perf_counter, x86: return raw count with x86_perf_counter_update()

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To check on AMD cpus if a counter overflows, the upper bit of the raw
counter value must be checked. This value is already internally
available in x86_perf_counter_update(). Now, the value is returned so
that it can be used directly to check for overflows.

[ Impact: micro-optimization ]

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1241002046-8832-26-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Robert Richter 2009-04-29 12:47:22 +02:00 • committed by Ingo Molnar

parent a29aa8a7ff

commit 4b7bfd0d27

1 changed files with 4 additions and 3 deletions

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arch/x86/kernel/cpu/perf_counter.c

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