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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-14 16:55:11 +0900 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-14 16:55:11 +0900 |
| commit | fe8a45df368038566c62bf311accf4319b210123 (patch) | |
| tree | c39ab7df07ccf71eaeed742d3a575c269f992cbc /kernel/cpu.c | |
| parent | 5e30025a319910695f5010dc0fb53a23299da14d (diff) | |
| parent | 85b088e934b9943322bfe37077289ae60f1b3414 (diff) | |
| download | lwn-fe8a45df368038566c62bf311accf4319b210123.tar.gz lwn-fe8a45df368038566c62bf311accf4319b210123.zip | |
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar:
"Four bugfixes and one performance fix"
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/fair: Avoid integer overflow
sched: Optimize task_sched_runtime()
sched/numa: Cure update_numa_stats() vs. hotplug
sched/numa: Fix NULL pointer dereference in task_numa_migrate()
sched: Fix endless sync_sched/rcu() loop inside _cpu_down()
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 973d034acf84..deff2e693766 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -306,7 +306,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) __func__, cpu); goto out_release; } - smpboot_park_threads(cpu); /* * By now we've cleared cpu_active_mask, wait for all preempt-disabled @@ -315,12 +314,16 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) * * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might * not imply sync_sched(), so explicitly call both. + * + * Do sync before park smpboot threads to take care the rcu boost case. */ #ifdef CONFIG_PREEMPT synchronize_sched(); #endif synchronize_rcu(); + smpboot_park_threads(cpu); + /* * So now all preempt/rcu users must observe !cpu_active(). */ |