From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755987AbZFWScK (ORCPT ); Tue, 23 Jun 2009 14:32:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755676AbZFWSbh (ORCPT ); Tue, 23 Jun 2009 14:31:37 -0400 Received: from mx2.redhat.com ([66.187.237.31]:39326 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755645AbZFWSbg (ORCPT ); Tue, 23 Jun 2009 14:31:36 -0400 Date: Tue, 23 Jun 2009 14:29:04 -0400 From: Jason Baron To: linux-kernel@vger.kernel.org Cc: fweisbec@gmail.com, mingo@elte.hu, laijs@cn.fujitsu.com, rostedt@goodmis.org, peterz@infradead.org, mathieu.desnoyers@polymtl.ca, jiayingz@google.com, mbligh@google.com, roland@redhat.com, fche@redhat.com, lizf@cn.fujitsu.com Message-Id: In-Reply-To: References: Subject: [PATCH 3/7] V2 add syscall tracepoints Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a new 'DECLARE_TRACE_WITH_CALLBACK()' macro, so that tracepoints can associate an external register/unregister function. Signed-off-by: Jason Baron Acked-by: Frederic Weisbecker --- include/linux/tracepoint.h | 29 +++++++++++++++++++++++++---- 1 files changed, 25 insertions(+), 4 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index b9dc4ca..778e018 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -60,8 +60,10 @@ struct tracepoint { * Make sure the alignment of the structure in the __tracepoints section will * not add unwanted padding between the beginning of the section and the * structure. Force alignment to the same alignment as the section start. + * An optional set of (un)registration functions can be passed to perform any + * additional (un)registration work. */ -#define DECLARE_TRACE(name, proto, args) \ +#define DECLARE_TRACE_WITH_CALLBACK(name, proto, args, reg, unreg) \ extern struct tracepoint __tracepoint_##name; \ static inline void trace_##name(proto) \ { \ @@ -71,13 +73,29 @@ struct tracepoint { } \ static inline int register_trace_##name(void (*probe)(proto)) \ { \ - return tracepoint_probe_register(#name, (void *)probe); \ + int ret; \ + void (*func)(void) = (void (*)(void))reg; \ + \ + ret = tracepoint_probe_register(#name, (void *)probe); \ + if (func && !ret) \ + func(); \ + return ret; \ } \ static inline int unregister_trace_##name(void (*probe)(proto)) \ { \ - return tracepoint_probe_unregister(#name, (void *)probe);\ + int ret; \ + void (*func)(void) = (void (*)(void))unreg; \ + \ + ret = tracepoint_probe_unregister(#name, (void *)probe);\ + if (func && !ret) \ + func(); \ + return ret; \ } + +#define DECLARE_TRACE(name, proto, args) \ + DECLARE_TRACE_WITH_CALLBACK(name, TP_PROTO(proto), TP_ARGS(args), 0, 0); + #define DEFINE_TRACE(name) \ static const char __tpstrtab_##name[] \ __attribute__((section("__tracepoints_strings"))) = #name; \ @@ -94,7 +112,7 @@ extern void tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end); #else /* !CONFIG_TRACEPOINTS */ -#define DECLARE_TRACE(name, proto, args) \ +#define DECLARE_TRACE_WITH_CALLBACK(name, proto, args, reg, unreg) \ static inline void _do_trace_##name(struct tracepoint *tp, proto) \ { } \ static inline void trace_##name(proto) \ @@ -108,6 +126,9 @@ extern void tracepoint_update_probe_range(struct tracepoint *begin, return -ENOSYS; \ } +#define DECLARE_TRACE(name, proto, args) \ + DECLARE_TRACE_WITH_CALLBACK(name, TP_PROTO(proto), TP_ARGS(args), 0, 0); + #define DEFINE_TRACE(name) #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) #define EXPORT_TRACEPOINT_SYMBOL(name) -- 1.6.0.6