netdev - Re: [PATCH 01/64] media: omap3isp: Extract struct group for memcpy() region

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Date:   Wed, 28 Jul 2021 12:14:35 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     dsterba@...e.cz, Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Keith Packard <keithpac@...zon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-staging@...ts.linux.dev, linux-block@...r.kernel.org,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        nborisov@...e.com
Subject: Re: [PATCH 01/64] media: omap3isp: Extract struct group for memcpy()
 region

On Wed, Jul 28, 2021 at 10:59:22AM +0200, David Sterba wrote:
> >  drivers/media/platform/omap3isp/ispstat.c |  5 +--
> >  include/uapi/linux/omap3isp.h             | 44 +++++++++++++++++------
> >  2 files changed, 36 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c
> > index 5b9b57f4d9bf..ea8222fed38e 100644
> > --- a/drivers/media/platform/omap3isp/ispstat.c
> > +++ b/drivers/media/platform/omap3isp/ispstat.c
> > @@ -512,7 +512,7 @@ int omap3isp_stat_request_statistics(struct ispstat *stat,
> >  int omap3isp_stat_request_statistics_time32(struct ispstat *stat,
> >  					struct omap3isp_stat_data_time32 *data)
> >  {
> > -	struct omap3isp_stat_data data64;
> > +	struct omap3isp_stat_data data64 = { };
> 
> Should this be { 0 } ?
> 
> We've seen patches trying to switch from { 0 } to {  } but the answer
> was that { 0 } is supposed to be used,
> http://www.ex-parrot.com/~chris/random/initialise.html
> 
> (from https://lore.kernel.org/lkml/fbddb15a-6e46-3f21-23ba-b18f66e3448a@suse.com/)

In the kernel we don't care about portability so much.  Use the = { }
GCC extension.  If the first member of the struct is a pointer then
Sparse will complain about = { 0 }.

I had a patch to make checkpatch.pl complain about = { 0 }; but my
system died and I haven't transfered my postponed messages to the new
system...

regards,
dan carpenter