perf probe: Fix --del to update current event list

Fix --del option to update current existing event list
after perf probe deleted an event.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091215153149.17436.61265.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/probe-event.c

@@ -540,10 +540,12 @@ static void del_trace_kprobe_event(int fd, const char *group,
 				   const char *event, struct strlist *namelist)
 {
 	char buf[128];
+	struct str_node *ent;
 
 	if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
 		die("Failed to copy event.");
-	if (!strlist__has_entry(namelist, buf)) {
+	ent = strlist__find(namelist, buf);
+	if (!ent) {
 		pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
 		return;
 	}
@@ -553,6 +555,7 @@ static void del_trace_kprobe_event(int fd, const char *group,
 
 	write_trace_kprobe_event(fd, buf);
 	printf("Remove event: %s:%s\n", group, event);
+	strlist__remove(namelist, ent);
 }
 
 void del_trace_kprobe_events(struct strlist *dellist)

tools/perf/util/strlist.c

@@ -102,7 +102,7 @@ void strlist__remove(struct strlist *self, struct str_node *sn)
 	str_node__delete(sn, self->dupstr);
 }
 
-bool strlist__has_entry(struct strlist *self, const char *entry)
+struct str_node *strlist__find(struct strlist *self, const char *entry)
 {
 	struct rb_node **p = &self->entries.rb_node;
 	struct rb_node *parent = NULL;
@@ -120,10 +120,10 @@ bool strlist__has_entry(struct strlist *self, const char *entry)
 		else if (rc < 0)
 			p = &(*p)->rb_right;
 		else
-			return true;
+			return sn;
 	}
 
-	return false;
+	return NULL;
 }
 
 static int strlist__parse_list_entry(struct strlist *self, const char *s)

tools/perf/util/strlist.h

@@ -23,7 +23,12 @@ int strlist__load(struct strlist *self, const char *filename);
 int strlist__add(struct strlist *self, const char *str);
 
 struct str_node *strlist__entry(const struct strlist *self, unsigned int idx);
-bool strlist__has_entry(struct strlist *self, const char *entry);
+struct str_node *strlist__find(struct strlist *self, const char *entry);
+
+static inline bool strlist__has_entry(struct strlist *self, const char *entry)
+{
+	return strlist__find(self, entry) != NULL;
+}
 
 static inline bool strlist__empty(const struct strlist *self)
 {