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kbuild: Enable -Wuninitialized 

This helps fine very dodgy behavior through both -Wuninitialized
(warning that a variable is always uninitialized) and
-Wsometimes-uninitialized (warning that a variable is sometimes
uninitialized, like GCC's -Wmaybe-uninitialized). These warnings
catch things that GCC doesn't such as:

https://lore.kernel.org/lkml/86649ee4-9794-77a3-502c-f4cd10019c36@lca.pw/

We very much want to catch these so turn this warning on so that CI is
aware of it.

Link: https://github.com/ClangBuiltLinux/linux/issues/381
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Nathan Chancellor 2019-06-14 09:52:42 -07:00 committed by Masahiro Yamada
parent 589834b3a0
commit 3a61925e91
1 changed files with 0 additions and 1 deletions
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scripts/Makefile.extrawarn
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@ -71,6 +71,5 @@ KBUILD_CFLAGS += -Wno-unused-value
KBUILD_CFLAGS += -Wno-format
KBUILD_CFLAGS += -Wno-sign-compare
KBUILD_CFLAGS += -Wno-format-zero-length
KBUILD_CFLAGS += -Wno-uninitialized
endif
endif