Commit ee74d132 authored May 24, 2012 by Srivatsa S. Bhat Committed by Thomas Gleixner May 24, 2012

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@linux.vnet.ibm.com>
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 <tglx@linutronix.de>

parent f9369910

kernel/smpboot.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}
		}

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