From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: tglx@linutronix.de, boqun.feng@gmail.com,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Juri Lelli <juri.lelli@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>,
Mike Galbraith <efault@gmx.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: Re: [PATCH 1/4] sched/wakeup: Strengthen current_save_and_set_rtlock_wait_state()
Date: Fri, 10 Sep 2021 14:45:30 +0200 [thread overview]
Message-ID: <20210910124530.iezmxpzzhkbl6gwt@linutronix.de> (raw)
In-Reply-To: <20210909110203.767330253@infradead.org>
On 2021-09-09 12:59:16 [+0200], Peter Zijlstra wrote:
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -253,22 +254,24 @@ struct task_group;
> */
> #define current_save_and_set_rtlock_wait_state() \
> do { \
> - lockdep_assert_irqs_disabled(); \
> - raw_spin_lock(¤t->pi_lock); \
> + unsigned long flags; /* may shadow */ \
could we haz __flags so no shadow?
> + \
> + raw_spin_lock_irqsave(¤t->pi_lock, flags); \
> current->saved_state = current->__state; \
> debug_rtlock_wait_set_state(); \
> - WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \
> - raw_spin_unlock(¤t->pi_lock); \
> + smp_store_mb(current->__state, TASK_RTLOCK_WAIT); \
> + raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \
Sebastian
next prev parent reply other threads:[~2021-09-10 12:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-09 10:59 [PATCH 0/4] locking/rwbase: Assorted fixes Peter Zijlstra
2021-09-09 10:59 ` [PATCH 1/4] sched/wakeup: Strengthen current_save_and_set_rtlock_wait_state() Peter Zijlstra
2021-09-09 13:45 ` Will Deacon
2021-09-09 14:27 ` Peter Zijlstra
2021-09-10 12:57 ` Will Deacon
2021-09-10 13:17 ` Peter Zijlstra
2021-09-10 14:01 ` Peter Zijlstra
2021-09-10 15:06 ` Will Deacon
2021-09-10 16:07 ` Waiman Long
2021-09-10 17:09 ` Peter Zijlstra
2021-09-12 3:57 ` Boqun Feng
2021-09-10 12:45 ` Sebastian Andrzej Siewior [this message]
2021-09-13 22:08 ` Thomas Gleixner
2021-09-13 22:52 ` Thomas Gleixner
2021-09-14 6:45 ` Peter Zijlstra
2021-09-09 10:59 ` [PATCH 2/4] locking/rwbase: Properly match set_and_save_state() to restore_state() Peter Zijlstra
2021-09-09 13:53 ` Will Deacon
2021-09-14 7:31 ` Thomas Gleixner
2021-09-16 11:59 ` [tip: locking/urgent] " tip-bot2 for Peter Zijlstra
2021-09-09 10:59 ` [PATCH 3/4] locking/rwbase: Fix rwbase_write_lock() vs __rwbase_read_lock() Peter Zijlstra
2021-09-14 7:45 ` Thomas Gleixner
2021-09-14 13:59 ` Peter Zijlstra
2021-09-14 15:00 ` Thomas Gleixner
2021-09-16 11:59 ` [tip: locking/urgent] locking/rwbase: Extract __rwbase_write_trylock() tip-bot2 for Peter Zijlstra
2021-09-09 10:59 ` [PATCH 4/4] locking/rwbase: Take care of ordering guarantee for fastpath reader Peter Zijlstra
2021-09-14 7:46 ` Thomas Gleixner
2021-09-16 11:59 ` [tip: locking/urgent] " tip-bot2 for Boqun Feng
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