linux-kernel - Re: [PATCH v2] drm/i915: Disable -Wuninitialized

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Date:   Sat, 26 Jan 2019 00:57:49 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        LKML <linux-kernel@...r.kernel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2] drm/i915: Disable -Wuninitialized

On Fri, Jan 25, 2019 at 11:34:19PM -0800, Nick Desaulniers wrote:
> On Fri, Jan 25, 2019 at 11:13 PM Nathan Chancellor
> <natechancellor@...il.com> wrote:
> >
> > This warning is disabled by default in scripts/Makefile.extrawarn when
> > W= is not provided but this Makefile adds -Wall after this warning is
> > disabled so it shows up in the build when it shouldn't:
> >
> > In file included from drivers/gpu/drm/i915/intel_breadcrumbs.c:895:
> > drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c:350:34: error:
> > variable 'wq' is uninitialized when used within its own initialization
> > [-Werror,-Wuninitialized]
> >         DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
> >                                         ^~
> > ./include/linux/wait.h:74:63: note: expanded from macro
> > 'DECLARE_WAIT_QUEUE_HEAD_ONSTACK'
> >         struct wait_queue_head name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
> >                                ~~~~                                  ^~~~
> > ./include/linux/wait.h:72:33: note: expanded from macro
> > '__WAIT_QUEUE_HEAD_INIT_ONSTACK'
> >         ({ init_waitqueue_head(&name); name; })
> >                                        ^~~~
> > 1 error generated.
> >
> > Explicitly disable the warning like commit 46e2068081e9 ("drm/i915:
> > Disable some extra clang warnings").
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/220
> > Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> 
> Reviewed-by: Nick Desaulniers <nick.desaulniers@...il.com>
> 
> probably could give Chris Wilson the suggested by tag.
> https://lore.kernel.org/lkml/154513398652.1108.7150969916024071452@skylake-alporthouse-com/
> 

Ugh you're right, completely slipped my mind.

Suggested-by: Chris Wilson <chris@...is-wilson.co.uk>

> > ---
> >
> > v1 -> v2:
> >
> > * Rather than disable the warning for the problematic folder, disable it
> >   for the entire folder like Matthias's commit.
> 
> Thanks for following up with a v2.

Thank you for the review!
Nathan

> 
> -- 
> Thanks,
> ~Nick Desaulniers