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BACKPORT: drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines

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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:  Matthias Kaehlcke <mka@chromium.org>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Change-Id: I653676f209c85d1c27c91af1c9347ee59107b04f
(cherry picked from commit 1011745073)
[ added CONFIG_CC_IS_CLANG ]
Link: https://bugs.freedesktop.org/show_bug.cgi?id=109487
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
ndesaulniers@google.com
2019-01-24 16:52:59 -08:00
committed by Alistair Strachan
parent 3215ed434b
commit 8f83e6e6b2
2 changed files with 12 additions and 0 deletions
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6
drivers/gpu/drm/amd/display/dc/calcs/Makefile
View File

@@ -32,6 +32,12 @@ endif
calcs_ccflags := -mhard-float -msse $(cc_stack_align)
# Use -msse2 only with clang:
# https://bugs.freedesktop.org/show_bug.cgi?id=109487
ifdef CONFIG_CC_IS_CLANG
calcs_cc_flags += -msse2
endif
CFLAGS_dcn_calcs.o := $(calcs_ccflags)
CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
CFLAGS_dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare

6
drivers/gpu/drm/amd/display/dc/dml/Makefile
View File

@@ -32,6 +32,12 @@ endif
dml_ccflags := -mhard-float -msse $(cc_stack_align)
# Use -msse2 only with clang:
# https://bugs.freedesktop.org/show_bug.cgi?id=109487
ifdef CONFIG_CC_IS_CLANG
dml_ccflags += -msse2
endif
CFLAGS_display_mode_lib.o := $(dml_ccflags)
CFLAGS_display_pipe_clocks.o := $(dml_ccflags)
CFLAGS_dml1_display_rq_dlg_calc.o := $(dml_ccflags)