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smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init()

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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>
This commit is contained in:
Srivatsa S. Bhat 2012-05-24 20:40:55 +05:30 committed by Thomas Gleixner
parent f9369910a6
commit ee74d13229
1 changed files with 4 additions and 2 deletions
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6
kernel/smpboot.c
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@ -52,10 +52,12 @@ static inline void idle_init(unsigned int cpu)
*/ */
void __init idle_threads_init(void) void __init idle_threads_init(void)
{ {
unsigned int cpu; unsigned int cpu, boot_cpu;
boot_cpu = smp_processor_id();
for_each_possible_cpu(cpu) { for_each_possible_cpu(cpu) {
if (cpu != smp_processor_id()) if (cpu != boot_cpu)
idle_init(cpu); idle_init(cpu);
} }
} }