session_done is written to inside the signal handler of perf report
and script. Switch its type to avoid undefined behavior.

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

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 1a4f10de29ff..ba52cc4092dc 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <errno.h>
+#include <stdatomic.h>
 #include <inttypes.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -2022,7 +2023,7 @@ static int perf_session__flush_thread_stacks(struct perf_session *session)
 					 NULL);
 }
 
-volatile int session_done;
+volatile sig_atomic_t session_done;
 
 static int __perf_session__process_decomp_events(struct perf_session *session);
 
-- 
2.38.0.135.g90850a2211-goog