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| author |   Thomas Gleixner <tglx@linutronix.de> | 2017-04-12 22:07:28 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-04-15 12:20:53 +0200 |
| commit | 0e8d6a9336b487a1dd6f1991ff376e669d4c87c6 (patch) | |
| tree | 11bf45da14998976aeb13623f52673b64af35177 /include/linux/workqueue.h | |
| parent | ia64/topology: Remove cpus_allowed manipulation (diff) | |
| download | wireguard-linux-0e8d6a9336b487a1dd6f1991ff376e669d4c87c6.tar.xz wireguard-linux-0e8d6a9336b487a1dd6f1991ff376e669d4c87c6.zip | |
workqueue: Provide work_on_cpu_safe()
work_on_cpu() is not protected against CPU hotplug. For code which requires
to be either executed on an online CPU or to fail if the CPU is not
available the callsite would have to protect against CPU hotplug.
Provide a function which does get/put_online_cpus() around the call to
work_on_cpu() and fails the call with -ENODEV if the target CPU is not
online.
Preparatory patch to convert several racy task affinity manipulations.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/20170412201042.262610721@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/workqueue.h')
| -rw-r--r-- | include/linux/workqueue.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index bde063cefd04..c102ef65cb64 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -608,8 +608,13 @@ static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg) { return fn(arg); } +static inline long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg) +{ + return fn(arg); +} #else long work_on_cpu(int cpu, long (*fn)(void *), void *arg); +long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg); #endif /* CONFIG_SMP */ #ifdef CONFIG_FREEZER |