// SPDX-License-Identifier: GPL-2.0-only #define __printf(a, b)  __attribute__((format(printf, a, b))) #include <stdio.h>#include <stdarg.h>#include <unistd.h>#include <linux/compiler.h>#include <perf/core.h>#include <internal/lib.h>#include "internal.h" static int __base_pr(enum libperf_print_level level __maybe_unused, const char *format,		     va_list args){	return vfprintf(stderr, format, args);} static libperf_print_fn_t __libperf_pr = __base_pr; __printf(2, 3)void libperf_print(enum libperf_print_level level, const char *format, ...){	va_list args; 	if (!__libperf_pr)		return; 	va_start(args, format);	__libperf_pr(level, format, args);	va_end(args);} void libperf_init(libperf_print_fn_t fn){	page_size = sysconf(_SC_PAGE_SIZE);	__libperf_pr = fn;}