[PATCH 6.18 043/752] s390/boot: Add -Wno-default-const-init-unsafe to KBUILD_CFLAGS

Sasha Levin
2026-02-28T17:48:45Z

From: Heiko Carstens <hca@linux.ibm.com>

[ Upstream commit 5ba35a6c13fff0929c34aba6b7602dacbe68686c ]

Add -Wno-default-const-init-unsafe to boot KBUILD_CFLAGS, similar to
scripts/Makefile.extrawarn, since clang generates warnings for the dummy
variable in typecheck():

CC arch/s390/boot/version.o
arch/s390/include/asm/ptrace.h:221:9: warning: default initialization of an object of type 'typeof (regs->psw)' (aka 'const psw_t') leaves the object uninitialized [-Wdefault-const-init-var-unsafe]
221 | return psw_bits(regs->psw).pstate;
| ^
arch/s390/include/asm/ptrace.h:98:2: note: expanded from macro 'psw_bits'
98 | typecheck(psw_t, __psw); \
| ^
include/linux/typecheck.h:11:12: note: expanded from macro 'typecheck'
11 | typeof(x) __dummy2; \
| ^

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/s390/boot/Makefile | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 02f2cf0827487..1768424a1824f 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -21,6 +21,7 @@ KBUILD_AFLAGS := $(filter-out $(CC_FLAGS_MARCH),$(KBUILD_AFLAGS_DECOMPRESSOR))
KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_MARCH),$(KBUILD_CFLAGS_DECOMPRESSOR))
KBUILD_AFLAGS += $(CC_FLAGS_MARCH_MINIMUM) -D__DISABLE_EXPORTS
KBUILD_CFLAGS += $(CC_FLAGS_MARCH_MINIMUM) -D__DISABLE_EXPORTS
+KBUILD_CFLAGS += $(call cc-option, -Wno-default-const-init-unsafe)

CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char

--
2.51.0