62 lines
1.7 KiB
Diff
62 lines
1.7 KiB
Diff
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From 0706847e73c25914d844b28de86dc7885f4da49f Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Thu, 14 Jul 2011 09:56:44 +0200
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Subject: [PATCH 136/365] sched: Take RT softirq semantics into account in
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cond_resched()
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The softirq semantics work different on -RT. There is no SOFTIRQ_MASK in
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the preemption counter which leads to the BUG_ON() statement in
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__cond_resched_softirq(). As for -RT it is enough to perform a "normal"
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schedule.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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include/linux/sched.h | 4 ++++
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kernel/sched/core.c | 2 ++
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2 files changed, 6 insertions(+)
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diff --git a/include/linux/sched.h b/include/linux/sched.h
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index a359535e907d..f986d30fca47 100644
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--- a/include/linux/sched.h
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+++ b/include/linux/sched.h
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@@ -3590,12 +3590,16 @@ extern int __cond_resched_lock(spinlock_t *lock);
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__cond_resched_lock(lock); \
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})
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+#ifndef CONFIG_PREEMPT_RT_FULL
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extern int __cond_resched_softirq(void);
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#define cond_resched_softirq() ({ \
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___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
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__cond_resched_softirq(); \
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})
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+#else
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+# define cond_resched_softirq() cond_resched()
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+#endif
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static inline void cond_resched_rcu(void)
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{
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diff --git a/kernel/sched/core.c b/kernel/sched/core.c
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index 7178c6a4a71c..6b637f1b298f 100644
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--- a/kernel/sched/core.c
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+++ b/kernel/sched/core.c
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@@ -5220,6 +5220,7 @@ int __cond_resched_lock(spinlock_t *lock)
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}
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EXPORT_SYMBOL(__cond_resched_lock);
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+#ifndef CONFIG_PREEMPT_RT_FULL
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int __sched __cond_resched_softirq(void)
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{
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BUG_ON(!in_softirq());
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@@ -5233,6 +5234,7 @@ int __sched __cond_resched_softirq(void)
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return 0;
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}
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EXPORT_SYMBOL(__cond_resched_softirq);
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+#endif
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/**
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* yield - yield the current processor to other threads.
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--
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2.28.0
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