On Thu, Jan 24, 2019 at 04:52:59PM -0800, ndesaulniers@xxxxxxxxxx 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@xxxxxxxxxxxxxxx # 4.19 > Reported-by: S, Shirish <Shirish.S@xxxxxxx> > Reported-by: Matthias Kaehlcke <mka@xxxxxxxxxx> > Suggested-by: James Y Knight <jyknight@xxxxxxxxxx> > Suggested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx> > --- > 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) Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
