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tracing: Restore system filter behavior

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Though not all events have field 'prev_pid', it was allowed to do this:

  # echo 'prev_pid == 100' > events/sched/filter

but commit 75b8e98263 (tracing/filter: Swap
entire filter of events) broke it without any reason.

Link: http://lkml.kernel.org/r/4EAF46CF.8040408@cn.fujitsu.com

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan 2011-11-01 09:09:35 +08:00 committed by Steven Rostedt
parent cb59974742
commit 27b14b56af
2 changed files with 8 additions and 1 deletions
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2
include/linux/ftrace_event.h
View File

@ -172,6 +172,7 @@ enum {
TRACE_EVENT_FL_FILTERED_BIT,
TRACE_EVENT_FL_RECORDED_CMD_BIT,
TRACE_EVENT_FL_CAP_ANY_BIT,
TRACE_EVENT_FL_NO_SET_FILTER_BIT,
};
enum {
@ -179,6 +180,7 @@ enum {
TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
TRACE_EVENT_FL_RECORDED_CMD = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT),
TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
};
struct ftrace_event_call {

7
kernel/trace/trace_events_filter.c
View File

@ -1649,7 +1649,9 @@ static int replace_system_preds(struct event_subsystem *system,
*/
err = replace_preds(call, NULL, ps, filter_string, true);
if (err)
goto fail;
call->flags |= TRACE_EVENT_FL_NO_SET_FILTER;
else
call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER;
}
list_for_each_entry(call, &ftrace_events, list) {
@ -1658,6 +1660,9 @@ static int replace_system_preds(struct event_subsystem *system,
if (strcmp(call->class->system, system->name) != 0)
continue;
if (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)
continue;
filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL);
if (!filter_item)
goto fail_mem;