From: Davidlohr Bueso <dave@stgolabs.net> To: tglx@linutronix.de Cc: arnd@arndb.de, balbi@kernel.org, bhelgaas@google.com, bigeasy@linutronix.de, dave@stgolabs.net, davem@davemloft.net, gregkh@linuxfoundation.org, joel@joelfernandes.org, kurt.schwemmer@microsemi.com, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, logang@deltatee.com, mingo@kernel.org, mpe@ellerman.id.au, netdev@vger.kernel.org, oleg@redhat.com, paulmck@kernel.org, peterz@infradead.org, rdunlap@infradead.org, rostedt@goodmis.org, torvalds@linux-foundation.org, will@kernel.org, Davidlohr Bueso <dbueso@suse.de> Subject: [PATCH 17/15] rcuwait: Inform rcuwait_wake_up() users if a wakeup was attempted Date: Fri, 20 Mar 2020 01:55:25 -0700 [thread overview] Message-ID: <20200320085527.23861-2-dave@stgolabs.net> (raw) In-Reply-To: <20200320085527.23861-1-dave@stgolabs.net> Let the caller know if wake_up_process() was actually called or not; some users can use this information for ad-hoc. Of course returning true does not guarantee that wake_up_process() actually woke anything up. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> --- include/linux/rcuwait.h | 2 +- kernel/exit.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h index 6e8798458091..3f83b9a12ad3 100644 --- a/include/linux/rcuwait.h +++ b/include/linux/rcuwait.h @@ -24,7 +24,7 @@ static inline void rcuwait_init(struct rcuwait *w) w->task = NULL; } -extern void rcuwait_wake_up(struct rcuwait *w); +extern bool rcuwait_wake_up(struct rcuwait *w); /* * The caller is responsible for locking around rcuwait_wait_event(), diff --git a/kernel/exit.c b/kernel/exit.c index 6cc6cc485d07..b0bb0a8ec4b1 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -234,9 +234,10 @@ void release_task(struct task_struct *p) goto repeat; } -void rcuwait_wake_up(struct rcuwait *w) +bool rcuwait_wake_up(struct rcuwait *w) { struct task_struct *task; + bool ret = false; rcu_read_lock(); @@ -254,10 +255,15 @@ void rcuwait_wake_up(struct rcuwait *w) smp_mb(); /* (B) */ task = rcu_dereference(w->task); - if (task) + if (task) { wake_up_process(task); + ret = true; + } rcu_read_unlock(); + + return ret; } +EXPORT_SYMBOL_GPL(rcuwait_wake_up); /* * Determine if a process group is "orphaned", according to the POSIX -- 2.16.4
WARNING: multiple messages have this Message-ID (diff)
From: Davidlohr Bueso <dave@stgolabs.net> To: tglx@linutronix.de Cc: rdunlap@infradead.org, peterz@infradead.org, linux-pci@vger.kernel.org, bigeasy@linutronix.de, linux-kernel@vger.kernel.org, joel@joelfernandes.org, will@kernel.org, mingo@kernel.org, dave@stgolabs.net, arnd@arndb.de, Davidlohr Bueso <dbueso@suse.de>, torvalds@linux-foundation.org, paulmck@kernel.org, linuxppc-dev@lists.ozlabs.org, rostedt@goodmis.org, bhelgaas@google.com, kurt.schwemmer@microsemi.com, kvalo@codeaurora.org, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, oleg@redhat.com, netdev@vger.kernel.org, logang@deltatee.com, davem@davemloft.net Subject: [PATCH 17/15] rcuwait: Inform rcuwait_wake_up() users if a wakeup was attempted Date: Fri, 20 Mar 2020 01:55:25 -0700 [thread overview] Message-ID: <20200320085527.23861-2-dave@stgolabs.net> (raw) In-Reply-To: <20200320085527.23861-1-dave@stgolabs.net> Let the caller know if wake_up_process() was actually called or not; some users can use this information for ad-hoc. Of course returning true does not guarantee that wake_up_process() actually woke anything up. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> --- include/linux/rcuwait.h | 2 +- kernel/exit.