percpu_counter: unbreak __percpu_counter_add()

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 <>
Cc: Ming Lei <>
Cc: Paul Gortmaker <>
Cc: Shaohua Li <>
Cc: Jens Axboe <>
Cc: Fan Du <>
Cc: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
1 file changed