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-diff.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index ae490d58af92..9c21ea8f242a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -243,7 +243,7 @@ static int setup_compute(const struct option *opt, const char *str,
 
 	option = strchr(str, ':');
 	if (option) {
-		unsigned len = option++ - str;
+		size_t len = option++ - str;
 
 		/*
 		 * The str data are not writeable, so we need
@@ -1148,7 +1148,7 @@ static int check_file_brstack(void)
 		d->session = perf_session__new(&d->data, &pdiff.tool);
 		if (IS_ERR(d->session)) {
 			pr_err("Failed to open %s\n", d->data.path);
-			return PTR_ERR(d->session);
+			return (int)PTR_ERR(d->session);
 		}
 
 		has_br_stack = perf_header__has_feat(&d->session->header,
@@ -1179,7 +1179,7 @@ static int __cmd_diff(void)
 	data__for_each_file(i, d) {
 		d->session = perf_session__new(&d->data, &pdiff.tool);
 		if (IS_ERR(d->session)) {
-			ret = PTR_ERR(d->session);
+			ret = (int)PTR_ERR(d->session);
 			pr_err("Failed to open %s\n", d->data.path);
 			goto out_delete;
 		}
@@ -1492,10 +1492,10 @@ static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
 
 	if (n > NUM_SPARKS)
 		n = NUM_SPARKS;
-	if (all_zero(svals, n))
+	if (all_zero(svals, (int)n))
 		return 0;
 
-	printed = print_spark(bf, size, svals, n);
+	printed = print_spark(bf, size, svals, (int)n);
 	printed += scnprintf(bf + printed, size - printed, " ");
 	return printed;
 }
-- 
2.49.0.504.g3bcea36a83-goog