[PATCH] Revert "Revert "powerpc/xmon: Relax frame size for clang""

[ndesaulniers]

This reverts commit 7f3c5d099b6f8452dc4dcfe4179ea48e6a13d0eb.

Turns out that this is reproducible still under specific compiler
versions (mea culpa: I did not test every supported version of clang),
and even a few randconfigs bots found.

We'll have to revisit this again in the future, for now back this out.

Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Closes: https://github.com/ClangBuiltLinux/linux/issues/252#issuecomment-1690371256
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/llvm/202308260344.Vc4Giuk7-lkp@xxxxxxxxx/
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
---
 arch/powerpc/xmon/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
index 7705aa74a24d..d334de392e6c 100644
--- a/arch/powerpc/xmon/Makefile
+++ b/arch/powerpc/xmon/Makefile
@@ -10,6 +10,12 @@ KCSAN_SANITIZE := n
 # Disable ftrace for the entire directory
 ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
 
+ifdef CONFIG_CC_IS_CLANG
+# clang stores addresses on the stack causing the frame size to blow
+# out. See https://github.com/ClangBuiltLinux/linux/issues/252
+KBUILD_CFLAGS += -Wframe-larger-than=4096
+endif
+
 ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
 
 obj-y			+= xmon.o nonstdio.o spr_access.o xmon_bpts.o

---
base-commit: 2ee82481c392eec06a7ef28df61b7f0d8e45be2e
change-id: 20230828-ppc_rerevert-647427f04ce1

Best regards,
-- 
Nick Desaulniers <ndesaulniers@xxxxxxxxxx>