Clang on LoongArch (18+) appears to be unaffected by the bug causing
excessive stack usage in calculate_bandwidth(). But when building DC_FP
support the stack frame size can be as large as 2816 bytes, which causes
the FRAME_WARN build warnings. So on LoongArch we allow building DC with
clang, but disable DC_FP by default.
The help message is also updated.
Tested-by: Rui Wang <wang...@loongson.cn>
Signed-off-by: Huacai Chen <chenhua...@loongson.cn>
---
drivers/gpu/drm/amd/display/Kconfig | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/Kconfig
b/drivers/gpu/drm/amd/display/Kconfig
index df17e79c45c7..11e3f2f3b174 100644
--- a/drivers/gpu/drm/amd/display/Kconfig
+++ b/drivers/gpu/drm/amd/display/Kconfig
@@ -7,20 +7,21 @@ menu "Display Engine Configuration"
config DRM_AMD_DC
bool "AMD DC - Enable new display engine"
default y
- depends on BROKEN || !CC_IS_CLANG || ARM64 || RISCV || SPARC64 || X86_64
+ depends on BROKEN || !CC_IS_CLANG || ARM64 || LOONGARCH || RISCV ||
SPARC64 || X86_64
select SND_HDA_COMPONENT if SND_HDA_CORE
# !CC_IS_CLANG: https://github.com/ClangBuiltLinux/linux/issues/1752
- select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && !(CC_IS_CLANG &&
(ARM64 || RISCV))
+ select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && !(CC_IS_CLANG &&
(ARM64 || LOONGARCH || RISCV))
help
Choose this option if you want to use the new display engine
support for AMDGPU. This adds required support for Vega and
Raven ASICs.
- calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64
|| ARM64)
- architectures built with Clang (all released versions), whereby the
stack
- frame gets blown up to well over 5k. This would cause an immediate
kernel
- panic on most architectures. We'll revert this when the following
bug report
- has been resolved: https://github.com/llvm/llvm-project/issues/41896.
+ calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64
||
+ ARM64 || LOONGARCH || RISCV) architectures built with Clang (all
released
+ versions), whereby the stack frame gets blown up to well over 5k.
This
+ would cause an immediate kernel panic on most architectures. We'll
revert
+ this when the following bug report has been resolved:
+ https://github.com/llvm/llvm-project/issues/41896.
config DRM_AMD_DC_FP
def_bool n
--
2.43.5
