On 07. 03. 25, 10:19, Kuan-Wei Chiu wrote:

I used to believe that casting a boolean variable to int would always
result in 0 or 1 until a few months ago when Waiman Long explicitly
pointed out during a review that C does not guarantee this.

So I revisited the C11 standard, which states that casting to _Bool
always results in 0 or 1 [1]. Another section specifies that bool,
true, and false are macros defined in <stdbool.h>, with true expanding
to 1 and false to 0. However, these macros can be #undef and redefined
to other values [2].

Note that we do not have/use user's stdbool.h in kernel at all. Instead, 
in linux/stddef.h, we define:
enum {
         false   = 0,
         true    = 1
};

So all is blue.

thanks,
-- 
js
suse labs