On Thu, 27 Jan 2011 10:43:39 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> --- mmotm-0125.orig/kernel/res_counter.c
> +++ mmotm-0125/kernel/res_counter.c
> @@ -126,10 +126,24 @@ ssize_t res_counter_read(struct res_coun
> pos, buf, s - buf);
> }
>
> +#if BITS_PER_LONG == 32
> +u64 res_counter_read_u64(struct res_counter *counter, int member)
> +{
> + unsigned long flags;
> + u64 ret;
> +
> + spin_lock_irqsave(&counter->lock, flags);
> + ret = *res_counter_member(counter, member);
> + spin_unlock_irqrestore(&counter->lock, flags);
> +
> + return ret;
> +}
> +#else
> u64 res_counter_read_u64(struct res_counter *counter, int member)
> {
> return *res_counter_member(counter, member);
> }
> +#endif
_irqsave is only needed if the lock will be taken from irq context.
Does that happen?
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