kbuild: turn on -Wextra by default

Patch series "kbuild: enable more warnings by default", v3.

All the warning fixes I sent for these warnings have been merged into
mainline or linux-next, so let's turn them on by default.


This patch (of 6):

The -Wextra option controls a number of different warnings that differ
slightly by compiler version.  Some are useful in general, others are
better left at W=1 or higher.  Based on earlier work, the ones that should
be disabled by default are left for the higher warning levels already, and
a lot of the useful ones have no remaining output when enabled.

Move the -Wextra option up into the set of default-enabled warnings and
just rely on the individual ones getting disabled as needed.

The -Wunused warning was always grouped with this, so turn it on by
default as well, except for the -Wunused-parameter warning that really has
no value at all for the kernel since many interfaces have intentionally
unused arguments.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Nathan Chancellor <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Nicolas Schier <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions