ARM: 6865/1: perf: ensure pass through zero is counted on overflow
authorWill Deacon <will.deacon@arm.com>
Tue, 5 Apr 2011 13:01:24 +0000 (14:01 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Sun, 10 Apr 2011 20:13:35 +0000 (21:13 +0100)
commit6759788b944139793bffa889761cc3d8d703fdc0
treeac97143a319067bb8d5929d83f34df646d703189
parente89c0d7090c54d7b11b9b091e495a1ae345dd3ff
ARM: 6865/1: perf: ensure pass through zero is counted on overflow

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>
arch/arm/kernel/perf_event.c