linux-kernel - Re: [PATCH v4 2/5] vduse: Use memcpy_{to,from}_page() in do

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Date:   Fri, 29 Jul 2022 10:33:22 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Xie Yongji <xieyongji@...edance.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, xiaodong.liu@...el.com,
        maxime.coquelin@...hat.com, stefanha@...hat.com,
        virtualization@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/5] vduse: Use memcpy_{to,from}_page() in do_bounce()

On Thu, Jul 28, 2022 at 11:20 AM Xie Yongji <xieyongji@...edance.com> wrote:
>
> kmap_atomic() is being deprecated in favor of kmap_local_page().
>
> The use of kmap_atomic() in do_bounce() is all thread local therefore
> kmap_local_page() is a sufficient replacement.
>
> Convert to kmap_local_page() but, instead of open coding it,
> use the helpers memcpy_to_page() and memcpy_from_page().
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> Acked-by: Jason Wang <jasowang@...hat.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>