Commit-ID: c13d38e4a1fd5dd07135403c613c8091af444169 Gitweb: http://git.kernel.org/tip/c13d38e4a1fd5dd07135403c613c8091af444169 Author: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> AuthorDate: Tue, 16 Oct 2012 13:28:17 +0530 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 24 Oct 2012 10:01:59 +0200 perf, cpu hotplug: Use cached value of smp_processor_id() The perf_cpu_notifier() macro invokes smp_processor_id() multiple times. Optimize it by using a local variable. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: peterz@xxxxxxxxxxxxx Cc: acme@xxxxxxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/20121016075817.3572.76733.stgit@xxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- include/linux/perf_event.h | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 0647805..6bfb2faa 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -803,15 +803,16 @@ static inline void perf_event_task_tick(void) { } do { \ static struct notifier_block fn##_nb __cpuinitdata = \ { .notifier_call = fn, .priority = CPU_PRI_PERF }; \ + unsigned long cpu = smp_processor_id(); \ unsigned long flags; \ fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \ - (void *)(unsigned long)smp_processor_id()); \ + (void *)(unsigned long)cpu); \ local_irq_save(flags); \ fn(&fn##_nb, (unsigned long)CPU_STARTING, \ - (void *)(unsigned long)smp_processor_id()); \ + (void *)(unsigned long)cpu); \ local_irq_restore(flags); \ fn(&fn##_nb, (unsigned long)CPU_ONLINE, \ - (void *)(unsigned long)smp_processor_id()); \ + (void *)(unsigned long)cpu); \ register_cpu_notifier(&fn##_nb); \ } while (0) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html