linux-kernel - Re: [PATCH v3 2/2] virtio_balloon: replace oom notifier with shrinker

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Message-ID: <16c56ee5-eef7-dd5f-f2b6-e3c11df2765c@i-love.sakura.ne.jp>
Date:   Fri, 3 Aug 2018 21:11:09 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Wei Wang <wei.w.wang@...el.com>, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        mst@...hat.com, mhocko@...nel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v3 2/2] virtio_balloon: replace oom notifier with shrinker

On 2018/08/03 17:32, Wei Wang wrote:
> +static int virtio_balloon_register_shrinker(struct virtio_balloon *vb)
> +{
> +	vb->shrinker.scan_objects = virtio_balloon_shrinker_scan;
> +	vb->shrinker.count_objects = virtio_balloon_shrinker_count;
> +	vb->shrinker.batch = 0;
> +	vb->shrinker.seeks = DEFAULT_SEEKS;

Why flags field is not set? If vb is allocated by kmalloc(GFP_KERNEL)
and is nowhere zero-cleared, KASAN would complain it.

> +
> +	return register_shrinker(&vb->shrinker);
> +}