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authorLi Zefan <lizf@cn.fujitsu.com>2009-06-01 15:35:46 +0800
committerSteven Rostedt <rostedt@goodmis.org>2009-06-01 23:25:15 -0400
commit7fcb7c472f455d1711eb5a7633204dba8800a6d6 (patch)
treeba64de513bdbe5550c6fc08078a356359830ec99 /kernel/trace/trace_output.c
parenta9c1c3abe1160a5632e48c929b02b740556bf423 (diff)
tracing/events: introduce __dynamic_array()
__string() is limited: - it's a char array, but we may want to define array with other types - a source string should be available, but we may just know the string size We introduce __dynamic_array() to break those limitations, and __string() becomes a wrapper of it. As a side effect, now __get_str() can be used in TP_fast_assign but not only TP_print. Take XFS for example, we have the string length in the dirent, but the string itself is not NULL-terminated, so __dynamic_array() can be used: TRACE_EVENT(xfs_dir2, TP_PROTO(struct xfs_da_args *args), TP_ARGS(args), TP_STRUCT__entry( __field(int, namelen) __dynamic_array(char, name, args->namelen + 1) ... ), TP_fast_assign( char *name = __get_str(name); if (args->namelen) memcpy(name, args->name, args->namelen); name[args->namelen] = '\0'; __entry->namelen = args->namelen; ), TP_printk("name %.*s namelen %d", __entry->namelen ? __get_str(name) : NULL __entry->namelen) ); [ Impact: allow defining dynamic size arrays ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A2384D2.3080403@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_output.c')
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