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ARM: 6865/1: perf: ensure pass through zero is counted on overflow

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Commit a737823d ("ARM: perf: ensure overflows aren't missed due to IRQ
latency") changed the way that event deltas are calculated on overflow
so that we don't miss events when the new count value overtakes the
previous one.

Unfortunately, we forget to count the event that passes through zero so
we end up being off by 1. This patch adds on the correction.

Reported-by: Chris Moore <moore@free.fr>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2011-04-05 14:01:24 +01:00 committed by Russell King
parent e89c0d7090
commit 6759788b94
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/perf_event.c
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@ -221,7 +221,7 @@ again:
prev_raw_count &= armpmu->max_period;
if (overflow)
delta = armpmu->max_period - prev_raw_count + new_raw_count;
delta = armpmu->max_period - prev_raw_count + new_raw_count + 1;
else
delta = new_raw_count - prev_raw_count;