Messages in this thread Patch in this message | | | From | Sven Schnelle <> | Subject | [PATCH] s390: disable -Warray-bounds | Date | Fri, 22 Apr 2022 15:43:08 +0200 |
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gcc-12 shows a lot of array bound warnings on s390. This is caused by our S390_lowcore macro:
which uses an hardcoded address of 0. Wrapping that with absolute_pointer() works, but gcc no longer knows that a 12 bit instruction is sufficient to access lowcore. So it emits instructions like 'lghi %r1,0; l %rx,xxx(%r1)' instead of a single load/store instruction. As s390 stores variables often read/written in lowcore, this is considered problematic. Therefore disable -Warray-bounds on s390 for now until there is a better real solution.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com> --- arch/s390/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/s390/Makefile b/arch/s390/Makefile index e441b60b1812..aff0f66e25fb 100644 --- a/arch/s390/Makefile +++ b/arch/s390/Makefile @@ -14,6 +14,7 @@ KBUILD_AFLAGS_MODULE += -fPIC KBUILD_CFLAGS_MODULE += -fPIC KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 +KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) ifeq ($(CONFIG_RELOCATABLE),y) KBUILD_CFLAGS += -fPIE LDFLAGS_vmlinux := -pie @@ -28,6 +29,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member) +KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,)) UTS_MACHINE := s390x -- 2.35.1
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