From 01cbb896854fa0cccd07b728402d50b349946011 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 7 Jun 2011 09:19:06 +0200 Subject: [PATCH 111/269] sched: Do not account rcu_preempt_depth on RT in might_sleep() Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.37-rt20.tar.xz RT changes the rcu_preempt_depth semantics, so we cannot check for it in might_sleep(). Signed-off-by: Thomas Gleixner --- 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 75e5b393cf44..0539f55bf7b3 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -73,6 +73,11 @@ void synchronize_rcu(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_FULL +#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 */ @@ -98,6 +103,8 @@ 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 e7dccbb9973a..8033a8f4efdd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6156,7 +6156,7 @@ 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); } -- 2.20.1