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sched/core: Add clearing of ->dl_server in put_prev_task_balance()

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BugLink: https://bugs.launchpad.net/bugs/2089884

commit c245910049d04fbfa85bb2f5acd591c24e9907c7 upstream.

Paths using put_prev_task_balance() need to do a pick shortly
after. Make sure they also clear the ->dl_server on prev as a
part of that.

Fixes: 63ba8422f8 ("sched/deadline: Introduce deadline servers")
Signed-off-by: "Joel Fernandes (Google)" <joel@joelfernandes.org>
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/d184d554434bedbad0581cb34656582d78655150.1716811044.git.bristot@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Joel Fernandes (Google)
2024-05-27 14:06:48 +02:00
committed by Mehmet Basaran
parent ce2452a3f1
commit c645475cb9
1 changed files with 8 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/sched/core.c
+8 -8
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@@ -5997,6 +5997,14 @@ static void put_prev_task_balance(struct rq *rq, struct task_struct *prev,
#endif
put_prev_task(rq, prev);
/*
* We've updated @prev and no longer need the server link, clear it.
* Must be done before ->pick_next_task() because that can (re)set
* ->dl_server.
*/
if (prev->dl_server)
prev->dl_server = NULL;
}
/*
@@ -6040,14 +6048,6 @@ __pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
restart:
put_prev_task_balance(rq, prev, rf);
/*
* We've updated @prev and no longer need the server link, clear it.
* Must be done before ->pick_next_task() because that can (re)set
* ->dl_server.
*/
if (prev->dl_server)
prev->dl_server = NULL;
for_each_class(class) {
p = class->pick_next_task(rq);
if (p)