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| author | Ingo Molnar <mingo@kernel.org> | 2013-11-06 06:50:37 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-11-06 06:50:37 (GMT) |
| commit | c90423d1de12fbeaf0c898e1db0e962de347302b (patch) | |
| tree | 8c7a32b37e74155324ae2b556fcc42718ccf29a3 /kernel/cpu.c | |
| parent | ecf1f014325ba60f4df35edae1a357c67c5d4eb1 (diff) | |
| parent | b8a216269ec0ce2e961d32e6d640d7010b8a818e (diff) | |
| download | linux-c90423d1de12fbeaf0c898e1db0e962de347302b.tar.xz | |
Merge branch 'sched/core' into core/locking, to prepare the kernel/locking/ file move
Conflicts:
kernel/Makefile
There are conflicts in kernel/Makefile due to file moving in the
scheduler tree - resolve them.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index d7f07a2..63aa50d 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -308,6 +308,23 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) } smpboot_park_threads(cpu); + /* + * By now we've cleared cpu_active_mask, wait for all preempt-disabled + * and RCU users of this state to go away such that all new such users + * will observe it. + * + * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might + * not imply sync_sched(), so explicitly call both. + */ +#ifdef CONFIG_PREEMPT + synchronize_sched(); +#endif + synchronize_rcu(); + + /* + * So now all preempt/rcu users must observe !cpu_active(). + */ + err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); if (err) { /* CPU didn't die: tell everyone. Can't complain. */ |