[PATCH] x86-64: Handle 32 bit PerfMon Counter writes cleanly in x86_64 nmi_watchdog

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P6 CPUs and Core/Core 2 CPUs which has 'architectural perf mon' feature,
only supports write of low 32 bits in Performance Monitoring Counters.
Bits 32..39 are sign extended based on bit 31 and bits 40..63 are reserved
and should be zero.

This patch:

Change x86_64 nmi handler to handle this case cleanly.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>

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Venkatesh Pallipadi 2007-02-13 13:26:22 +01:00 • committed by Andi Kleen

parent 4c3cbf75b2

commit 1676193937

1 changed files with 32 additions and 14 deletions

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arch/x86_64/kernel/nmi.c

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