kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

percpu_counter: percpu_counter_hotcpu_callback() cleanup

Browse source 
In commit ebd8fef304 ("percpu_counter: make percpu_counters_lock
irq-safe") we disabled irqs in percpu_counter_hotcpu_callback()

We can grab every counter spinlock without having to disable
irqs again.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Eric Dumazet 2017-01-20 06:34:22 -08:00 committed by Tejun Heo
parent 44b4b461a0
commit aaf0f2fa68
1 changed files with 2 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
lib/percpu_counter.c
View file

@ -176,13 +176,12 @@ static int percpu_counter_cpu_dead(unsigned int cpu)
spin_lock_irq(&percpu_counters_lock);
list_for_each_entry(fbc, &percpu_counters, list) {
s32 *pcount;
unsigned long flags;
raw_spin_lock_irqsave(&fbc->lock, flags);
raw_spin_lock(&fbc->lock);
pcount = per_cpu_ptr(fbc->counters, cpu);
fbc->count += *pcount;
*pcount = 0;
raw_spin_unlock_irqrestore(&fbc->lock, flags);
raw_spin_unlock(&fbc->lock);
}
spin_unlock_irq(&percpu_counters_lock);
#endif