linux-kernel - Re: New warnings with gcc-11

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Date:   Wed, 28 Apr 2021 10:27:07 +0300
From:   Jani Nikula <jani.nikula@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Airlie <airlied@...il.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: New warnings with gcc-11

On Tue, 27 Apr 2021, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> I've updated to Fedora 34 on one of my machines, and it causes a lot
> of i915 warnings like
>
>   drivers/gpu/drm/i915/intel_pm.c: In function ‘ilk_setup_wm_latency’:
>   drivers/gpu/drm/i915/intel_pm.c:3059:9: note: referencing argument 3
> of type ‘const u16 *’ {aka ‘const short unsigned int *’}
>   drivers/gpu/drm/i915/intel_pm.c:2994:13: note: in a call to function
> ‘intel_print_wm_latency’
>
> and the reason is that gcc now seems to look at the argument array
> size more, and notices that

Arnd Bergmann reported some of these a while back. I think we have some
of them fixed in our -next already, but not all. Thanks for the
reminder.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center