From: Srivatsa S. Bhat Date: Thu, 24 May 2012 15:10:55 +0000 (+0530) Subject: smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ee74d13229fb606353ff56f4927fa93b37e95bbe;p=linux-beck.git 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 Cc: suresh.b.siddha@intel.com Cc: venki@google.com Cc: nikunj@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/20120524151055.2549.64309.stgit@srivatsabhat.in.ibm.com Signed-off-by: Thomas Gleixner --- diff --git a/kernel/smpboot.c b/kernel/smpboot.c index e1a797e028a3..0f2162f808a7 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); } }