linux-kernel - Re: [PATCH v5 0/8] xen: dma-buf support for grant device

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Date:   Mon, 23 Jul 2018 11:22:59 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>,
        Oleksandr Andrushchenko <andr2000@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com
Subject: Re: [PATCH v5 0/8] xen: dma-buf support for grant device

On 07/23/2018 09:26 AM, Oleksandr Andrushchenko wrote:
> On 07/23/2018 11:38 AM, Oleksandr Andrushchenko wrote:
>>
>>> data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c: In function
>>> ‘gntdev_ioctl_dmabuf_exp_from_refs’:
>>> /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:503:6: warning:
>>> ‘args.fd’ may be used uninitialized in this function
>>> [-Wmaybe-uninitialized]
>>>    *fd = args.fd;
>>>    ~~~~^~~~~~~~~
>>> /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:467:35: note:
>>> ‘args.fd’ was declared here
>>>    struct gntdev_dmabuf_export_args args;
>>>                                     ^~~~
>> Strangely, but my i386 build goes smooth.
>> Which version of gcc you use and could you please give me your
>> .config, so I can test the same?
> Now I see this warning which seems to be a false positive.
> Boris, could you please apply the following:
>
> diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
> index e4c9f1f74476..0680dbcba616 100644
> --- a/drivers/xen/gntdev-dmabuf.c
> +++ b/drivers/xen/gntdev-dmabuf.c
> @@ -495,6 +495,7 @@ static int dmabuf_exp_from_refs(struct gntdev_priv
> *priv, int flags,
>         args.dmabuf_priv = priv->dmabuf_priv;
>         args.count = map->count;
>         args.pages = map->pages;
> +       args.fd = -1;
>
>         ret = dmabuf_exp_from_pages(&args);
>         if (ret < 0)
>
> or please let me know if you want me to resend with this fix?


Missed this message. Yes, this obviously fixes the problem. And it is
due to the code fragment that I mentioned in the earlier response.

Which patch is this for? I can add this when committing.

-boris