diff options
Diffstat (limited to 'debian/patches-rt/0229-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch')
| -rw-r--r-- | debian/patches-rt/0229-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/debian/patches-rt/0229-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch b/debian/patches-rt/0229-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch new file mode 100644 index 000000000..2c10d0def --- /dev/null +++ b/debian/patches-rt/0229-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch @@ -0,0 +1,39 @@ +From 1e7afdc27ed9146e30dc69cdc8fcdc2ce334430e Mon Sep 17 00:00:00 2001 +From: Mike Galbraith <efault@gmx.de> +Date: Sun, 19 Aug 2018 08:28:35 +0200 +Subject: [PATCH 229/347] sched: Allow pinned user tasks to be awakened to the + CPU they pinned +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +Since commit 7af443ee16976 ("sched/core: Require cpu_active() in +select_task_rq(), for user tasks") select_fallback_rq() will BUG() if +the CPU to which a task has pinned itself and pinned becomes +!cpu_active() while it slept. +The task will continue running on the to-be-removed CPU and will remove +itself from the CPU during takedown_cpu() (while cpuhp_pin_lock will be +acquired) and move to another CPU based on its mask after the +migrate_disable() section has been left. + +Cc: stable-rt@vger.kernel.org +Signed-off-by: Mike Galbraith <efault@gmx.de> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + 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 11afaa2c618a..dba425296275 100644 +--- a/kernel/sched/core.c ++++ b/kernel/sched/core.c +@@ -904,7 +904,7 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu) + if (!cpumask_test_cpu(cpu, p->cpus_ptr)) + return false; + +- if (is_per_cpu_kthread(p)) ++ if (is_per_cpu_kthread(p) || __migrate_disabled(p)) + return cpu_online(cpu); + + return cpu_active(cpu); +-- +2.36.1 + |