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Date: Thu, 24 May 2012 14:04:28 -0700 From: "tip-bot for Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, srivatsa.bhat@...ux.vnet.ibm.com, tglx@...utronix.de Subject: [tip:smp/hotplug] smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init() Commit-ID: ee74d13229fb606353ff56f4927fa93b37e95bbe Gitweb: http://git.kernel.org/tip/ee74d13229fb606353ff56f4927fa93b37e95bbe Author: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com> AuthorDate: Thu, 24 May 2012 20:40:55 +0530 Committer: Thomas Gleixner <tglx@...utronix.de> CommitDate: Thu, 24 May 2012 22:58:08 +0200 smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init() While trying to initialize idle threads for all cpus, idle_threads_init() calls smp_processor_id() in a loop, which is unnecessary. The intent is to initialize idle threads for all non-boot cpus. So just use a variable to note the boot cpu and use it in the loop. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com> Cc: suresh.b.siddha@...el.com Cc: venki@...gle.com Cc: nikunj@...ux.vnet.ibm.com Link: http://lkml.kernel.org/r/20120524151055.2549.64309.stgit@srivatsabhat.in.ibm.com Signed-off-by: Thomas Gleixner <tglx@...utronix.de> --- kernel/smpboot.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/smpboot.c b/kernel/smpboot.c index e1a797e..0f2162f 100644 --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -52,10 +52,12 @@ static inline void idle_init(unsigned int cpu) */ void __init idle_threads_init(void) { - unsigned int cpu; + unsigned int cpu, boot_cpu; + + boot_cpu = smp_processor_id(); for_each_possible_cpu(cpu) { - if (cpu != smp_processor_id()) + if (cpu != boot_cpu) idle_init(cpu); } } -- 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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