From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Sebastian Siewior <bigeasy@linutronix.de>
Subject: [patch 2/8] sched: Make cond_resched_*lock() variants consistent vs. might_sleep()
Date: Thu, 23 Sep 2021 18:54:37 +0200 (CEST) [thread overview]
Message-ID: <20210923165357.991262778@linutronix.de> (raw)
In-Reply-To: <20210923164145.466686140@linutronix.de>
Commit 3427445afd26 ("sched: Exclude cond_resched() from nested sleep
test") removed the task state check of __might_sleep() for
cond_resched_lock() because cond_resched_lock() is not a voluntary
scheduling point which blocks. It's a preemption point which requires the
lock holder to release the spin lock.
The same rationale applies to cond_resched_rwlock_read/write(), but those
were not touched.
Make it consistent and use the non-state checking __might_resched() there
as well.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/sched.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2054,14 +2054,14 @@ extern int __cond_resched_rwlock_write(r
__cond_resched_lock(lock); \
})
-#define cond_resched_rwlock_read(lock) ({ \
- __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
- __cond_resched_rwlock_read(lock); \
+#define cond_resched_rwlock_read(lock) ({ \
+ __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
+ __cond_resched_rwlock_read(lock); \
})
-#define cond_resched_rwlock_write(lock) ({ \
- __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
- __cond_resched_rwlock_write(lock); \
+#define cond_resched_rwlock_write(lock) ({ \
+ __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
+ __cond_resched_rwlock_write(lock); \
})
static inline void cond_resched_rcu(void)
next prev parent reply other threads:[~2021-09-23 16:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 16:54 [patch 0/8] sched: Clean up might_sleep() and make it RT aware Thomas Gleixner
2021-09-23 16:54 ` [patch 1/8] sched: Clean up the might_sleep() underscore zoo Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` Thomas Gleixner [this message]
2021-10-01 15:05 ` [tip: locking/core] sched: Make cond_resched_*lock() variants consistent vs. might_sleep() tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 3/8] sched: Remove preempt_offset argument from __might_sleep() Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 4/8] sched: Cleanup might_sleep() printks Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 5/8] sched: Make might_sleep() output less confusing Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 6/8] sched: Make RCU nest depth distinct in __might_resched() Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 7/8] sched: Make cond_resched_lock() variants RT aware Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-23 16:54 ` [patch 8/8] locking/rt: Take RCU nesting into account for __might_resched() Thomas Gleixner
2021-10-01 15:05 ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
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