61 lines
2.1 KiB
Diff
61 lines
2.1 KiB
Diff
From c1079fcb888f7bbdef9e2d4cc03c1d4eb26e4dd5 Mon Sep 17 00:00:00 2001
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Message-Id: <c1079fcb888f7bbdef9e2d4cc03c1d4eb26e4dd5.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 7 Jun 2011 09:19:06 +0200
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Subject: [PATCH 110/333] sched: Do not account rcu_preempt_depth on RT in
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might_sleep()
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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RT changes the rcu_preempt_depth semantics, so we cannot check for it
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in might_sleep().
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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include/linux/rcupdate.h | 7 +++++++
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kernel/sched/core.c | 2 +-
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2 files changed, 8 insertions(+), 1 deletion(-)
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diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
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index 68cbe111420b..027c58cdbb6e 100644
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--- a/include/linux/rcupdate.h
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+++ b/include/linux/rcupdate.h
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@@ -73,6 +73,11 @@ void synchronize_rcu(void);
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* types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
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*/
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#define rcu_preempt_depth() (current->rcu_read_lock_nesting)
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+#ifndef CONFIG_PREEMPT_RT_FULL
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+#define sched_rcu_preempt_depth() rcu_preempt_depth()
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+#else
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+static inline int sched_rcu_preempt_depth(void) { return 0; }
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+#endif
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#else /* #ifdef CONFIG_PREEMPT_RCU */
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@@ -96,6 +101,8 @@ static inline int rcu_preempt_depth(void)
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return 0;
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}
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+#define sched_rcu_preempt_depth() rcu_preempt_depth()
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+
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#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
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/* Internal to kernel */
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diff --git a/kernel/sched/core.c b/kernel/sched/core.c
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index 53d9f8927619..2aa1d2a9ee5e 100644
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--- a/kernel/sched/core.c
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+++ b/kernel/sched/core.c
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@@ -6193,7 +6193,7 @@ void __init sched_init(void)
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
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static inline int preempt_count_equals(int preempt_offset)
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{
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- int nested = preempt_count() + rcu_preempt_depth();
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+ int nested = preempt_count() + sched_rcu_preempt_depth();
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return (nested == preempt_offset);
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}
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--
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2.17.1
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