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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-02-18 13:39:37 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:57 +0200
commit79b3feffb10417f197d2ab48dd4fa3c0c9e7d788 (patch)
tree78b754d36beddd15f43723faa861e06b239ca47b /kernel/sched_fair.c
parent19fb518c2a0c5d88ed22bba7083b7e7bc2a9c231 (diff)
sched: fix regression with sched yield
Balbir Singh reported: > 1:mon> t > [c0000000e7677da0] c000000000067de0 .sys_sched_yield+0x6c/0xbc > [c0000000e7677e30] c000000000008748 syscall_exit+0x0/0x40 > --- Exception: c01 (System Call) at 00000400001d09e4 > SP (4000664cb10) is in userspace > 1:mon> r > cpu 0x1: Vector: 300 (Data Access) at [c0000000e7677aa0] > pc: c000000000068e50: .yield_task_fair+0x94/0xc4 > lr: c000000000067de0: .sys_sched_yield+0x6c/0xbc the check that should have avoided that is: /* * Are we the only task in the tree? */ if (unlikely(rq->load.weight == curr->se.load.weight)) return; But I guess that overlooks rt tasks, they also increase the load. So I guess something like this ought to fix it.. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index bedda18f37a..290cf770b71 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -904,7 +904,7 @@ static void yield_task_fair(struct rq *rq)
/*
* Already in the rightmost position?
*/
- if (unlikely(rightmost->vruntime < se->vruntime))
+ if (unlikely(!rightmost || rightmost->vruntime < se->vruntime))
return;
/*