The clang warning -Wshorten-64-to-32 can be useful to catch
inadvertent truncation. In some instances this truncation can lead to
changing the sign of a result, for example, truncation to return an
int to fit a sort routine. Silence the warning by making the implicit
truncation explicit.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/builtin-daemon.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index f0568431fbd5..640ba8191083 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -514,7 +514,8 @@ static int daemon_session__control(struct daemon_session *session,
 	struct pollfd pollfd = { .events = POLLIN, };
 	char control_path[PATH_MAX];
 	char ack_path[PATH_MAX];
-	int control, ack = -1, len;
+	int control, ack = -1;
+	size_t len;
 	char buf[20];
 	int ret = -1;
 	ssize_t err;
@@ -543,7 +544,7 @@ static int daemon_session__control(struct daemon_session *session,
 	len = strlen(msg);
 
 	err = writen(control, msg, len);
-	if (err != len) {
+	if (err != (ssize_t)len) {
 		pr_err("failed: write to control pipe: %d (%s)\n",
 		       errno, control_path);
 		goto out;
-- 
2.49.0.504.g3bcea36a83-goog