Commit-ID: ee74d13229fb606353ff56f4927fa93b37e95bbe
Gitweb: http://git.kernel.org/tip/ee74d13229fb606353ff56f4927fa93b37e95bbe
Author: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 24 May 2012 20:40:55 +0530
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Cc: suresh.b.siddha@xxxxxxxxx
Cc: venki@xxxxxxxxxx
Cc: nikunj@xxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20120524151055.2549.64309.stgit@xxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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);
}
}
--
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