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| author | Hugh Dickins <hughd@google.com> | 2014-01-16 15:26:48 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-17 11:32:24 +1100 |
| commit | d1969a84dd6a44d375aa82bba7d6c38713a429c3 (patch) | |
| tree | 26d4c1e2915dc960f28abec72d024ddbf4c57924 /lib/percpu_counter.c | |
| parent | 85ce70fdf48aa290b4845311c2dd815d7f8d1fa5 (diff) | |
| download | lwn-d1969a84dd6a44d375aa82bba7d6c38713a429c3.tar.gz lwn-d1969a84dd6a44d375aa82bba7d6c38713a429c3.zip | |
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 <hughd@google.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Fan Du <fan.du@windriver.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/percpu_counter.c')
| -rw-r--r-- | lib/percpu_counter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index 1da85bb1bc07..8280a5dd1727 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -82,7 +82,7 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) 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); |