From: "Borislav Petkov (AMD)" <bp@xxxxxxxxx> This diagnostic checks whether there is a type mismatch when converting enums (assign an enum of type A to an enum of type B, for example) and it caught a legit issue recently. The reason it didn't show is because that warning is enabled only with -Wextra with GCC. Clang, however, enables it by default. GCC folks were considering enabling it by default but it was too noisy back then: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78736 Now that due to clang all those warnings have been fixed, enable it with GCC too. allmodconfig tests done with: x86, arm{,64}, powerpc{,64}, riscv crossbuilds. Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx> --- Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Makefile b/Makefile index 7a5a175f708f..428132b3d6dd 100644 --- a/Makefile +++ b/Makefile @@ -1082,6 +1082,9 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) # Require designated initializers for all marked structures KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) +# Warn if there is an enum types mismatch +KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion) + # change __FILE__ to the relative path from the srctree KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) -- 2.41.0
