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Date: Fri, 2 Oct 2015 09:45:30 +0200 From: Rasmus Villemoes <linux@...musvillemoes.dk> To: John Stultz <john.stultz@...aro.org>, Thomas Gleixner <tglx@...utronix.de> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>, linux-kernel@...r.kernel.org Subject: [PATCH] kernel: time: timer.c: use __fls in apply_slack() 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@...musvillemoes.dk> --- kernel/time/timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 84190f02b521..71eb089d1030 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -867,7 +867,7 @@ 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; -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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