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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-12-01 12:21:47 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-09 10:03:08 +0100 |
| commit | fb58bac5c75bfff8bbf7d02071a10a62f32fe28b (patch) | |
| tree | b2ff68b388efa043c152d75254da27171ea5e586 /kernel/sched_fair.c | |
| parent | 6cecd084d0fd27bb1e498e2829fd45846d806856 (diff) | |
| download | op-kernel-dev-fb58bac5c75bfff8bbf7d02071a10a62f32fe28b.zip op-kernel-dev-fb58bac5c75bfff8bbf7d02071a10a62f32fe28b.tar.gz | |
sched: Remove unnecessary RCU exclusion
As Nick pointed out, and realized by myself when doing:
sched: Fix balance vs hotplug race
the patch:
sched: for_each_domain() vs RCU
is wrong, sched_domains are freed after synchronize_sched(), which
means disabling preemption is enough.
Reported-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index e9f5dae..c163a28 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1403,7 +1403,6 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag new_cpu = prev_cpu; } - rcu_read_lock(); for_each_domain(cpu, tmp) { /* * If power savings logic is enabled for a domain, see if we @@ -1484,10 +1483,8 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag update_shares(tmp); } - if (affine_sd && wake_affine(affine_sd, p, sync)) { - new_cpu = cpu; - goto out; - } + if (affine_sd && wake_affine(affine_sd, p, sync)) + return cpu; while (sd) { int load_idx = sd->forkexec_idx; @@ -1528,8 +1525,6 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag /* while loop will break here if sd == NULL */ } -out: - rcu_read_unlock(); return new_cpu; } #endif /* CONFIG_SMP */ |
