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powerpc/xmon: Relax frame size for clang

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When building with clang (8 trunk, 7.0 release) the frame size limit is
hit:

 arch/powerpc/xmon/xmon.c:452:12: warning: stack frame size of 2576
 bytes in function 'xmon_core' [-Wframe-larger-than=]

Some investigation by Naveen indicates this is due to clang saving the
addresses to printf format strings on the stack.

While this issue is investigated, bump up the frame size limit for xmon
when building with clang.

Link: https://github.com/ClangBuiltLinux/linux/issues/252
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Joel Stanley 2018-10-31 11:39:34 +10:30 committed by Michael Ellerman
parent a0aebae07f
commit 9c87156cce
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/xmon/Makefile
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@ -11,6 +11,12 @@ UBSAN_SANITIZE := n
ORIG_CFLAGS := $(KBUILD_CFLAGS)
KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
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