Commit cd8c917a56f2 for kernel

commit cd8c917a56f20f48748dd43d9ae3caff51d5b987
Author: Salvatore Bonaccorso <carnil@debian.org>
Date:   Mon Dec 6 21:42:01 2021 +0100

    Makefile: Do not quote value for CONFIG_CC_IMPLICIT_FALLTHROUGH

    Andreas reported that a specific build environment for an external
    module, being a bit broken, does pass CC_IMPLICIT_FALLTHROUGH quoted as
    argument to gcc, causing an error

      gcc-11: error: "-Wimplicit-fallthrough=5": linker input file not found: No such file or directory

    Until this is more generally fixed as outlined in [1], by fixing
    scripts/link-vmlinux.sh, scripts/gen_autoksyms.sh, etc to not directly
    include the include/config/auto.conf, and in a second step, change
    Kconfig to generate the auto.conf without "", workaround the issue by
    explicitly unquoting CC_IMPLICIT_FALLTHROUGH.

    Reported-by: Andreas Beckmann <anbe@debian.org>
    Link: https://bugs.debian.org/1001083
    Link: https://lore.kernel.org/linux-kbuild/CAK7LNAR-VXwHFEJqCcrFDZj+_4+Xd6oynbj_0eS8N504_ydmyw@mail.gmail.com/ [1]
    Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Makefile b/Makefile
index 8e35d7804fef..ef967a26bcd3 100644
--- a/Makefile
+++ b/Makefile
@@ -789,7 +789,7 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 KBUILD_CFLAGS += $(stackp-flags-y)

 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
-KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
+KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH:"%"=%)

 ifdef CONFIG_CC_IS_CLANG
 KBUILD_CPPFLAGS += -Qunused-arguments