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sched/core: Clear prev->dl_server in CFS pick fast path

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commit a741b82423 upstream.

In case the previous pick was a DL server pick, ->dl_server might be
set. Clear it in the fast path as well.

Fixes: 63ba8422f8 ("sched/deadline: Introduce deadline servers")
Signed-off-by: Youssef Esmat <youssefesmat@google.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/7f7381ccba09efcb4a1c1ff808ed58385eccc222.1716811044.git.bristot@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Youssef Esmat
2024-05-27 14:06:49 +02:00
committed by Greg Kroah-Hartman
parent 6cdec86523
commit 782d5a758d
1 changed files with 7 additions and 0 deletions
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kernel/sched/core.c
+7
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@@ -5827,6 +5827,13 @@ __pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
p = pick_next_task_idle(rq);
}
/*
* This is a normal CFS pick, but the previous could be a DL pick.
* Clear it as previous is no longer picked.
*/
if (prev->dl_server)
prev->dl_server = NULL;
/*
* This is the fast path; it cannot be a DL server pick;
* therefore even if @p == @prev, ->dl_server must be NULL.