Re: [PATCH] percpu-refcount: Add a WARN() for ref going negative

[Tejun Heo]

On Mon, Jan 06, 2014 at 01:13:26PM -0800, Kent Overstreet wrote:
> AIO had a missing get, which led to an ioctx leak - after percpu_ref_kill() the
> ref was 0 so percpu_ref_put() never saw it hit 0.
> 
> This wasn't noticed at the time because it all happened completely silently,
> this adds a WARN() which would've caught the aio bug.
> 
> Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>

Applied to percpu/for-3.14 w/ WARN_ONCE() instead WARN().

Thanks.

-- 
tejun
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