[tip:perf/core] perf evsel: Introduce set_filter method

[tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com>]

Commit-ID:  12467ae4e37aab5e263cc9ab6b6909ae0588844c
Gitweb:     http://git.kernel.org/tip/12467ae4e37aab5e263cc9ab6b6909ae0588844c
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Fri, 3 Jul 2015 17:05:50 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 6 Jul 2015 10:46:36 -0300

perf evsel: Introduce set_filter method

Replaces existing filter string with the one provided.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-jst49z83li0yx3g18o54u51a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/evsel.c        | 13 +++++++++++++
 tools/perf/util/evsel.h        |  1 +
 tools/perf/util/parse-events.c |  3 +--
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6676774..ae925b9 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -823,6 +823,19 @@ int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
 				     (void *)filter);
 }
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
+{
+	char *new_filter = strdup(filter);
+
+	if (new_filter != NULL) {
+		free(evsel->filter);
+		evsel->filter = new_filter;
+		return 0;
+	}
+
+	return -1;
+}
+
 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
 {
 	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index a3ebb83..8aea4ba 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -182,6 +182,7 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
 			       bool use_sample_identifier);
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter);
 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
 			     const char *filter);
 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 09f8d23..a71eeb2 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1177,8 +1177,7 @@ int parse_filter(const struct option *opt, const char *str,
 		return -1;
 	}
 
-	last->filter = strdup(str);
-	if (last->filter == NULL) {
+	if (perf_evsel__set_filter(last, str) < 0) {
 		fprintf(stderr, "not enough memory to hold filter string\n");
 		return -1;
 	}