linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: avoid harmless empty-body warning

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Date:   Tue, 8 Nov 2016 17:35:43 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: avoid harmless empty-body warning

On Tue, Nov 08, 2016 at 02:49:05PM +0000, Chris Wilson wrote:
> On Tue, Nov 08, 2016 at 02:58:17PM +0100, Arnd Bergmann wrote:
> > The newly added assert_kernel_context_is_current introduces a warning
> > when built with W=1:
> > 
> > drivers/gpu/drm/i915/i915_gem.c: In function ‘assert_kernel_context_is_current’:
> > drivers/gpu/drm/i915/i915_gem.c:4417:63: error: suggest braces around empty body in an ‘else’ statement [-Werror=empty-body]
> > 
> > Changing the GEM_BUG_ON() macro from an empty definition to "do { } while (0)"
> > makes the macro more robust to use and avoids the warning.
> > 
> > Fixes: 3033acab07f9 ("drm/i915: Queue the idling context switch after all other timelines")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>

Queued for -next, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch