s390: disable -Warray-bounds
authorSven Schnelle <svens@linux.ibm.com>
Mon, 25 Apr 2022 12:17:42 +0000 (14:17 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 18 May 2022 08:26:52 +0000 (10:26 +0200)
[ Upstream commit 8b202ee218395319aec1ef44f72043e1fbaccdd6 ]

gcc-12 shows a lot of array bound warnings on s390. This is caused
by the S390_lowcore macro which uses a hardcoded address of 0.

Wrapping that with absolute_pointer() works, but gcc no longer knows
that a 12 bit displacement 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 gcc-12 for the time being, until
there is a better solution.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://lore.kernel.org/r/yt9dzgkelelc.fsf@linux.ibm.com
Link: https://lore.kernel.org/r/20220422134308.1613610-1-svens@linux.ibm.com
Link: https://lore.kernel.org/r/20220425121742.3222133-1-svens@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
arch/s390/Makefile

index d4fd142..c7b7a60 100644 (file)
@@ -32,6 +32,16 @@ KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
+
+ifdef CONFIG_CC_IS_GCC
+       ifeq ($(call cc-ifversion, -ge, 1200, y), y)
+               ifeq ($(call cc-ifversion, -lt, 1300, y), y)
+                       KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
+                       KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
+               endif
+       endif
+endif
+
 UTS_MACHINE    := s390x
 STACK_SIZE     := $(if $(CONFIG_KASAN),65536,16384)
 CHECKFLAGS     += -D__s390__ -D__s390x__