powerpc/xmon: Reapply "Relax frame size for clang"

This is a manual revert of commit 7f3c5d0 ("Revert "powerpc/xmon: Relax frame size for clang"") but using ccflags-$(CONFIG_CC_IS_CLANG) which is shorter. Turns out that this is reproducible still under specific compiler versions (mea culpa: I did not test every supported version of clang), and even a few randconfigs bots found. We'll have to revisit this again in the future, for now back this out. Reported-by: Nathan Chancellor <[email protected]> Closes: ClangBuiltLinux#252 (comment) Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/llvm/[email protected]/ Suggested-by: Nathan Chancellor <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Nick Desaulniers <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://msgid.link/[email protected]
Dcthking · Aug 29, 2023 · 90bae4d · 90bae4d
1 parent 4c33bf1
commit 90bae4d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
@@ -12,6 +12,10 @@ ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
 
 ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
 
+# Clang stores addresses on the stack causing the frame size to blow
+# out. See https://github.com/ClangBuiltLinux/linux/issues/252
+ccflags-$(CONFIG_CC_IS_CLANG) += -Wframe-larger-than=4096
+
 obj-y			+= xmon.o nonstdio.o spr_access.o xmon_bpts.o
 
 ifdef CONFIG_XMON_DISASSEMBLY