[PATCH v15 3/4] lsm: count the LSMs enabled at compile time

[Paul Moore]

On November 26, 2025 12:14:21 PM Andy Shevchenko 
<andriy.shevchenko at intel.com> wrote:
> On Fri, Aug 16, 2024 at 05:43:06PM +0200, KP Singh wrote:
>> These macros are a clever trick to determine a count of the number of
>> LSMs that are enabled in the config to ascertain the maximum number of
>> static calls that need to be configured per LSM hook.
>>
>> Without this one would need to generate static calls for the total
>> number of LSMs in the kernel (even if they are not compiled) times the
>> number of LSM hooks which ends up being quite wasteful.
>
> ...
>
>> -/* This counts to 12. Any more, it will return 13th argument. */
>> -#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)
>> +/* This counts to 15. Any more, it will return 16th argument. */
>> +#define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, 
>> _12, _13, _14, _15, _n, X...) _n
>> +#define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 15, 14, 13, 12, 11, 10, 9, 8, 
>> 7, 6, 5, 4, 3, 2, 1, 0)
>
> You forgot to update _12 in the upper comment.

Do you plan to send a patch to fix this?

--
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