From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935265AbdCWPGk (ORCPT ); Thu, 23 Mar 2017 11:06:40 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:42669 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755615AbdCWPFZ (ORCPT ); Thu, 23 Mar 2017 11:05:25 -0400 Message-Id: <20170323150216.255058238@infradead.org> User-Agent: quilt/0.63-1 Date: Thu, 23 Mar 2017 15:56:10 +0100 From: Peter Zijlstra To: mingo@kernel.org, tglx@linutronix.de, juri.lelli@arm.com, rostedt@goodmis.org, xlpang@redhat.com, bigeasy@linutronix.de Cc: linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, jdesfossez@efficios.com, bristot@redhat.com, peterz@infradead.org Subject: [PATCH -v3 4/8] rtmutex: Clean up References: <20170323145606.480214279@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline; filename=peterz-cleanup-rt-mutex-2.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Previous patches changed the meaning of the return value of rt_mutex_slowunlock(); update comments and code to reflect this. Signed-off-by: Peter Zijlstra (Intel) --- kernel/futex.c | 7 ++++--- kernel/locking/rtmutex.c | 28 +++++++++++++--------------- kernel/locking/rtmutex_common.h | 2 +- 3 files changed, 18 insertions(+), 19 deletions(-) --- a/kernel/futex.c +++ b/kernel/futex.c @@ -1394,7 +1394,7 @@ static int wake_futex_pi(u32 __user *uad { u32 uninitialized_var(curval), newval; struct task_struct *new_owner; - bool deboost = false; + bool postunlock = false; DEFINE_WAKE_Q(wake_q); int ret = 0; @@ -1455,12 +1455,13 @@ static int wake_futex_pi(u32 __user *uad /* * We've updated the uservalue, this unlock cannot fail. */ - deboost = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q); + postunlock = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q); out_unlock: raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock); - rt_mutex_postunlock(&wake_q, deboost); + if (postunlock) + rt_mutex_postunlock(&wake_q); return ret; } --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -1330,7 +1330,8 @@ static inline int rt_mutex_slowtrylock(s /* * Slow path to release a rt-mutex. - * Return whether the current task needs to undo a potential priority boosting. + * + * Return whether the current task needs to call rt_mutex_postunlock(). */ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock, struct wake_q_head *wake_q) @@ -1401,8 +1402,7 @@ static bool __sched rt_mutex_slowunlock( raw_spin_unlock_irqrestore(&lock->wait_lock, flags); - /* check PI boosting */ - return true; + return true; /* call rt_mutex_postunlock() */ } /* @@ -1449,15 +1449,14 @@ rt_mutex_fasttrylock(struct rt_mutex *lo } /* - * Undo pi boosting (if necessary) and wake top waiter. + * Performs the wakeup of the the top-waiter and re-enables preemption. */ -void rt_mutex_postunlock(struct wake_q_head *wake_q, bool deboost) +void rt_mutex_postunlock(struct wake_q_head *wake_q) { wake_up_q(wake_q); /* Pairs with preempt_disable() in rt_mutex_slowunlock() */ - if (deboost) - preempt_enable(); + preempt_enable(); } static inline void @@ -1466,14 +1465,12 @@ rt_mutex_fastunlock(struct rt_mutex *loc struct wake_q_head *wqh)) { DEFINE_WAKE_Q(wake_q); - bool deboost; if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) return; - deboost = slowfn(lock, &wake_q); - - rt_mutex_postunlock(&wake_q, deboost); + if (slowfn(lock, &wake_q)) + rt_mutex_postunlock(&wake_q); } /** @@ -1593,19 +1590,20 @@ bool __sched __rt_mutex_futex_unlock(str */ preempt_disable(); - return true; /* deboost and wakeups */ + return true; /* call postunlock() */ } void __sched rt_mutex_futex_unlock(struct rt_mutex *lock) { DEFINE_WAKE_Q(wake_q); - bool deboost; + bool postunlock; raw_spin_lock_irq(&lock->wait_lock); - deboost = __rt_mutex_futex_unlock(lock, &wake_q); + postunlock = __rt_mutex_futex_unlock(lock, &wake_q); raw_spin_unlock_irq(&lock->wait_lock); - rt_mutex_postunlock(&wake_q, deboost); + if (postunlock) + rt_mutex_postunlock(&wake_q); } /** --- a/kernel/locking/rtmutex_common.h +++ b/kernel/locking/rtmutex_common.h @@ -122,7 +122,7 @@ extern void rt_mutex_futex_unlock(struct extern bool __rt_mutex_futex_unlock(struct rt_mutex *lock, struct wake_q_head *wqh); -extern void rt_mutex_postunlock(struct wake_q_head *wake_q, bool deboost); +extern void rt_mutex_postunlock(struct wake_q_head *wake_q); #ifdef CONFIG_DEBUG_RT_MUTEXES # include "rtmutex-debug.h"