linux-kernel - Re: [PATCH 4/6] drm/amd/display: fix dcn21 Makefile for clang

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Date:   Wed, 2 Oct 2019 16:51:09 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>
Subject: Re: [PATCH 4/6] drm/amd/display: fix dcn21 Makefile for clang

On Wed, Oct 2, 2019 at 4:17 PM Alex Deucher <alexdeucher@...il.com> wrote:
>
> I'm getting an error with gcc with this patch:
>   CC [M]  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.o
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.c: In
> function ‘calculate_wm_set_for_vlevel’:
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.c:964:22:
> error: SSE register return with SSE disabled

I checked again with gcc-8, but do not see that error message.

> > -CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
> > +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse $(cc_stack_align)

Nothing should really change with regards to the -msse flag here, only
the stack alignment flag changed. Maybe there was some other change
in your Makefile that conflicts with my my patch?

       Arnd