KAMEZAWA Hiroyuki wrote:
> spinlock is necessary when someone changes res_counter value.
> splited out from YAMAMOTO's background page reclaim for memory cgroup set.
>
> Signed-off-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
> From: YAMAMOTO Takashi <[EMAIL PROTECTED]>
>
>
> kernel/res_counter.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> Index: linux-2.6.24-rc3-mm1/kernel/res_counter.c
> ===================================================================
> --- linux-2.6.24-rc3-mm1.orig/kernel/res_counter.c 2007-11-27
> 14:07:44.000000000 +0900
> +++ linux-2.6.24-rc3-mm1/kernel/res_counter.c 2007-11-27 14:09:40.000000000
> +0900
> @@ -98,7 +98,7 @@
> {
> int ret;
> char *buf, *end;
> - unsigned long long tmp, *val;
> + unsigned long long flags, tmp, *val;
Flags for irqsave should be unsigned long. No?
> buf = kmalloc(nbytes + 1, GFP_KERNEL);
> ret = -ENOMEM;
> @@ -121,9 +121,10 @@
> if (*end != '\0')
> goto out_free;
> }
> -
> + spin_lock_irqsave(&counter->lock, flags);
> val = res_counter_member(counter, member);
> *val = tmp;
> + spin_unlock_irqrestore(&counter->lock, flags);
> ret = nbytes;
> out_free:
> kfree(buf);
>
>
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