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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 15 Nov 2017 17:29:51 +0100
Subject: [PATCH 097/353] time/hrtimer: avoid schedule_work() with interrupts
disabled
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=6ac94e556e7d6adbadd76a878334275ce3acd987
The NOHZ code tries to schedule a workqueue with interrupts disabled.
Since this does not work -RT I am switching it to swork instead.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/time/timer.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 0043bf8e2c90..3cb79167852f 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -218,8 +218,7 @@ static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]);
static DEFINE_STATIC_KEY_FALSE(timers_nohz_active);
static DEFINE_MUTEX(timer_keys_mutex);
-static void timer_update_keys(struct work_struct *work);
-static DECLARE_WORK(timer_update_work, timer_update_keys);
+static struct swork_event timer_update_swork;
#ifdef CONFIG_SMP
unsigned int sysctl_timer_migration = 1;
@@ -237,7 +236,7 @@ static void timers_update_migration(void)
static inline void timers_update_migration(void) { }
#endif /* !CONFIG_SMP */
-static void timer_update_keys(struct work_struct *work)
+static void timer_update_keys(struct swork_event *event)
{
mutex_lock(&timer_keys_mutex);
timers_update_migration();
@@ -247,9 +246,17 @@ static void timer_update_keys(struct work_struct *work)
void timers_update_nohz(void)
{
- schedule_work(&timer_update_work);
+ swork_queue(&timer_update_swork);
}
+static __init int hrtimer_init_thread(void)
+{
+ WARN_ON(swork_get());
+ INIT_SWORK(&timer_update_swork, timer_update_keys);
+ return 0;
+}
+early_initcall(hrtimer_init_thread);
+
int timer_migration_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
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