[PATCH] percpu_counter: unbreak __percpu_counter_add()

[Hugh Dickins]

Commit 74e72f894d56 ("lib/percpu_counter.c: fix __percpu_counter_add()")
looked very plausible, but its arithmetic was badly wrong: obvious once
you see the fix, but maddening to get there from the weird tmpfs ENOSPCs

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---

 lib/percpu_counter.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 3.13-rc8+/lib/percpu_counter.c	2014-01-15 09:53:27.768111792 -0800
+++ linux/lib/percpu_counter.c	2014-01-16 14:58:54.156555308 -0800
@@ -82,7 +82,7 @@ void __percpu_counter_add(struct percpu_
 		unsigned long flags;
 		raw_spin_lock_irqsave(&fbc->lock, flags);
 		fbc->count += count;
-		 __this_cpu_sub(*fbc->counters, count);
+		__this_cpu_sub(*fbc->counters, count - amount);
 		raw_spin_unlock_irqrestore(&fbc->lock, flags);
 	} else {
 		this_cpu_add(*fbc->counters, amount);
--
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