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

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Date:   Sat, 26 Jan 2019 17:09:11 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Nathan Chancellor <natechancellor@...il.com>,
        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>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2] drm/i915: Disable -Wuninitialized

Quoting Nathan Chancellor (2019-01-26 07:57:49)
> 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>

Ignorance is bliss. Applied to dinq, thanks!
-Chris