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| author | Steven Rostedt <srostedt@redhat.com> | 2009-08-26 00:32:37 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-08-26 00:32:37 -0400 |
| commit | 7cb2e3ee2aeec5b83ecadba929a2dc575dd4008f (patch) | |
| tree | 8918c12cac3cd816bf3dfaafc3fac46e36f4a73d /include | |
| parent | 5ac35daa9343936038a3c9c4f4d6d3fe6a2a7bd8 (diff) | |
| download | linux-stable-7cb2e3ee2aeec5b83ecadba929a2dc575dd4008f.tar.gz linux-stable-7cb2e3ee2aeec5b83ecadba929a2dc575dd4008f.tar.bz2 linux-stable-7cb2e3ee2aeec5b83ecadba929a2dc575dd4008f.zip | |
tracing: add comments to explain TRACE_EVENT out of protection
The commit:
commit 5ac35daa9343936038a3c9c4f4d6d3fe6a2a7bd8
Author: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
tracing/events: fix the include file dependencies
Moved the TRACE_EVENT out of the ifdef protection of tracepoints.h
but uses the define of TRACE_EVENT itself as protection. This patch
adds comments to explain why.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tracepoint.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 81709854f7ab..0341f2e2698a 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -180,7 +180,15 @@ static inline void tracepoint_synchronize_unregister(void) } #define PARAMS(args...) args -#endif + +#endif /* _LINUX_TRACEPOINT_H */ + +/* + * Note: we keep the TRACE_EVENT outside the include file ifdef protection. + * This is due to the way trace events work. If a file includes two + * trace event headers under one "CREATE_TRACE_POINTS" the first include + * will override the TRACE_EVENT and break the second include. + */ #ifndef TRACE_EVENT /* @@ -287,4 +295,5 @@ static inline void tracepoint_synchronize_unregister(void) #define TRACE_EVENT(name, proto, args, struct, assign, print) \ DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) -#endif + +#endif /* ifdef TRACE_EVENT (see note above) */ |