libperf: Merge libperf_set_print() into libperf_init()

The libperf_set_print() function needs to be called in any case so let's
merge it with libperf_init(), so we have just one init function.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-34-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/core.c

@@ -17,11 +17,6 @@ static int __base_pr(enum libperf_print_level level, const char *format,
 
 static libperf_print_fn_t __libperf_pr = __base_pr;
 
-void libperf_set_print(libperf_print_fn_t fn)
-{
-	__libperf_pr = fn;
-}
-
 __printf(2, 3)
 void libperf_print(enum libperf_print_level level, const char *format, ...)
 {
@@ -35,7 +30,8 @@ void libperf_print(enum libperf_print_level level, const char *format, ...)
 	va_end(args);
 }
 
-void libperf_init(void)
+void libperf_init(libperf_print_fn_t fn)
 {
 	page_size = sysconf(_SC_PAGE_SIZE);
+	__libperf_pr = fn;
 }

tools/perf/lib/include/perf/core.h

@@ -17,7 +17,6 @@ enum libperf_print_level {
 typedef int (*libperf_print_fn_t)(enum libperf_print_level level,
 				  const char *, va_list ap);
 
-LIBPERF_API void libperf_set_print(libperf_print_fn_t fn);
-LIBPERF_API void libperf_init(void);
+LIBPERF_API void libperf_init(libperf_print_fn_t fn);
 
 #endif /* __LIBPERF_CORE_H */

tools/perf/lib/libperf.map

 LIBPERF_0.0.1 {
 	global:
 		libperf_init;
-		libperf_set_print;
 		perf_cpu_map__dummy_new;
 		perf_cpu_map__get;
 		perf_cpu_map__put;

tools/perf/perf.c

@@ -430,6 +430,12 @@ void pthread__unblock_sigwinch(void)
 	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 }
 
+static int libperf_print(enum libperf_print_level level,
+			 const char *fmt, va_list ap)
+{
+	return eprintf(level, verbose, fmt, ap);
+}
+
 int main(int argc, const char **argv)
 {
 	int err;
@@ -440,7 +446,7 @@ int main(int argc, const char **argv)
 	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
 	pager_init(PERF_PAGER_ENVIRONMENT);
 
-	libperf_init();
+	libperf_init(libperf_print);
 
 	cmd = extract_argv0_path(argv[0]);
 	if (!cmd)