From dd0716c2b87792ebea30864e7ad1df461d4c1525 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Thu, 16 May 2024 12:22:40 +0200 Subject: [PATCH] x86/boot: Add a fallthrough annotation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add implicit fallthrough checking to the decompressor code and fix this warning: arch/x86/boot/printf.c: In function ‘vsprintf’: arch/x86/boot/printf.c:248:10: warning: this statement may fall through [-Wimplicit-fallthrough=] 248 | flags |= SMALL; | ^ arch/x86/boot/printf.c:249:3: note: here 249 | case 'X': | ^~~~ This is a patch from three years ago which I found in my trees, thus the SUSE authorship still. Signed-off-by: Borislav Petkov Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20240516102240.16270-1-bp@kernel.org --- arch/x86/boot/Makefile | 1 + arch/x86/boot/printf.c | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index 3cece19b7473..343aef6d752f 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -69,6 +69,7 @@ KBUILD_CFLAGS := $(REALMODE_CFLAGS) -D_SETUP KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables +KBUILD_CFLAGS += $(CONFIG_CC_IMPLICIT_FALLTHROUGH) GCOV_PROFILE := n UBSAN_SANITIZE := n diff --git a/arch/x86/boot/printf.c b/arch/x86/boot/printf.c index 1237beeb9540..c0ec1dc355ab 100644 --- a/arch/x86/boot/printf.c +++ b/arch/x86/boot/printf.c @@ -246,6 +246,7 @@ int vsprintf(char *buf, const char *fmt, va_list args) case 'x': flags |= SMALL; + fallthrough; case 'X': base = 16; break;