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| author | Rikard Falkeborn <rikard.falkeborn@gmail.com> | 2019-12-04 16:50:20 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-04 19:44:12 -0800 |
| commit | 8788994376d84d627450fd0d67deb6a66ddf07d7 (patch) | |
| tree | a3ce53d232659742f52eee5cb493bd77a8c14b90 /include/linux | |
| parent | a512ae54cee18296384f45201b3118345ce0dc80 (diff) | |
| download | lwn-8788994376d84d627450fd0d67deb6a66ddf07d7.tar.gz lwn-8788994376d84d627450fd0d67deb6a66ddf07d7.zip | |
linux/build_bug.h: change type to int
Having BUILD_BUG_ON_ZERO produce a value of type size_t leads to awkward
casts in cases where the result needs to be signed, or of smaller type
than size_t. To avoid this, cast the value to int instead and rely on
implicit type conversions when a larger or unsigned type is needed.
Link: http://lkml.kernel.org/r/20190811184938.1796-3-rikard.falkeborn@gmail.com
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Joe Perches <joe@perches.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/build_bug.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h index 0fe5426f2bdc..e3a0be2c90ad 100644 --- a/include/linux/build_bug.h +++ b/include/linux/build_bug.h @@ -9,11 +9,11 @@ #else /* __CHECKER__ */ /* * Force a compilation error if condition is true, but also produce a - * result (of value 0 and type size_t), so the expression can be used + * result (of value 0 and type int), so the expression can be used * e.g. in a structure initializer (or where-ever else comma expressions * aren't permitted). */ -#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); })) +#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) #endif /* __CHECKER__ */ /* Force a compilation error if a constant expression is not a power of 2 */ |