From: Nathan Chancellor <natechancellor@gmail.com>
To: ndesaulniers@google.com
Cc: airlied@linux.ie, daniel@ffwll.ch, stable@vger.kernel.org,
S@google.com, Shirish <Shirish.S@amd.com>,
"Matthias Kaehlcke" <mka@google.com>,
"James Y Knight" <jyknight@google.com>,
"Guenter Roeck" <linux@roeck-us.net>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David (ChunMing) Zhou" <David1.Zhou@amd.com>,
"Matthias Kaehlcke" <mka@chromium.org>,
"Michel Dänzer" <michel.daenzer@amd.com>,
"Tony Cheng" <Tony.Cheng@amd.com>,
"Dmytro Laktyushkin" <Dmytro.Laktyushkin@amd.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines
Date: Thu, 24 Jan 2019 18:21:03 -0700 [thread overview]
Message-ID: <20190125012103.GA20106@archlinux-ryzen> (raw)
In-Reply-To: <20190125005304.183322-1-ndesaulniers@google.com>
On Thu, Jan 24, 2019 at 04:52:59PM -0800, ndesaulniers@google.com wrote:
> arch/x86/Makefile disables SSE and SSE2 for the whole kernel. The
> AMDGPU drivers modified in this patch re-enable SSE but not SSE2. Turn
> on SSE2 to support emitting double precision floating point instructions
> rather than calls to non-existent (usually available from gcc_s or
> compiler_rt) floating point helper routines.
>
> Link: https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html
> Link: https://github.com/ClangBuiltLinux/linux/issues/327
> Cc: stable@vger.kernel.org # 4.19
> Reported-by: S, Shirish <Shirish.S@amd.com>
> Reported-by: Matthias Kaehlcke <mka@google.com>
> Suggested-by: James Y Knight <jyknight@google.com>
> Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> Tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
> ---
> drivers/gpu/drm/amd/display/dc/calcs/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dml/Makefile | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> index 95f332ee3e7e..dc85a3c088af 100644
> --- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-alignment=16),)
> cc_stack_align := -mstack-alignment=16
> endif
>
> -calcs_ccflags := -mhard-float -msse $(cc_stack_align)
> +calcs_ccflags := -mhard-float -msse -msse2 $(cc_stack_align)
>
> CFLAGS_dcn_calcs.o := $(calcs_ccflags)
> CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> index d97ca6528f9d..33c7d7588712 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-alignment=16),)
> cc_stack_align := -mstack-alignment=16
> endif
>
> -dml_ccflags := -mhard-float -msse $(cc_stack_align)
> +dml_ccflags := -mhard-float -msse -msse2 $(cc_stack_align)
>
> CFLAGS_display_mode_lib.o := $(dml_ccflags)
> CFLAGS_display_pipe_clocks.o := $(dml_ccflags)
> --
> 2.20.1.321.g9e740568ce-goog
>
next prev parent reply other threads:[~2019-01-25 1:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 0:52 [PATCH] drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines ndesaulniers
2019-01-25 1:03 ` Matthias Kaehlcke
2019-01-25 1:21 ` Nathan Chancellor [this message]
2019-01-25 15:29 ` Wentland, Harry
2019-01-29 15:30 ` Alex Deucher
2019-01-29 18:56 ` Guenter Roeck
2019-01-29 19:01 ` Wentland, Harry
2019-01-29 19:10 ` Nick Desaulniers
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