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timers: Use __fls in apply_slack()

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In apply_slack(), find_last_bit() is applied to a bitmask consisting
of precisely BITS_PER_LONG bits. Since mask is non-zero, we might as
well eliminate the function call and use __fls() directly. On x86_64,
this shaves 23 bytes of the only caller, mod_timer().

This also gets rid of Coverity CID 1192106, but that is a false
positive: Coverity is not aware that mask != 0 implies that
find_last_bit will not return BITS_PER_LONG.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/1443771931-6284-1-git-send-email-linux@rasmusvillemoes.dk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Rasmus Villemoes 2015-10-02 09:45:30 +02:00 committed by Thomas Gleixner
parent cfed432d7f
commit 9fc4468d54
1 changed files with 1 additions and 1 deletions
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2
kernel/time/timer.c
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@ -874,7 +874,7 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
if (mask == 0)
return expires;
bit = find_last_bit(&mask, BITS_PER_LONG);
bit = __fls(mask);
mask = (1UL << bit) - 1;