From: Vincent Mailhol <mailhol.vincent@xxxxxxxxxx> For completion, add statically_false() which is the equivalent of statically_true() except that it will return true only if the input is known to be false at compile time. The == operator is used instead of the ! negation to prevent a -Wint-in-bool-context compiler warning when the argument is not a boolean. For example: statically_false(var * 0) Signed-off-by: Vincent Mailhol <mailhol.vincent@xxxxxxxxxx> --- include/linux/compiler.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 469a64dd6495fefab2c85ffc279568a657b72660..a2a56a50dd85227a4fdc62236a2710ca37c5ba52 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -314,6 +314,7 @@ static inline void *offset_to_ptr(const int *off) * values to determine that the condition is statically true. */ #define statically_true(x) (__builtin_constant_p(x) && (x)) +#define statically_false(x) (__builtin_constant_p(x) && (x) == 0) /* * This is needed in functions which generate the stack canary, see -- 2.45.2
