netdev - Re: [PATCH v3 20/41] fbdev/pvr2fb: convert put_page() to put_user

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Message-ID: <1f1656b4-3411-3237-726f-8fb7b73ae363@samsung.com>
Date:   Fri, 9 Aug 2019 13:38:31 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     john.hubbard@...il.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
        Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Bhumika Goyal <bhumirks@...il.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>
Subject: Re: [PATCH v3 20/41] fbdev/pvr2fb: convert put_page() to
 put_user_page*()


On 8/7/19 3:33 AM, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
> 
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
> 
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
> 
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Bhumika Goyal <bhumirks@...il.com>
> Cc: Arvind Yadav <arvind.yadav.cs@...il.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-fbdev@...r.kernel.org
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/video/fbdev/pvr2fb.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
> index 7ff4b6b84282..0e4f9aa6444d 100644
> --- a/drivers/video/fbdev/pvr2fb.c
> +++ b/drivers/video/fbdev/pvr2fb.c
> @@ -700,8 +700,7 @@ static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
>  	ret = count;
>  
>  out_unmap:
> -	for (i = 0; i < nr_pages; i++)
> -		put_page(pages[i]);
> +	put_user_pages(pages, nr_pages);
>  
>  	kfree(pages);