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h index 6e8798458091..3f83b9a12ad3 100644 --- a/include/linux/rcuwait.h +++ b/include/linux/rcuwait.h @@ -24,7 +24,7 @@ static inline void rcuwait_init(struct rcuwait *w) w->task = NULL; } -extern void rcuwait_wake_up(struct rcuwait *w); +extern bool rcuwait_wake_up(struct rcuwait *w); /* * The caller is responsible for locking around rcuwait_wait_event(), diff --git a/kernel/exit.c b/kernel/exit.c index 6cc6cc485d07..b0bb0a8ec4b1 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -234,9 +234,10 @@ void release_task(struct task_struct *p) goto repeat; } -void rcuwait_wake_up(struct rcuwait *w) +bool rcuwait_wake_up(struct rcuwait *w) { struct task_struct *task; + bool ret = false; rcu_read_lock(); @@ -254,10 +255,15 @@ void rcuwait_wake_up(struct rcuwait *w) smp_mb(); /* (B) */ task = rcu_dereference(w->task); - if (task) + if (task) { wake_up_process(task); + ret = true; + } rcu_read_unlock(); + + return ret; } +EXPORT_SYMBOL_GPL(rcuwait_wake_up); /* * Determine if a process group is "orphaned", according to the POSIX -- 2.16.4
next prev parent reply other threads:[~2020-03-20 8:56 UTC|newest] Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-18 20:43 [patch V2 00/15] Lock ordering documentation and annotation for lockdep Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 01/15] PCI/switchtec: Fix init_completion race condition with poll_wait() Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 21:25 ` Bjorn Helgaas 2020-03-18 21:25 ` Bjorn Helgaas 2020-03-18 20:43 ` [patch V2 02/15] pci/switchtec: Replace completion wait queue usage for poll Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 21:26 ` Bjorn Helgaas 2020-03-18 21:26 ` Bjorn Helgaas 2020-03-18 22:11 ` Logan Gunthorpe 2020-03-18 22:11 ` Logan Gunthorpe 2020-03-18 20:43 ` [patch V2 03/15] usb: gadget: Use completion interface instead of open coding it Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 8:41 ` Greg Kroah-Hartman 2020-03-19 8:41 ` Greg Kroah-Hartman 2020-03-18 20:43 ` [patch V2 04/15] orinoco_usb: Use the regular completion interfaces Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 8:40 ` Greg Kroah-Hartman 2020-03-19 8:40 ` Greg Kroah-Hartman 2020-03-18 20:43 ` [patch V2 05/15] acpi: Remove header dependency Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 06/15] rcuwait: Add @state argument to rcuwait_wait_event() Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-20 5:36 ` Davidlohr Bueso 2020-03-20 5:36 ` Davidlohr Bueso 2020-03-20 8:45 ` Sebastian Andrzej Siewior 2020-03-20 8:45 ` Sebastian Andrzej Siewior 2020-03-20 8:58 ` Davidlohr Bueso 2020-03-20 8:58 ` Davidlohr Bueso 2020-03-20 9:48 ` [PATCH 0/5] Remove mm.h from arch/*/include/asm/uaccess.h Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 1/5] nds32: Remove mm.h from asm/uaccess.h Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 2/5] csky: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-21 11:24 ` Guo Ren 2020-03-21 11:24 ` Guo Ren 2020-03-21 12:08 ` Thomas Gleixner 2020-03-21 12:08 ` Thomas Gleixner 2020-03-21 14:11 ` Guo Ren 2020-03-21 14:11 ` Guo Ren 2020-03-20 9:48 ` [PATCH 3/5] hexagon: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 4/5] ia64: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-20 9:48 ` [PATCH 5/5] microblaze: " Sebastian Andrzej Siewior 2020-03-20 9:48 ` Sebastian Andrzej Siewior 2020-03-18 20:43 ` [patch V2 07/15] powerpc/ps3: Convert half completion to rcuwait Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-19 9:00 ` Sebastian Andrzej Siewior 2020-03-19 9:00 ` Sebastian Andrzej Siewior 2020-03-19 9:18 ` Peter Zijlstra 2020-03-19 9:18 ` Peter Zijlstra 2020-03-19 9:21 ` Davidlohr Bueso 2020-03-19 9:21 ` Davidlohr Bueso 2020-03-19 10:04 ` Christoph Hellwig 2020-03-19 10:04 ` Christoph Hellwig 2020-03-19 10:26 ` Sebastian Andrzej Siewior 2020-03-19 10:26 ` Sebastian Andrzej Siewior 2020-03-20 0:01 ` Geoff Levand 