drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined...

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: [email protected] # 4.19
Reported-by: S, Shirish <[email protected]>
Reported-by: Matthias Kaehlcke <[email protected]>
Suggested-by: James Y Knight <[email protected]>
Suggested-by: Nathan Chancellor <[email protected]>
Signed-off-by: Nick Desaulniers <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Tested-by:  Matthias Kaehlcke <[email protected]>
Tested-by: Nathan Chancellor <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
index 95f332ee3e7e6e3858294d485c03c23c1c25f613..dc85a3c088afd5624b121f63d673da1cd012d0dc 100644 (file)
--- 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 d97ca6528f9d9d943f41bb416466277d2fcdf2bc..33c7d758871220c6fa4d4f32fdca4edf50e0f68c 100644 (file)
--- 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)