From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754597AbcDANrw (ORCPT ); Fri, 1 Apr 2016 09:47:52 -0400 Received: from mail-wm0-f52.google.com ([74.125.82.52]:32953 "EHLO mail-wm0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750751AbcDANrv (ORCPT ); Fri, 1 Apr 2016 09:47:51 -0400 From: Daniel Lezcano To: peterz@infradead.org Cc: Ingo Molnar , linux-kernel@vger.kernel.org (open list:SCHEDULER) Subject: [PATCH] sched/clock: Remove pointless test in cpu_clock/local_clock Date: Fri, 1 Apr 2016 15:46:48 +0200 Message-Id: <1459518409-9448-1-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case the HAVE_UNSTABLE_SCHED_CLOCK config is set, the cpu_clock() version checks if sched_clock_stable() is not set and calls sched_clock_cpu(), otherwise it calls sched_clock(). sched_clock_cpu() checks also if sched_clock_stable() is set and, if true, calls sched_clock(). sched_clock() will be called in sched_clock_cpu() if sched_clock_stable() is true. Remove the duplicate test by directly calling sched_clock_cpu() and let the static key act in this function instead. We can assume gcc is smart enough to inline cpu_clock()/local_clock() to sched_clock_cpu(). Signed-off-by: Daniel Lezcano --- kernel/sched/clock.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c index fedb967..30c4b20 100644 --- a/kernel/sched/clock.c +++ b/kernel/sched/clock.c @@ -375,10 +375,7 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event); */ u64 cpu_clock(int cpu) { - if (!sched_clock_stable()) - return sched_clock_cpu(cpu); - - return sched_clock(); + return sched_clock_cpu(cpu); } /* @@ -390,10 +387,7 @@ u64 cpu_clock(int cpu) */ u64 local_clock(void) { - if (!sched_clock_stable()) - return sched_clock_cpu(raw_smp_processor_id()); - - return sched_clock(); + return sched_clock_cpu(raw_smp_processor_id()); } #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */ -- 1.9.1