | 44a5075e6b913493391911a57ebbe3cc6a25c26e /arch/x86/include | |
| parent | 0a9153261d54c432bc0bdc88607f24c835ac729c (diff) | |
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')
| -rw-r--r-- | arch/x86/include/asm/mach_traps.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/x86_init.h | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/include/asm/mach_traps.h b/arch/x86/include/asm/mach_traps.h index 72a8b52e7df..a01e7ec7d23 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); } diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h index f864fbe474c..1971e652d24 100644 --- a/arch/x86/include/asm/x86_init.h +++ b/arch/x86/include/asm/x86_init.h @@ -167,6 +167,7 @@ struct x86_platform_ops { void (*iommu_shutdown)(void); bool (*is_untracked_pat_range)(u64 start, u64 end); void (*nmi_init)(void); + unsigned char (*get_nmi_reason)(void); int (*i8042_detect)(void); }; |