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Date: Mon, 6 Mar 2017 15:56:12 -0500
From: Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH 2/3] percpu: acquire pcpu_lock when updating
 pcpu_nr_empty_pop_pages
Message-ID: <20170306205612.GF26127@htj.duckdns.org>
References: <20170225210019.23610-1-tahsin@google.com>
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In-Reply-To: <20170225210019.23610-1-tahsin@google.com>
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To: Tahsin Erdogan <tahsin@google.com>
Cc: Christoph Lameter <cl@linux.com>, Andrew Morton <akpm@linux-foundation.org>, Chris Wilson <chris@chris-wilson.co.uk>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Roman Pen <r.peniaev@gmail.com>, Joonas Lahtinen <joonas.lahtinen@linux.intel.com>, Michal Hocko <mhocko@suse.com>, zijun_hu <zijun_hu@htc.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

On Sat, Feb 25, 2017 at 01:00:19PM -0800, Tahsin Erdogan wrote:
> Update to pcpu_nr_empty_pop_pages in pcpu_alloc() is currently done
> without holding pcpu_lock. This can lead to bad updates to the variable.
> Add missing lock calls.
> 
> Fixes: b539b87fed37 ("percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated")
> Signed-off-by: Tahsin Erdogan <tahsin@google.com>

Applied to percpu/for-4.11-fixes w/ stable cc'd.

Thanks.

-- 
tejun

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