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| author |   Alexei Starovoitov <ast@kernel.org> | 2018-03-28 12:05:36 -0700 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-03-28 22:55:19 +0200 |
| commit | cf14f27f82af78e713f8a57c477cf9233faf8b30 (patch) | |
| tree | 35b9919d56890c7c3d04ec24e8c1c427b71786e2 /include/linux/kernel.h | |
| parent | net/wireless/iwlwifi: fix iwlwifi_dev_ucode_error tracepoint (diff) | |
| download | wireguard-linux-cf14f27f82af78e713f8a57c477cf9233faf8b30.tar.xz wireguard-linux-cf14f27f82af78e713f8a57c477cf9233faf8b30.zip | |
macro: introduce COUNT_ARGS() macro
move COUNT_ARGS() macro from apparmor to generic header and extend it
to count till twelve.
COUNT() was an alternative name for this logic, but it's used for
different purpose in many other places.
Similarly for CONCATENATE() macro.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 3fd291503576..293fa0677fba 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -919,6 +919,13 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } #define swap(a, b) \ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) +/* 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) + +#define __CONCAT(a, b) a ## b +#define CONCATENATE(a, b) __CONCAT(a, b) + /** * container_of - cast a member of a structure out to the containing structure * @ptr: the pointer to the member. |