2020-03-20 0:01 ` Geoff Levand 2020-03-20 0:45 ` Michael Ellerman 2020-03-20 0:45 ` Michael Ellerman 2020-03-21 10:41 ` Thomas Gleixner 2020-03-21 10:41 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 08/15] Documentation: Add lock ordering and nesting documentation Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 22:31 ` Paul E. McKenney 2020-03-18 22:31 ` Paul E. McKenney 2020-03-19 18:02 ` Thomas Gleixner 2020-03-19 18:02 ` Thomas Gleixner 2020-03-20 16:01 ` Paul E. McKenney 2020-03-20 16:01 ` Paul E. McKenney 2020-03-20 19:51 ` Thomas Gleixner 2020-03-20 19:51 ` Thomas Gleixner 2020-03-20 21:02 ` Paul E. McKenney 2020-03-20 21:02 ` Paul E. McKenney 2020-03-20 22:36 ` Thomas Gleixner 2020-03-20 22:36 ` Thomas Gleixner 2020-03-21 2:29 ` Paul E. McKenney 2020-03-21 2:29 ` Paul E. McKenney 2020-03-21 10:26 ` Thomas Gleixner 2020-03-21 10:26 ` Thomas Gleixner 2020-03-21 17:23 ` Paul E. McKenney 2020-03-21 17:23 ` Paul E. McKenney 2020-03-19 8:51 ` Davidlohr Bueso 2020-03-19 8:51 ` Davidlohr Bueso 2020-03-19 15:04 ` Jonathan Corbet 2020-03-19 15:04 ` Jonathan Corbet 2020-03-19 18:04 ` Thomas Gleixner 2020-03-19 18:04 ` Thomas Gleixner 2020-03-21 21:21 ` Joel Fernandes 2020-03-21 21:21 ` Joel Fernandes 2020-03-21 21:49 ` Thomas Gleixner 2020-03-21 21:49 ` Thomas Gleixner 2020-03-22 1:36 ` Joel Fernandes 2020-03-22 1:36 ` Joel Fernandes 2020-03-18 20:43 ` [patch V2 09/15] timekeeping: Split jiffies seqlock Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 10/15] sched/swait: Prepare usage in completions Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 20:43 ` [patch V2 11/15] completion: Use simple wait queues Thomas Gleixner 2020-03-18 20:43 ` Thomas Gleixner 2020-03-18 22:28 ` Logan Gunthorpe 2020-03-18 22:28 ` Logan Gunthorpe 2020-03-19 0:33 ` Joel Fernandes 2020-03-19 0:33 ` Joel Fernandes 2020-03-19 0:44 ` Thomas Gleixner 2020-03-19 0:44 ` Thomas Gleixner 2020-03-19 8:42 ` Greg Kroah-Hartman 2020-03-19 8:42 ` Greg Kroah-Hartman 2020-03-19 17:12 ` Linus Torvalds 2020-03-19 17:12 ` Linus Torvalds 2020-03-19 23:25 ` Julian Calaby 2020-03-19 23:25 ` Julian Calaby 2020-03-20 6:59 ` Christoph Hellwig 2020-03-20 6:59 ` Christoph Hellwig 2020-03-20 9:01 ` Davidlohr Bueso 2020-03-20 9:01 ` Davidlohr Bueso 2020-03-18 20:43 ` [patch V2 13/15] lockdep: Add hrtimer context tracing bits Thomas Gleixner 2020-03-18 20:43 ` [patch V2 14/15] lockdep: Annotate irq_work Thomas Gleixner 2020-03-18 20:43 ` [patch V2 15/15] lockdep: Add posixtimer context tracing bits Thomas Gleixner 2020-03-20 8:50 ` [patch V2 00/15] Lock ordering documentation and annotation for lockdep Davidlohr Bueso 2020-03-20 8:50 ` Davidlohr Bueso 2020-03-20 8:55 ` [PATCH 16/15] rcuwait: Get rid of stale name comment Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso [this message] 2020-03-20 8:55 ` [PATCH 17/15] rcuwait: Inform rcuwait_wake_up() users if a wakeup was attempted Davidlohr Bueso 2020-03-20 9:13 ` Sebastian Andrzej Siewior 2020-03-20 9:13 ` Sebastian Andrzej Siewior 2020-03-20 10:44 ` Peter Zijlstra 2020-03-20 10:44 ` Peter Zijlstra 2020-03-20 8:55 ` [PATCH 18/15] kvm: Replace vcpu->swait with rcuwait Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 11:20 ` Paolo Bonzini 2020-03-20 11:20 ` Paolo Bonzini 2020-03-20 12:54 ` Peter Zijlstra 2020-03-20 12:54 ` Peter Zijlstra 2020-03-22 16:33 ` Davidlohr Bueso 2020-03-22 16:33 ` Davidlohr Bueso 2020-03-22 22:32 ` Peter Zijlstra 2020-03-22 22:32 ` Peter Zijlstra 2020-03-20 8:55 ` [PATCH 19/15] sched/swait: Reword some of the main description Davidlohr Bueso 2020-03-20 8:55 ` Davidlohr Bueso 2020-03-20 9:19 ` Sebastian Andrzej Siewior 2020-03-20 9:19 ` Sebastian Andrzej Siewior
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