diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
commit | b15a952c52a6825376d3e7f6c1bf5c886c6d8b74 (patch) | |
tree | 1500f2f8f276908a36d8126cb632c0d6b1276764 /debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch | |
parent | Adding upstream version 5.10.209. (diff) | |
download | linux-debian.tar.xz linux-debian.zip |
Adding debian version 5.10.209-2.debian/5.10.209-2debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch')
-rw-r--r-- | debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch b/debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch new file mode 100644 index 000000000..f59c122c0 --- /dev/null +++ b/debian/patches-rt/0299-sched-Fix-get_push_task-vs-migrate_disable.patch @@ -0,0 +1,46 @@ +From 93c4258bc009109bee258c30fa2a53680c8b1f9a Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Thu, 26 Aug 2021 15:37:38 +0200 +Subject: [PATCH 299/323] sched: Fix get_push_task() vs migrate_disable() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +push_rt_task() attempts to move the currently running task away if the +next runnable task has migration disabled and therefore is pinned on the +current CPU. + +The current task is retrieved via get_push_task() which only checks for +nr_cpus_allowed == 1, but does not check whether the task has migration +disabled and therefore cannot be moved either. The consequence is a +pointless invocation of the migration thread which correctly observes +that the task cannot be moved. + +Return NULL if the task has migration disabled and cannot be moved to +another CPU. + +Cc: stable-rt@vger.kernel.org +Fixes: a7c81556ec4d3 ("sched: Fix migrate_disable() vs rt/dl balancing") +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> +Link: https://lkml.kernel.org/r/20210826133738.yiotqbtdaxzjsnfj@linutronix.de +Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> +--- + kernel/sched/sched.h | 3 +++ + 1 file changed, 3 insertions(+) + +diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h +index ad854a670701..bda12827832e 100644 +--- a/kernel/sched/sched.h ++++ b/kernel/sched/sched.h +@@ -1949,6 +1949,9 @@ static inline struct task_struct *get_push_task(struct rq *rq) + if (p->nr_cpus_allowed == 1) + return NULL; + ++ if (p->migration_disabled) ++ return NULL; ++ + rq->push_busy = true; + return get_task_struct(p); + } +-- +2.43.0 + |