[lkml]   [2020]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH RT 06/23] sched: __set_cpus_allowed_ptr: Check cpus_mask, not cpus_ptr
From: Scott Wood <>

v4.14.170-rt75-rc2 stable review patch.
If anyone has any objections, please let me know.


[ 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 <>
Signed-off-by: Sebastian Andrzej Siewior <>
Signed-off-by: Tom Zanussi <>
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 fcff75934bdc..8d6badac9225 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1192,7 +1192,7 @@ 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);
 \ /
  Last update: 2020-02-27 15:34    [W:0.125 / U:1.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site