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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869/* 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);