From: Alexei Starovoitov <ast@fb•com>
To: <davem@davemloft•net>
Cc: <daniel@iogearbox•net>, <torvalds@linux-foundation•org>,
<peterz@infradead•org>, <rostedt@goodmis•org>,
<netdev@vger•kernel.org>, <kernel-team@fb•com>,
<linux-api@vger•kernel.org>
Subject: [PATCH v6 bpf-next 05/11] macro: introduce COUNT_ARGS() macro
Date: Mon, 26 Mar 2018 19:47:00 -0700 [thread overview]
Message-ID: <20180327024706.2064725-6-ast@fb.com> (raw)
In-Reply-To: <20180327024706.2064725-1-ast@fb.com>
From: Alexei Starovoitov <ast@kernel•org>
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>
---
include/linux/kernel.h | 7 +++++++
security/apparmor/include/path.h | 7 +------
2 files changed, 8 insertions(+), 6 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.
diff --git a/security/apparmor/include/path.h b/security/apparmor/include/path.h
index 05fb3305671e..e042b994f2b8 100644
--- a/security/apparmor/include/path.h
+++ b/security/apparmor/include/path.h
@@ -43,15 +43,10 @@ struct aa_buffers {
DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
-#define COUNT_ARGS(X...) COUNT_ARGS_HELPER(, ##X, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
-#define COUNT_ARGS_HELPER(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, n, X...) n
-#define CONCAT(X, Y) X ## Y
-#define CONCAT_AFTER(X, Y) CONCAT(X, Y)
-
#define ASSIGN(FN, X, N) ((X) = FN(N))
#define EVAL1(FN, X) ASSIGN(FN, X, 0) /*X = FN(0)*/
#define EVAL2(FN, X, Y...) do { ASSIGN(FN, X, 1); EVAL1(FN, Y); } while (0)
-#define EVAL(FN, X...) CONCAT_AFTER(EVAL, COUNT_ARGS(X))(FN, X)
+#define EVAL(FN, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, X)
#define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
--
2.9.5
next prev parent reply other threads:[~2018-03-27 2:47 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 2:46 [PATCH v6 bpf-next 00/11] bpf, tracing: introduce bpf raw tracepoints Alexei Starovoitov
2018-03-27 2:46 ` [PATCH v6 bpf-next 01/11] treewide: remove large struct-pass-by-value from tracepoint arguments Alexei Starovoitov
2018-03-27 2:46 ` [PATCH v6 bpf-next 02/11] net/mediatek: disambiguate mt76 vs mt7601u trace events Alexei Starovoitov
2018-03-27 2:46 ` [PATCH v6 bpf-next 03/11] net/mac802154: disambiguate mac80215 vs mac802154 " Alexei Starovoitov
2018-03-27 2:46 ` [PATCH v6 bpf-next 04/11] net/wireless/iwlwifi: fix iwlwifi_dev_ucode_error tracepoint Alexei Starovoitov
2018-03-27 2:47 ` Alexei Starovoitov [this message]
2018-03-27 2:47 ` [PATCH v6 bpf-next 06/11] tracepoint: compute num_args at build time Alexei Starovoitov
2018-03-27 15:15 ` Steven Rostedt
2018-03-27 2:47 ` [PATCH v6 bpf-next 07/11] tracepoint: introduce kernel_tracepoint_find_by_name Alexei Starovoitov
2018-03-27 14:07 ` Steven Rostedt
2018-03-27 14:18 ` Mathieu Desnoyers
2018-03-27 14:42 ` Steven Rostedt
2018-03-27 15:53 ` Alexei Starovoitov
2018-03-27 16:09 ` Mathieu Desnoyers
2018-03-27 16:36 ` Daniel Borkmann
2018-03-27 2:47 ` [PATCH v6 bpf-next 08/11] bpf: introduce BPF_RAW_TRACEPOINT Alexei Starovoitov
2018-03-27 17:02 ` Steven Rostedt
2018-03-27 17:11 ` Steven Rostedt
2018-03-27 18:58 ` Steven Rostedt
2018-03-27 21:04 ` Steven Rostedt
2018-03-27 22:48 ` Alexei Starovoitov
2018-03-27 23:13 ` Mathieu Desnoyers
2018-03-28 0:00 ` Alexei Starovoitov
2018-03-28 0:44 ` Mathieu Desnoyers
2018-03-28 0:51 ` Alexei Starovoitov
2018-03-28 14:06 ` Steven Rostedt
2018-03-27 18:45 ` Alexei Starovoitov
2018-03-27 19:00 ` Steven Rostedt
2018-03-27 19:07 ` Steven Rostedt
2018-03-27 19:10 ` Steven Rostedt
2018-03-27 19:10 ` Mathieu Desnoyers
2018-03-27 2:47 ` [PATCH v6 bpf-next 09/11] libbpf: add bpf_raw_tracepoint_open helper Alexei Starovoitov
2018-03-27 2:47 ` [PATCH v6 bpf-next 10/11] samples/bpf: raw tracepoint test Alexei Starovoitov
2018-03-27 2:47 ` [PATCH v6 bpf-next 11/11] selftests/bpf: test for bpf_get_stackid() from raw tracepoints Alexei Starovoitov
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