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authorJacob Pan <jacob.jun.pan@linux.intel.com>2011-11-10 13:43:05 +0000
committerIngo Molnar <mingo@elte.hu>2011-11-10 16:21:01 +0100
commit064a59b6dd1f341cc478c212bb436e3da9cb8d04 (patch)
tree44a5075e6b913493391911a57ebbe3cc6a25c26e /arch/x86/include/asm/x86_init.h
parent0a9153261d54c432bc0bdc88607f24c835ac729c (diff)
downloadop-kernel-dev-064a59b6dd1f341cc478c212bb436e3da9cb8d04.zip
op-kernel-dev-064a59b6dd1f341cc478c212bb436e3da9cb8d04.tar.gz
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/x86_init.h')
-rw-r--r--arch/x86/include/asm/x86_init.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index f864fbe..1971e65 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);
};
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