diff options
Diffstat (limited to 'debian/patches-rt/0127-rtmutex-trylock-is-okay-on-RT.patch')
| -rw-r--r-- | debian/patches-rt/0127-rtmutex-trylock-is-okay-on-RT.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/debian/patches-rt/0127-rtmutex-trylock-is-okay-on-RT.patch b/debian/patches-rt/0127-rtmutex-trylock-is-okay-on-RT.patch new file mode 100644 index 000000000..292becc02 --- /dev/null +++ b/debian/patches-rt/0127-rtmutex-trylock-is-okay-on-RT.patch @@ -0,0 +1,34 @@ +From 0b94209cb7e2a97538d5f7cf08c0d1433cc83b05 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 2 Dec 2015 11:34:07 +0100 +Subject: [PATCH 127/347] rtmutex: trylock is okay on -RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +non-RT kernel could deadlock on rt_mutex_trylock() in softirq context. On +-RT we don't run softirqs in IRQ context but in thread context so it is +not a issue here. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/locking/rtmutex.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c +index a5ec4f68527e..4bec24dfafc6 100644 +--- a/kernel/locking/rtmutex.c ++++ b/kernel/locking/rtmutex.c +@@ -1583,7 +1583,11 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock) + { + int ret; + ++#ifdef CONFIG_PREEMPT_RT_FULL ++ if (WARN_ON_ONCE(in_irq() || in_nmi())) ++#else + if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq())) ++#endif + return 0; + + ret = rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock); +-- +2.36.1 + |