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Subject: Re: [PATCH] s390: disable -Warray-bounds
From:   Philipp Zabel <p.zabel@pengutronix.de>
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        David Howells <dhowells@redhat.com>
Cc:     Sven Schnelle <svens@linux.ibm.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Date:   Thu, 09 Jun 2022 11:56:14 +0200
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Hi Linus,

On Mi, 2022-06-08 at 16:59 -0700, Linus Torvalds wrote:
> On Wed, Jun 8, 2022 at 2:33 PM Kees Cook <keescook@chromium.org> wrote:
> > 
> > I and others have been working through a bunch of them, though yes,
> > they're not all fixed yet. I've been trying to track it here[1], but
> > many of those fixes are only in -next.
> 
> Hmm. Even with that disabled, I get a few warnings I *really* would
> want to get rid of.
> 
> The one in ipuv3-crtc.c seems valid about "address used as boolean is
> always true".
> 
> The 'dangling-pointer' warning does seem interesting, but not when the
> compiler does as bad a job as gcc seems to do.
> 
> See the attached patch for
> 
>  (a) make the s390 "use -Wno-array-bounds for gcc-12" be generic
> 
>  (b) fix the ipuv3-crtc.c one. IMX people?

Thank you, this fix clearly matches the original intention.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

The mistake had no adverse effect since the following condition doesn't
actually dereference the NULL pointer, but given the compiler warning
this

Fixes: eb8c88808c83 ("drm/imx: add deferred plane disabling")

regards
Philipp