spinlock is necessary when someone changes res->counter value.
splited out from YAMAMOTO's background page reclaim for memory cgroup set.
Changelog v1 -> v2:
- fixed type of "flags".
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
From: YAMAMOTO Takashi <yamamoto@xxxxxxxxxxxxx>
kernel/res_counter.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6.24-rc3-mm2/kernel/res_counter.c
===================================================================
--- linux-2.6.24-rc3-mm2.orig/kernel/res_counter.c
+++ linux-2.6.24-rc3-mm2/kernel/res_counter.c
@@ -98,6 +98,7 @@ ssize_t res_counter_write(struct res_cou
{
int ret;
char *buf, *end;
+ unsigned long flags;
unsigned long long tmp, *val;
buf = kmalloc(nbytes + 1, GFP_KERNEL);
@@ -121,9 +122,10 @@ ssize_t res_counter_write(struct res_cou
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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