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sched: define and use CPU_PRI_* enums for cpu notifier priorities

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Instead of hardcoding priority 10 and 20 in sched and perf, collect
them into CPU_PRI_* enums.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tejun Heo 2010-06-08 21:40:36 +02:00
parent 3975d16760
commit 50a323b730
3 changed files with 11 additions and 2 deletions
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9
include/linux/cpu.h
View File

@ -48,6 +48,15 @@ extern ssize_t arch_cpu_release(const char *, size_t);
#endif
struct notifier_block;
/*
* CPU notifier priorities.
*/
enum {
/* migration should happen before other stuff but after perf */
CPU_PRI_PERF = 20,
CPU_PRI_MIGRATION = 10,
};
#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)

2
include/linux/perf_event.h
View File

@ -1068,7 +1068,7 @@ static inline void perf_event_disable(struct perf_event *event) { }
#define perf_cpu_notifier(fn) \
do { \
static struct notifier_block fn##_nb __cpuinitdata = \
{ .notifier_call = fn, .priority = 20 }; \
{ .notifier_call = fn, .priority = CPU_PRI_PERF }; \
fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
(void *)(unsigned long)smp_processor_id()); \
fn(&fn##_nb, (unsigned long)CPU_STARTING, \

2
kernel/sched.c
View File

@ -5801,7 +5801,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
*/
static struct notifier_block __cpuinitdata migration_notifier = {
.notifier_call = migration_call,
.priority = 10
.priority = CPU_PRI_MIGRATION,
};
static int __init migration_init(void)