[Intel-gfx] [PATCH] drm/i915: Make DRM_I915_WERROR depend on !COMPILE_TEST

[Jani Nikula]

On Mon, 25 May 2015, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> On Mon, May 25, 2015 at 12:26:38PM +0300, Jani Nikula wrote:
>> On Mon, 25 May 2015, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>> > On Sun, May 24, 2015 at 10:48:07AM +0100, Damien Lespiau wrote:
>> >> With allyesconfig/allmodconfig, kbuild enables all the options it can,
>> >> including DRM_I915_WERROR. That's not really what we want with -Werror,
>> >> and this was breaking the build for Andrew.
>> >> 
>> >> Andrew suggested to use COMPILE_TEST as a way to 'detect' these
>> >> configurations.
>> >> 
>> >> An alternative would be to inverse the condition of the option:
>> >> DRM_I915_NO_WERROR. Setting that one to Y would have no effect, at the
>> >> price of a bit of confusion.
>> >> 
>> >> Another alternative would be to introduce a allyesmodconfig_n property
>> >> to config entries, like the allnoconfig_y one we have today:
>> >> 
>> >>   - "allnoconfig_y"
>> >>     This declares the symbol as one that should have the value y when
>> >>     using "allnoconfig". Used for symbols that hide other symbols.
>> >> 
>> >> Of course, allyesmodconfig_n would set the value to n when using
>> >> "allmodconfig" or "allmodconfig". That alternative needs a bit more work
>> >> though and may not be desirable, given that even allnoconfig_y is used
>> >> only once today.
>> >> 
>> >> Reported-by: Andrew Morton <akpm at linux-foundation.org>
>> >> Suggested-by: Andrew Morton <akpm at linux-foundation.org>
>> >> Cc: Andrew Morton <akpm at linux-foundation.org>
>> >> Cc: Chris Wilson <chris at chris-wilson.co.uk>
>> >> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
>> >
>> > As a proxy, it seems reasonable.
>> > Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
>> >
>> > Do you also have a patch for the broken code? :)
>> 
>> One of the things I looked at was the compiler being silly.
>
> We shr a 32bit constant by 32 bits, the compiler warning is
> genuine.

I meant

gcc-4.4.4:

cc1: warnings being treated as errors
drivers/gpu/drm/i915/intel_tv.c: In function 'intel_tv_detect':
drivers/gpu/drm/i915/intel_tv.c:1319: error: 'type' may be used uninitialized in this function

Jani.


> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre

-- 
Jani Nikula, Intel Open Source Technology Center