From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, James Hogan <james.hogan@imgtec.com>, <linux-metag@vger.kernel.org> Subject: [PATCH tip/core/rcu 04/20] metag: Use common outgoing-CPU-notification code Date: Tue, 3 Mar 2015 09:42:59 -0800 [thread overview] Message-ID: <1425404595-17816-4-git-send-email-paulmck@linux.vnet.ibm.com> (raw) In-Reply-To: <1425404595-17816-1-git-send-email-paulmck@linux.vnet.ibm.com> From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> This commit removes the open-coded CPU-offline notification with new common code. This change avoids calling scheduler code using RCU from an offline CPU that RCU is ignoring. This commit is compatible with the existing code in not checking for timeout during a prior offline for a given CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: <linux-metag@vger.kernel.org> --- arch/metag/kernel/smp.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c index f006d2276f40..ac3a199e33e7 100644 --- a/arch/metag/kernel/smp.c +++ b/arch/metag/kernel/smp.c @@ -261,7 +261,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) } #ifdef CONFIG_HOTPLUG_CPU -static DECLARE_COMPLETION(cpu_killed); /* * __cpu_disable runs on the processor to be shutdown. @@ -299,7 +298,7 @@ int __cpu_disable(void) */ void __cpu_die(unsigned int cpu) { - if (!wait_for_completion_timeout(&cpu_killed, msecs_to_jiffies(1))) + if (!cpu_wait_death(cpu, 1)) pr_err("CPU%u: unable to kill\n", cpu); } @@ -314,7 +313,7 @@ void cpu_die(void) local_irq_disable(); idle_task_exit(); - complete(&cpu_killed); + (void)cpu_report_death(); asm ("XOR TXENABLE, D0Re0,D0Re0\n"); } -- 1.8.1.5
WARNING: multiple messages have this Message-ID (diff)
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, James Hogan <james.hogan@imgtec.com>, linux-metag@vger.kernel.org Subject: [PATCH tip/core/rcu 04/20] metag: Use common outgoing-CPU-notification code Date: Tue, 3 Mar 2015 09:42:59 -0800 [thread overview] Message-ID: <1425404595-17816-4-git-send-email-paulmck@linux.vnet.ibm.com> (raw) In-Reply-To: <1425404595-17816-1-git-send-email-paulmck@linux.vnet.ibm.com> From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> This commit removes the open-coded CPU-offline notification with new common code. This change avoids calling scheduler code using RCU from an offline CPU that RCU is ignoring. This commit is compatible with the existing code in not checking for timeout during a prior offline for a given CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: <linux-metag@vger.kernel.org> --- arch/metag/kernel/smp.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c index f006d2276f40..ac3a199e33e7 100644 --- a/arch/metag/kernel/smp.c +++ b/arch/metag/kernel/smp.c @@ -261,7 +261,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) } #ifdef CONFIG_HOTPLUG_CPU -static DECLARE_COMPLETION(cpu_killed); /* * __cpu_disable runs on the processor to be shutdown. @@ -299,7 +298,7 @@ int __cpu_disable(void) */ void __cpu_die(unsigned int cpu) { - if (!wait_for_completion_timeout(&cpu_killed, msecs_to_jiffies(1))) + if (!cpu_wait_death(cpu, 1)) pr_err("CPU%u: unable to kill\n", cpu); } @@ -314,7 +313,7 @@ void cpu_die(void) local_irq_disable(); idle_task_exit(); - complete(&cpu_killed); + (void)cpu_report_death(); asm ("XOR TXENABLE, D0Re0,D0Re0\n"); } -- 1.8.1.5
next prev parent reply other threads:[~2015-03-03 17:43 UTC|newest] Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-03-03 17:41 [PATCH tip/core/rcu 0/20] CPU hotplug updates for v4.1 Paul E. McKenney 2015-03-03 17:42 ` [PATCH tip/core/rcu 01/20] smpboot: Add common code for notification from dying CPU Paul E. McKenney 2015-03-03 17:42 ` Paul E. McKenney 2015-03-03 17:42 ` [PATCH tip/core/rcu 02/20] x86: Use common outgoing-CPU-notification code Paul E. McKenney 2015-03-03 19:17 ` Boris Ostrovsky 2015-03-03 19:42 ` Paul E. McKenney 2015-03-03 19:42 ` Paul E. McKenney 2015-03-03 20:13 ` Boris Ostrovsky 2015-03-03 20:13 ` Boris Ostrovsky 2015-03-03 21:26 ` Paul E. McKenney 2015-03-03 22:06 ` Boris Ostrovsky 2015-03-03 22:31 ` Paul E. McKenney 2015-03-03 22:31 ` Paul E. McKenney 2015-03-04 14:43 ` Paul E. McKenney 2015-03-04 14:43 ` Paul E. McKenney 2015-03-04 14:55 ` Boris Ostrovsky 2015-03-04 14:55 ` Boris Ostrovsky 2015-03-04 15:25 ` Paul E. McKenney 2015-03-05 21:17 ` Boris Ostrovsky 2015-03-05 21:17 ` Boris Ostrovsky 2015-03-05 22:00 ` Paul E. McKenney 2015-03-05 22:00 ` Paul E. McKenney 2015-03-04 15:25 ` Paul E. McKenney 2015-03-04 15:45 ` David Vrabel 2015-03-04 15:45 ` David Vrabel 2015-03-04 16:10 ` Boris Ostrovsky 2015-03-04 16:10 ` Boris Ostrovsky 2015-03-03 22:06 ` Boris Ostrovsky 2015-03-03 21:26 ` Paul E. McKenney 2015-03-03 19:17 ` Boris Ostrovsky 2015-03-03 17:42 ` Paul E. McKenney 2015-03-03 17:42 ` [PATCH tip/core/rcu 03/20] blackfin: " Paul E. McKenney 2015-03-03 17:42 ` Paul E. McKenney [this message] 2015-03-03 17:42 ` [PATCH tip/core/rcu 04/20] metag: " Paul E. McKenney 2015-03-10 15:30 ` James Hogan 2015-03-10 15:30 ` James Hogan 2015-03-10 16:59 ` Paul E. McKenney 2015-03-11 11:03 ` James Hogan 2015-03-11 11:03 ` James Hogan 2015-03-11 18:58 ` Paul E. McKenney 2015-03-11 18:58 ` Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 05/20] rcu: Consolidate offline-CPU callback initialization Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 06/20] rcu: Put all orphan-callback-related code under same comment Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 07/20] rcu: Simplify sync_rcu_preempt_exp_init() Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 08/20] rcu: Eliminate empty HOTPLUG_CPU ifdef Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 09/20] rcu: Detect stalls caused by failure to propagate up rcu_node tree Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 10/20] rcu: Provide diagnostic option to slow down grace-period initialization Paul E. McKenney 2015-03-04 10:54 ` Paul Bolle 2015-03-04 14:59 ` Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 11/20] rcutorture: Enable slow grace-period initializations Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 12/20] rcu: Remove event tracing from rcu_cpu_notify(), used by offline CPUs Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 13/20] rcu: Rework preemptible expedited bitmask handling Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 14/20] rcu: Move rcu_report_unblock_qs_rnp() to common code Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 15/20] rcu: Process offlining and onlining only at grace-period start Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 16/20] rcu: Eliminate ->onoff_mutex from rcu_node structure Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 17/20] cpu: Make CPU-offline idle-loop transition point more precise Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 18/20] rcu: Handle outgoing CPUs on exit from idle loop Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 19/20] rcutorture: Default to grace-period-initialization delays Paul E. McKenney 2015-03-03 17:43 ` [PATCH tip/core/rcu 20/20] rcu: Add diagnostics to grace-period cleanup Paul E. McKenney
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