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| author | Tom Zanussi <tzanussi@gmail.com> | 2009-04-28 03:04:53 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-29 14:06:03 +0200 |
| commit | a118e4d1402f1349fe3d953493e4168a300a752d (patch) | |
| tree | bd4c2fccee4528bf7d1536e33218516953904740 /include/linux/ftrace_event.h | |
| parent | 30e673b230f9d556eb81ef68a7b1a08c8b3b142c (diff) | |
| download | lwn-a118e4d1402f1349fe3d953493e4168a300a752d.tar.gz lwn-a118e4d1402f1349fe3d953493e4168a300a752d.zip | |
tracing/filters: distinguish between signed and unsigned fields
The new filter comparison ops need to be able to distinguish between
signed and unsigned field types, so add an is_signed flag/param to the
event field struct/trace_define_fields(). Also define a simple macro,
is_signed_type() to determine the signedness at compile time, used in the
trace macros. If the is_signed_type() macro won't work with a specific
type, a new slightly modified version of TRACE_FIELD() called
TRACE_FIELD_SIGN(), allows the signedness to be set explicitly.
[ Impact: extend trace-filter code for new feature ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905893.6416.120.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/ftrace_event.h')
| -rw-r--r-- | include/linux/ftrace_event.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index 46a27f2695a6..e61a7403f3d0 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -122,8 +122,9 @@ extern int filter_current_check_discard(struct ftrace_event_call *call, struct ring_buffer_event *event); extern int trace_define_field(struct ftrace_event_call *call, char *type, - char *name, int offset, int size); + char *name, int offset, int size, int is_signed); +#define is_signed_type(type) (((type)(-1)) < 0) /* * The double __builtin_constant_p is because gcc will give us an error @@ -144,10 +145,10 @@ do { \ __trace_printk(ip, fmt, ##args); \ } while (0) -#define __common_field(type, item) \ +#define __common_field(type, item, is_signed) \ ret = trace_define_field(event_call, #type, "common_" #item, \ offsetof(typeof(field.ent), item), \ - sizeof(field.ent.item)); \ + sizeof(field.ent.item), is_signed); \ if (ret) \ return ret; |