]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
kconfig: Add support for -Wimplicit-fallthrough
authorGustavo A. R. Silva <gustavoars@kernel.org>
Sun, 14 Nov 2021 00:57:25 +0000 (18:57 -0600)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 14 Nov 2021 21:27:30 +0000 (13:27 -0800)
commitdee2b702bcf067d7b6b62c18bdd060ff0810a800
tree53daf07f8ded4a59038ee0265bcc3f094a6e43b8
parentce49bfc8d0372212ccd7d1c1b45c60b077f77684
kconfig: Add support for -Wimplicit-fallthrough

Add Kconfig support for -Wimplicit-fallthrough for both GCC and Clang.

The compiler option is under configuration CC_IMPLICIT_FALLTHROUGH,
which is enabled by default.

Special thanks to Nathan Chancellor who fixed the Clang bug[1][2]. This
bugfix only appears in Clang 14.0.0, so older versions still contain
the bug and -Wimplicit-fallthrough won't be enabled for them, for now.

This concludes a long journey and now we are finally getting rid
of the unintentional fallthrough bug-class in the kernel, entirely. :)

Link: https://github.com/llvm/llvm-project/commit/9ed4a94d6451046a51ef393cd62f00710820a7e8
Link: https://bugs.llvm.org/show_bug.cgi?id=51094
Link: https://github.com/KSPP/linux/issues/115
Link: https://github.com/ClangBuiltLinux/linux/issues/236
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Makefile
init/Kconfig