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Subject: sched: Do not account rcu_preempt_depth on RT in might_sleep()
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 07 Jun 2011 09:19:06 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.21-rt34.tar.xz
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(-)
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -52,6 +52,11 @@ 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 */
@@ -77,6 +82,8 @@ 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 */
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7874,7 +7874,7 @@ 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);
}
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