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From a1f857c1918e1e9cf21358347d4f0bbd0c6da587 Mon Sep 17 00:00:00 2001
From: Scott Wood <swood@redhat.com>
Date: Sat, 27 Jul 2019 00:56:32 -0500
Subject: [PATCH 299/347] sched: __set_cpus_allowed_ptr: Check cpus_mask, not
cpus_ptr
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
[ Upstream commit e5606fb7b042db634ed62b4dd733d62e050e468f ]
This function is concerned with the long-term cpu mask, not the
transitory mask the task might have while migrate disabled. Before
this patch, if a task was migrate disabled at the time
__set_cpus_allowed_ptr() was called, and the new mask happened to be
equal to the cpu that the task was running on, then the mask update
would be lost.
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/sched/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 33c1ae19410e..4f5242c9ca78 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1157,7 +1157,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
goto out;
}
- if (cpumask_equal(p->cpus_ptr, new_mask))
+ if (cpumask_equal(&p->cpus_mask, new_mask))
goto out;
dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask);
--
2.36.1
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