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-rw-r--r--tools/perf/util/util.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index c8f362daba87..9f6b928f6b2b 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -253,7 +253,7 @@ bool strlazymatch(const char *str, const char *pat);
int strtailcmp(const char *s1, const char *s2);
char *strxfrchar(char *s, char from, char to);
unsigned long convert_unit(unsigned long value, char *unit);
-int readn(int fd, void *buf, size_t size);
+ssize_t readn(int fd, void *buf, size_t n);
struct perf_event_attr;