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From 89ebce5861f64bd3fcd1aa17d12e6d181632234e Mon Sep 17 00:00:00 2001
From: Nick Desaulniers <ndesaulniers@google.com>
Date: Wed, 16 Oct 2019 16:02:09 -0700
Subject: [PATCH 4310/4736] drm/amdgpu: enable -msse2 for GCC 7.1+ users
A final attempt at enabling sse2 for GCC users.
Orininally attempted in:
commit 10117450735c ("drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines")
Reverted due to "reported instability" in:
commit 193392ed9f69 ("Revert "drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines"")
Re-added just for Clang in:
commit 0f0727d971f6 ("drm/amd/display: readd -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines")
The original report didn't have enough information to know if the GPF
was due to misalignment, but I suspect that it was. (The missing
information was the disassembly of the function at the bottom of the
trace, to see if the instruction pointer pointed to an instruction with
16B alignment memory operand requirements. The stack trace does show
the stack was only 8B but not 16B aligned though, which makes this a
strong possibility).
Now that the stack misalignment issue has been fixed for users of GCC
7.1+, reattempt adding -msse2. This matches Clang.
It will likely never be safe to enable this for pre-GCC 7.1 AND use a
16B aligned stack in these translation units.
This is only a functional change for GCC 7.1+ users, and should be boot
tested.
Link: https://bugs.freedesktop.org/show_bug.cgi?id=109487
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/calcs/Makefile | 4 +---
drivers/gpu/drm/amd/display/dc/dcn20/Makefile | 4 +---
drivers/gpu/drm/amd/display/dc/dcn21/Makefile | 4 +---
drivers/gpu/drm/amd/display/dc/dml/Makefile | 4 +---
drivers/gpu/drm/amd/display/dc/dsc/Makefile | 4 +---
5 files changed, 5 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
index 393215ef9f98..e59a7f356188 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@ -37,9 +37,7 @@ ifdef IS_OLD_GCC
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
calcs_ccflags += -mpreferred-stack-boundary=4
-endif
-
-ifdef CONFIG_CC_IS_CLANG
+else
calcs_ccflags += -msse2
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
index d684cb912d92..be3a614963c6 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
@@ -23,9 +23,7 @@ ifdef IS_OLD_GCC
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
CFLAGS_dcn20_resource.o += -mpreferred-stack-boundary=4
-endif
-
-ifdef CONFIG_CC_IS_CLANG
+else
CFLAGS_dcn20_resource.o += -msse2
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
index 72609a40c6a3..feb7e705e792 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
@@ -16,9 +16,7 @@ ifdef IS_OLD_GCC
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
CFLAGS_dcn21_resource.o += -mpreferred-stack-boundary=4
-endif
-
-ifdef CONFIG_CC_IS_CLANG
+else
CFLAGS_dcn21_resource.o += -msse2
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index f85f2bb1b0c7..9cc2fe56ed64 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -37,9 +37,7 @@ ifdef IS_OLD_GCC
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
dml_ccflags += -mpreferred-stack-boundary=4
-endif
-
-ifdef CONFIG_CC_IS_CLANG
+else
dml_ccflags += -msse2
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/Makefile b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
index ec2ebee0078f..2fff8c1f1a78 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
@@ -14,9 +14,7 @@ ifdef IS_OLD_GCC
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
dsc_ccflags += -mpreferred-stack-boundary=4
-endif
-
-ifdef CONFIG_CC_IS_CLANG
+else
dsc_ccflags += -msse2
endif
--
2.17.1
|
