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| author | KP Singh <kpsingh@kernel.org> | 2024-08-16 17:43:06 +0200 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2024-08-22 12:23:47 -0400 |
| commit | d51e783c17bab0c139bf78d6bd9d1f66673f7903 (patch) | |
| tree | 63a687b2677e5079ac9d3c5970d57df0a8eb87d9 /include/linux/args.h | |
| parent | 7cff549daa67c7549c5a8688674cea2df8c2ec80 (diff) | |
| download | linux-d51e783c17bab0c139bf78d6bd9d1f66673f7903.tar.gz linux-d51e783c17bab0c139bf78d6bd9d1f66673f7903.tar.bz2 linux-d51e783c17bab0c139bf78d6bd9d1f66673f7903.zip | |
lsm: count the LSMs enabled at compile time
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.
Tested-by: Guenter Roeck <linux@roeck-us.net>
Suggested-by: Kui-Feng Lee <sinquersw@gmail.com>
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Nacked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: KP Singh <kpsingh@kernel.org>
[PM: added IPE to the count during merge]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'include/linux/args.h')
| -rw-r--r-- | include/linux/args.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/args.h b/include/linux/args.h index 8ff60a54eb7d..2e8e65d975c7 100644 --- a/include/linux/args.h +++ b/include/linux/args.h @@ -17,9 +17,9 @@ * that as _n. */ -/* 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) /* Concatenate two parameters, but allow them to be expanded beforehand. */ #define __CONCAT(a, b) a ## b |