linux-kernel - [Patch V1 1/3] x86, mce: MCE log size not enough for high core parts

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Date:	Thu, 24 Sep 2015 01:48:38 -0400
From:	Ashok Raj <ashok.raj@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ashok Raj <ashok.raj@...el.com>, Boris Petkov <bp@...e.de>,
	linux-edac@...r.kernel.org, Tony Luck <tony.luck@...el.com>
Subject: [Patch V1 1/3] x86, mce: MCE log size not enough for high core parts

MCE_LOG_LEN appears to be short for high core count parts. Especially when
handling fatal errors, we don't clear MCE banks. Socket level MC banks
are visible to all CPUs that share banks.

Assuming 18 core part, 2 threads per core 2 banks per thread and couple uncore
MSRs. Rounding to 128 with some fudge to grow in future.

Signed-off-by: Ashok Raj <ashok.raj@...el.com>
Suggested-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/include/asm/mce.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 2dbc0bf..4293ae7 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -88,7 +88,7 @@
 #define MCE_EXTENDED_BANK	128
 #define MCE_THERMAL_BANK	(MCE_EXTENDED_BANK + 0)
 
-#define MCE_LOG_LEN 32
+#define MCE_LOG_LEN 		128
 #define MCE_LOG_SIGNATURE	"MACHINECHECK"
 
 /*
-- 
2.4.3

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