Re: [PATCH v3 2/5] security: Count the LSMs enabled at compile time

[Kees Cook <keescook@xxxxxxxxxxxx>]

On 9/18/2023 2:24 PM, KP Singh wrote:
> [...]
> +#define __COUNT_COMMAS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
> +#define COUNT_COMMAS(a, X...) __COUNT_COMMAS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
> +#define ___COUNT_COMMAS(args...) COUNT_COMMAS(args)

Oh! Oops, I missed that this _DOES_ already exist in Linux:

cf14f27f82af ("macro: introduce COUNT_ARGS() macro")

now in include/linux/args.h as COUNT_ARGS():

#define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
#define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)

I think this can be refactored to use that?

-Kees

-- 
Kees Cook