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

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Message-ID: <CAKwvOdmjM80XP7VH83iLn=8mz6W1+SbXST2FChEnH0LSRRm4pA@mail.gmail.com>
Date:   Wed, 2 Oct 2019 14:14:29 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Alex Deucher <alexander.deucher@....com>
Cc:     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>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        amd-gfx@...ts.freedesktop.org, LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...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 5:03 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> Just like all the other variants, this one passes invalid
> compile-time options with clang after the new code got
> merged:
>
> clang: error: unknown argument: '-mpreferred-stack-boundary=4'
> scripts/Makefile.build:265: recipe for target 'drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.o' failed
>
> Use the same variant that we have for dcn20 to fix compilation.
>
> Fixes: eced51f9babb ("drm/amd/display: Add hubp block for Renoir (v2)")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
(Though I think it's already been merged)

Alex, do you know why the AMDGPU driver uses a different stack
alignment (16B) than the rest of the x86 kernel?  (see
arch/x86/Makefile which uses 8B stack alignment).

> ---
>  drivers/gpu/drm/amd/display/dc/dcn21/Makefile | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
> index 8cd9de8b1a7a..ef673bffc241 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
> @@ -3,7 +3,17 @@
>
>  DCN21 = dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o
>
> -CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
> +ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
> +       cc_stack_align := -mpreferred-stack-boundary=4
> +else ifneq ($(call cc-option, -mstack-alignment=16),)
> +       cc_stack_align := -mstack-alignment=16
> +endif
> +
> +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse $(cc_stack_align)
> +
> +ifdef CONFIG_CC_IS_CLANG
> +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o += -msse2
> +endif
>
>  AMD_DAL_DCN21 = $(addprefix $(AMDDALPATH)/dc/dcn21/,$(DCN21))
>
> --
> 2.20.0
>
> --
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-- 
Thanks,
~Nick Desaulniers