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drm/amd/display: Relax DML frame limit with UBSAN

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[WHY]
UBSAN instrumentation adds checks and handler calls and increases
stack usage in the large DML calculation functions, similar to
KASAN and KCSAN. With UBSAN enabled these files exceed the default
-Wframe-larger-than limit and fail to build when -Werror is in effect.

Reproduced with LLVM (make LLVM=1, clang 19.1.1), CONFIG_UBSAN=y,
CONFIG_GCOV_PROFILE_ALL=y and CONFIG_DRM_AMDGPU_WERROR=y on x86_64.

[HOW]
Include CONFIG_UBSAN in the sanitizer check that selects the
higher per-file frame warning limit in the dml and dml2_0
Makefiles.

Suggested-by: Leo Li <sunpeng.li@amd.com>
Assisted-by: Copilot:Claude-Opus-5.5
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung 2026-09-23 11:31:18 -06:00 committed by Alex Deucher
parent f05e235a54
commit ebf8b0fd85
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/amd/display/dc/dml/Makefile
View File

@ -29,7 +29,7 @@ dml_ccflags := $(CC_FLAGS_FPU)
dml_rcflags := $(CC_FLAGS_NO_FPU)
ifneq ($(CONFIG_FRAME_WARN),0)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)$(CONFIG_UBSAN)),y)
ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_COMPILE_TEST),yy)
frame_warn_limit := 4096
else

2
drivers/gpu/drm/amd/display/dc/dml2_0/Makefile
View File

@ -28,7 +28,7 @@ dml2_ccflags := $(CC_FLAGS_FPU)
dml2_rcflags := $(CC_FLAGS_NO_FPU)
ifneq ($(CONFIG_FRAME_WARN),0)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)$(CONFIG_UBSAN)),y)
ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_COMPILE_TEST),yy)
frame_warn_limit := 4096
else