perf mmap: Simplify perf_mmap__read_event()

It isn't necessary to pass the 'overwrite', 'start' and 'end' argument
to perf_mmap__read_event().  Discard them.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1520350567-80082-7-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/backward-ring-buffer.c

@@ -36,7 +36,7 @@ static int count_samples(struct perf_evlist *evlist, int *sample_count,
 		u64 start, end;
 
 		perf_mmap__read_init(map, true, &start, &end);
-		while ((event = perf_mmap__read_event(map, true, &start, end)) != NULL) {
+		while ((event = perf_mmap__read_event(map)) != NULL) {
 			const u32 type = event->header.type;
 
 			switch (type) {

tools/perf/tests/bpf.c

@@ -183,7 +183,7 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
 		if (perf_mmap__read_init(md, false, &start, &end) < 0)
 			continue;
 
-		while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+		while ((event = perf_mmap__read_event(md)) != NULL) {
 			const u32 type = event->header.type;
 
 			if (type == PERF_RECORD_SAMPLE)

tools/perf/tests/code-reading.c

@@ -418,7 +418,7 @@ static int process_events(struct machine *machine, struct perf_evlist *evlist,
 		if (perf_mmap__read_init(md, false, &start, &end) < 0)
 			continue;
 
-		while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+		while ((event = perf_mmap__read_event(md)) != NULL) {
 			ret = process_event(machine, evlist, event, state);
 			perf_mmap__consume(md);
 			if (ret < 0)

tools/perf/tests/keep-tracking.c

@@ -36,7 +36,7 @@ static int find_comm(struct perf_evlist *evlist, const char *comm)
 		md = &evlist->mmap[i];
 		if (perf_mmap__read_init(md, false, &start, &end) < 0)
 			continue;
-		while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+		while ((event = perf_mmap__read_event(md)) != NULL) {
 			if (event->header.type == PERF_RECORD_COMM &&
 			    (pid_t)event->comm.pid == getpid() &&
 			    (pid_t)event->comm.tid == getpid() &&

tools/perf/tests/mmap-basic.c

@@ -112,7 +112,7 @@ int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unuse
 	if (perf_mmap__read_init(md, false, &start, &end) < 0)
 		goto out_init;
 
-	while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+	while ((event = perf_mmap__read_event(md)) != NULL) {
 		struct perf_sample sample;
 
 		if (event->header.type != PERF_RECORD_SAMPLE) {

tools/perf/tests/openat-syscall-tp-fields.c

@@ -93,7 +93,7 @@ int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest
 			if (perf_mmap__read_init(md, false, &start, &end) < 0)
 				continue;
 
-			while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+			while ((event = perf_mmap__read_event(md)) != NULL) {
 				const u32 type = event->header.type;
 				int tp_flags;
 				struct perf_sample sample;

tools/perf/tests/perf-record.c

@@ -171,7 +171,7 @@ int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unus
 			if (perf_mmap__read_init(md, false, &start, &end) < 0)
 				continue;
 
-			while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+			while ((event = perf_mmap__read_event(md)) != NULL) {
 				const u32 type = event->header.type;
 				const char *name = perf_event__name(type);
 

tools/perf/tests/sw-clock.c

@@ -99,7 +99,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
 	if (perf_mmap__read_init(md, false, &start, &end) < 0)
 		goto out_init;
 
-	while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+	while ((event = perf_mmap__read_event(md)) != NULL) {
 		struct perf_sample sample;
 
 		if (event->header.type != PERF_RECORD_SAMPLE)

tools/perf/tests/switch-tracking.c

@@ -267,7 +267,7 @@ static int process_events(struct perf_evlist *evlist,
 		if (perf_mmap__read_init(md, false, &start, &end) < 0)
 			continue;
 
-		while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+		while ((event = perf_mmap__read_event(md)) != NULL) {
 			cnt += 1;
 			ret = add_event(evlist, &events, event);
 			 perf_mmap__consume(md);

tools/perf/tests/task-exit.c

@@ -116,7 +116,7 @@ retry:
 	if (perf_mmap__read_init(md, false, &start, &end) < 0)
 		goto out_init;
 
-	while ((event = perf_mmap__read_event(md, false, &start, end)) != NULL) {
+	while ((event = perf_mmap__read_event(md)) != NULL) {
 		if (event->header.type == PERF_RECORD_EXIT)
 			nr_exit++;