linux-kernel - Re: [PATCH v3] media: add virtio-media driver

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Message-ID: <CANiDSCt9nGP=r8VxkZH76a1i+xEd+RCJ71=6qx0_iPYdrn+GoQ@mail.gmail.com>
Date: Sun, 1 Jun 2025 12:01:22 +0200
From: Ricardo Ribalda <ribalda@...omium.org>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: Alexandre Courbot <gnurou@...il.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
	Hans Verkuil <hverkuil@...all.nl>, Albert Esteve <aesteve@...hat.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez <eperezma@...hat.com>, 
	gurchetansingh@...gle.com, daniel.almeida@...labora.com, adelva@...gle.com, 
	changyeon@...gle.com, nicolas.dufresne@...labora.com, 
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	virtualization@...ts.linux.dev, Alexandre Courbot <acourbot@...gle.com>
Subject: Re: [PATCH v3] media: add virtio-media driver

Hi Mauro

On Sun, 1 Jun 2025 at 11:34, Mauro Carvalho Chehab
<mchehab+huawei@...nel.org> wrote:
>
> Em Wed, 28 May 2025 18:23:02 +0200
> Ricardo Ribalda <ribalda@...omium.org> escreveu:
>
> > > +static int scatterlist_builder_add_userptr(struct scatterlist_builder *builder,
> > > +                                          unsigned long userptr,
> > > +                                          unsigned long length)
> > > +{
> > > +       int ret;
> > > +       int nents;
> > Could you initialize nents and sg_list?
> > old versions of gcc are a bit picky
> > https://gitlab.freedesktop.org/linux-media/users/ribalda/-/jobs/77042562#L4381
>
> Please don't. In this specific case, ret is always initialized:
>
> > +       struct virtio_media_sg_entry *sg_list;
> > +
> > +       ret = __scatterlist_builder_add_userptr(builder, userptr, length,
> > +                                               &sg_list, &nents);
>
> nents and sg_list may or may not be initialized at the function,
> but initializing it is wrong, as, when they are not initialized, the
> ret code shall catch it (and if not, we *do* want gcc to warn).
>
> So, if our CI is warning about that due to an old version, please upgrade
> the version at the CI runner.

The main version of gcc works fine. It is the minimal version (8.1) required by
https://www.kernel.org/doc/html/next/process/changes.html
that  complains.



>
> Regards,
> Mauro
>
>
> Thanks,
> Mauro



-- 
Ricardo Ribalda