/* SPDX-License-Identifier: GPL-2.0 */#include <signal.h>#include <stdlib.h>#include <linux/compiler.h>#include <unistd.h>#include "../tests.h" /* We want to check these symbols in perf script */noinline void leaf(void);noinline void parent(void); static volatile sig_atomic_t done asm("leafloop_done"); static void sighandler(int sig __maybe_unused){	done = 1;} #if defined(__aarch64__)/* * Write leaf() in assembly so it stays as a minimal leaf function with no * stack frame and won't get silently broken in the future by any Perf wide * compilation options like -fstack-protector-all. */asm(	".pushsection .text,\"ax\",%progbits\n"	".global leaf\n"	".type leaf, %function\n"	"leaf:\n"	"	adrp	x1, leafloop_done\n"	"	ldr	w2, [x1, #:lo12:leafloop_done]\n"	"	cbz	w2, leaf\n"	"	ret\n"	".size leaf, .-leaf\n"	".popsection\n"); #else noinline void leaf(void){	while (!done)		;} #endif noinline void parent(void){	leaf();} static int leafloop(int argc, const char **argv){	int sec = 1; 	if (argc > 0)		sec = atoi(argv[0]); 	signal(SIGINT, sighandler);	signal(SIGALRM, sighandler);	alarm(sec); 	parent();	return 0;} DEFINE_WORKLOAD(leafloop);