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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2012-05-24 20:40:55 +0530
committerThomas Gleixner <tglx@linutronix.de>2012-05-24 22:58:08 +0200
commitee74d13229fb606353ff56f4927fa93b37e95bbe (patch)
tree6cfc806db818bdc739c5a46d41e2c81c96364463 /kernel/smpboot.c
parentf9369910a6225b8d4892c3f20ae740a711cd5ace (diff)
downloadlinux-sh-ee74d13229fb606353ff56f4927fa93b37e95bbe.tar.gz
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>
Diffstat (limited to 'kernel/smpboot.c')
-rw-r--r--kernel/smpboot.c6
1 files changed, 4 insertions, 2 deletions
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);
}
}