Kbuild: add -Wno-shift-negative-value where -Wextra is used

As a preparation for moving to -std=gnu11, turn off the
-Wshift-negative-value option. This warning is enabled by gcc when
building with -Wextra for c99 or higher, but not for c89. Since
the kernel already relies on well-defined overflow behavior,
the warning is not helpful and can simply be disabled in
all locations that use -Wextra.

Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Tested-by: Sedat Dilek <[email protected]> # LLVM/Clang v13.0.0 (x86-64)
Signed-off-by: Masahiro Yamada <[email protected]>

0 files changed, 0 insertions, 0 deletions