linux-kernel - [PATCH RT 3/8] sched: migrate_enable: Remove _

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Date:   Mon,  9 Mar 2020 14:47:48 -0500
From:   zanussi@...nel.org
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        Tom Zanussi <zanussi@...nel.org>
Cc:     Scott Wood <swood@...hat.com>
Subject: [PATCH RT 3/8] sched: migrate_enable: Remove __schedule() call

From: Scott Wood <swood@...hat.com>

v4.14.172-rt78-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


[ Upstream commit b8162e61e9a33bd1de6452eb838fbf50a93ddd9a ]

We can rely on preempt_enable() to schedule.  Besides simplifying the
code, this potentially allows sequences such as the following to be
permitted:

migrate_disable();
preempt_disable();
migrate_enable();
preempt_enable();

Suggested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Scott Wood <swood@...hat.com>
Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Tom Zanussi <zanussi@...nel.org>

 Conflicts:
	kernel/sched/core.c
---
 kernel/sched/core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 960daa6bc7f04..3ff48df25cff8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7024,7 +7024,6 @@ void migrate_enable(void)
 		stop_one_cpu_nowait(task_cpu(p), migration_cpu_stop,
 				    arg, work);
 		tlb_migrate_finish(p->mm);
-		__schedule(true);
 	}
 
 out:
-- 
2.14.1