s390/boot: Add -Wno-default-const-init-unsafe to KBUILD_CFLAGS

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>

diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 490167faba7a4312ae1c2eca12c75dfdea221bd5..a1e719a79d38cf85f22c7aaa702ddf42e74ea014 100644 (file)
--- 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