diff options
Diffstat (limited to 'features/rt/sched-Do-not-account-rcu_preempt_depth-on-RT-in-migh.patch')
-rw-r--r-- | features/rt/sched-Do-not-account-rcu_preempt_depth-on-RT-in-migh.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/features/rt/sched-Do-not-account-rcu_preempt_depth-on-RT-in-migh.patch b/features/rt/sched-Do-not-account-rcu_preempt_depth-on-RT-in-migh.patch new file mode 100644 index 00000000..3e3b66a4 --- /dev/null +++ b/features/rt/sched-Do-not-account-rcu_preempt_depth-on-RT-in-migh.patch @@ -0,0 +1,56 @@ +From b3451220b4d08d1f80b2e4c10a2cd5d8bc9724e5 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 7 Jun 2011 09:19:06 +0200 +Subject: [PATCH 122/191] sched: Do not account rcu_preempt_depth on RT in + might_sleep() + +RT changes the rcu_preempt_depth semantics, so we cannot check for it +in might_sleep(). + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +--- + include/linux/rcupdate.h | 7 +++++++ + kernel/sched/core.c | 2 +- + 2 files changed, 8 insertions(+), 1 deletion(-) + +diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h +index 6d855ef091ba..8b18be4c38ce 100644 +--- a/include/linux/rcupdate.h ++++ b/include/linux/rcupdate.h +@@ -54,6 +54,11 @@ void __rcu_read_unlock(void); + * types of kernel builds, the rcu_read_lock() nesting depth is unknowable. + */ + #define rcu_preempt_depth() (current->rcu_read_lock_nesting) ++#ifndef CONFIG_PREEMPT_RT ++#define sched_rcu_preempt_depth() rcu_preempt_depth() ++#else ++static inline int sched_rcu_preempt_depth(void) { return 0; } ++#endif + + #else /* #ifdef CONFIG_PREEMPT_RCU */ + +@@ -79,6 +84,8 @@ static inline int rcu_preempt_depth(void) + return 0; + } + ++#define sched_rcu_preempt_depth() rcu_preempt_depth() ++ + #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ + + /* Internal to kernel */ +diff --git a/kernel/sched/core.c b/kernel/sched/core.c +index 2069022bdce5..c05455d4f034 100644 +--- a/kernel/sched/core.c ++++ b/kernel/sched/core.c +@@ -8323,7 +8323,7 @@ void __init sched_init(void) + #ifdef CONFIG_DEBUG_ATOMIC_SLEEP + static inline int preempt_count_equals(int preempt_offset) + { +- int nested = preempt_count() + rcu_preempt_depth(); ++ int nested = preempt_count() + sched_rcu_preempt_depth(); + + return (nested == preempt_offset); + } +-- +2.19.1 + |