sched/fair: Fix NEXT_BUDDY

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[ Upstream commit 493afbd187 ]

Adam reports that enabling NEXT_BUDDY insta triggers a WARN in
pick_next_entity().

Moving clear_buddies() up before the delayed dequeue bits ensures
no ->next buddy becomes delayed. Further ensure no new ->next buddy
ever starts as delayed.

Fixes: 152e11f6df ("sched/fair: Implement delayed dequeue")
Reported-by: Adam Li <adamli@os.amperecomputing.com>
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Adam Li <adamli@os.amperecomputing.com>
Link: https://lkml.kernel.org/r/670a0d54-e398-4b1f-8a6e-90784e2fdf89@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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K Prateek Nayak 2024-11-28 12:59:54 +05:30 • committed by Greg Kroah-Hartman

parent 5d4380ec05

commit 5dbe6816c4

1 changed files with 2 additions and 5 deletions

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kernel/sched/fair.c

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