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| author | Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> | 2012-05-24 20:40:55 +0530 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-05-24 22:58:08 +0200 |
| commit | ee74d13229fb606353ff56f4927fa93b37e95bbe (patch) | |
| tree | 6cfc806db818bdc739c5a46d41e2c81c96364463 /kernel/smpboot.c | |
| parent | f9369910a6225b8d4892c3f20ae740a711cd5ace (diff) | |
| download | lwn-ee74d13229fb606353ff56f4927fa93b37e95bbe.tar.gz lwn-ee74d13229fb606353ff56f4927fa93b37e95bbe.zip | |
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.c | 6 |
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); } } |