git.ipfire.org Git - thirdparty/kernel/stable-queue.git/blob

   1 From 10117450735c7a7c0858095fb46a860e7037cb9a Mon Sep 17 00:00:00 2001
   2 From: "ndesaulniers@google.com" <ndesaulniers@google.com>
   3 Date: Thu, 24 Jan 2019 16:52:59 -0800
   4 Subject: drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines
   5
   6 From: ndesaulniers@google.com <ndesaulniers@google.com>
   7
   8 commit 10117450735c7a7c0858095fb46a860e7037cb9a upstream.
   9
  10 arch/x86/Makefile disables SSE and SSE2 for the whole kernel.  The
  11 AMDGPU drivers modified in this patch re-enable SSE but not SSE2.  Turn
  12 on SSE2 to support emitting double precision floating point instructions
  13 rather than calls to non-existent (usually available from gcc_s or
  14 compiler_rt) floating point helper routines.
  15
  16 Link: https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html
  17 Link: https://github.com/ClangBuiltLinux/linux/issues/327
  18 Cc: stable@vger.kernel.org # 4.19
  19 Reported-by: S, Shirish <Shirish.S@amd.com>
  20 Reported-by: Matthias Kaehlcke <mka@google.com>
  21 Suggested-by: James Y Knight <jyknight@google.com>
  22 Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
  23 Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
  24 Tested-by: Guenter Roeck <linux@roeck-us.net>
  25 Tested-by:  Matthias Kaehlcke <mka@chromium.org>
  26 Tested-by: Nathan Chancellor <natechancellor@gmail.com>
  27 Reviewed-by: Harry Wentland <harry.wentland@amd.com>
  28 Signed-off-by: Harry Wentland <harry.wentland@amd.com>
  29 Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
  30 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  31
  32 ---
  33  drivers/gpu/drm/amd/display/dc/calcs/Makefile |    2 +-
  34  drivers/gpu/drm/amd/display/dc/dml/Makefile   |    2 +-
  35  2 files changed, 2 insertions(+), 2 deletions(-)
  36
  37 --- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
  38 +++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
  39 @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-al
  40         cc_stack_align := -mstack-alignment=16
  41  endif
  42
  43 -calcs_ccflags := -mhard-float -msse $(cc_stack_align)
  44 +calcs_ccflags := -mhard-float -msse -msse2 $(cc_stack_align)
  45
  46  CFLAGS_dcn_calcs.o := $(calcs_ccflags)
  47  CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
  48 --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
  49 +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
  50 @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-al
  51         cc_stack_align := -mstack-alignment=16
  52  endif
  53
  54 -dml_ccflags := -mhard-float -msse $(cc_stack_align)
  55 +dml_ccflags := -mhard-float -msse -msse2 $(cc_stack_align)
  56
  57  CFLAGS_display_mode_lib.o := $(dml_ccflags)
  58  CFLAGS_display_pipe_clocks.o := $(dml_ccflags)