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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-12-01 12:21:47 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-09 10:03:08 +0100
commitfb58bac5c75bfff8bbf7d02071a10a62f32fe28b (patch)
treeb2ff68b388efa043c152d75254da27171ea5e586 /kernel
parent6cecd084d0fd27bb1e498e2829fd45846d806856 (diff)
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')
-rw-r--r--kernel/sched_fair.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index e9f5daee12c..c163a285bf0 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 */