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| 2 | * by: john stultz ([email protected])
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| 3 | * (C) Copyright IBM 2012
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| 4 | * Licensed under the GPLv2
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| 5 | *
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| 6 | * NOTE: This is a meta-test which quickly changes the clocksource and
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| 7 | * then uses other tests to detect problems. Thus this test requires
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| 8 | * that the inconsistency-check and nanosleep tests be present in the
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| 9 | * same directory it is run from.
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| 10 | *
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| 11 | * To build:
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| 12 | * $ gcc clocksource-switch.c -o clocksource-switch -lrt
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| 13 | *
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| 14 | * This program is free software: you can redistribute it and/or modify
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| 15 | * it under the terms of the GNU General Public License as published by
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| 16 | * the Free Software Foundation, either version 2 of the License, or
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| 17 | * (at your option) any later version.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful,
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| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 22 | * GNU General Public License for more details.
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| 23 |
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| 24 |
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| 25 |
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| 26 | #include <fcntl.h>
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| 27 | #include <stdio.h>
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| 28 | #include <stdlib.h>
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| 29 | #include <string.h>
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| 30 | #include <sys/stat.h>
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| 31 | #include <sys/time.h>
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| 32 | #include <sys/timex.h>
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| 33 | #include <sys/types.h>
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| 34 | #include <sys/wait.h>
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| 35 | #include <time.h>
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| 36 | #include <unistd.h>
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| 37 | #include "kselftest.h"
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| 38 |
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| 39 |
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| 40 | int get_clocksources(char list[][30])
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| 41 | {
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| 42 | int fd, i;
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| 43 | size_t size;
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| 44 | char buf[512];
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| 45 | char *head, *tmp;
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| 46 |
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| 47 | fd = open("/sys/devices/system/clocksource/clocksource0/available_clocksource", O_RDONLY);
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| 48 |
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| 49 | size = read(fd, buf, 512);
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| 50 |
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| 51 | close(fd);
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| 52 |
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| 53 | for (i = 0; i < 10; i++)
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| 54 | list[i][0] = '\0';
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| 55 |
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| 56 | head = buf;
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| 57 | i = 0;
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| 58 | while (head - buf < size) {
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| 59 |
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| 60 | for (tmp = head; *tmp != ' '; tmp++) {
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| 61 | if (*tmp == '\n')
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| 62 | break;
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| 63 | if (*tmp == '\0')
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| 64 | break;
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| 65 | }
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| 66 | *tmp = '\0';
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| 67 | strcpy(list[i], head);
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| 68 | head = tmp + 1;
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| 69 | i++;
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| 70 | }
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| 71 |
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| 72 | return i-1;
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| 73 | }
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| 74 |
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| 75 | int get_cur_clocksource(char *buf, size_t size)
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| 76 | {
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| 77 | int fd;
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| 78 |
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| 79 | fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_RDONLY);
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| 80 |
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| 81 | size = read(fd, buf, size);
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| 82 |
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| 83 | return 0;
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| 84 | }
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| 85 |
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| 86 | int change_clocksource(char *clocksource)
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| 87 | {
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| 88 | int fd;
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| 89 | ssize_t size;
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| 90 |
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| 91 | fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_WRONLY);
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| 92 |
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| 93 | if (fd < 0)
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| 94 | return -1;
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| 95 |
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| 96 | size = write(fd, clocksource, strlen(clocksource));
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| 97 |
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| 98 | if (size < 0)
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| 99 | return -1;
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| 100 |
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| 101 | close(fd);
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| 102 | return 0;
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| 103 | }
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| 104 |
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| 105 |
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| 106 | int run_tests(int secs)
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| 107 | {
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| 108 | int ret;
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| 109 | char buf[255];
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| 110 |
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| 111 | sprintf(buf, "./inconsistency-check -t %i", secs);
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| 112 | ret = system(buf);
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| 113 | if (WIFEXITED(ret) && WEXITSTATUS(ret))
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| 114 | return WEXITSTATUS(ret);
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| 115 | ret = system("./nanosleep");
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| 116 | return WIFEXITED(ret) ? WEXITSTATUS(ret) : 0;
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| 117 | }
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| 118 |
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| 119 |
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| 120 | char clocksource_list[10][30];
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| 121 |
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| 122 | int main(int argc, char **argv)
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| 123 | {
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| 124 | char orig_clk[512];
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| 125 | int count, i, status, opt;
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| 126 | int do_sanity_check = 1;
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| 127 | int runtime = 60;
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| 128 | pid_t pid;
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| 129 |
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| 130 |
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| 131 | while ((opt = getopt(argc, argv, "st:")) != -1) {
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| 132 | switch (opt) {
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| 133 | case 's':
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| 134 | do_sanity_check = 0;
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| 135 | break;
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| 136 | case 't':
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| 137 | runtime = atoi(optarg);
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| 138 | break;
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| 139 | default:
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| 140 | printf("Usage: %s [-s] [-t <secs>]\n", argv[0]);
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| 141 | printf(" -s: skip sanity checks\n");
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| 142 | printf(" -t: Number of seconds to run\n");
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| 143 | exit(-1);
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| 144 | }
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| 145 | }
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| 146 |
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| 147 | get_cur_clocksource(orig_clk, 512);
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| 148 |
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| 149 | count = get_clocksources(clocksource_list);
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| 150 |
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| 151 | if (change_clocksource(clocksource_list[0])) {
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| 152 | printf("Error: You probably need to run this as root\n");
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| 153 | return -1;
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| 154 | }
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| 155 |
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| 156 |
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| 157 | if (do_sanity_check) {
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| 158 | for (i = 0; i < count; i++) {
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| 159 | ksft_print_msg("Validating clocksource %s\n",
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| 160 | clocksource_list[i]);
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| 161 | if (change_clocksource(clocksource_list[i])) {
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| 162 | status = -1;
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| 163 | goto out;
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| 164 | }
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| 165 | if (run_tests(5)) {
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| 166 | status = -1;
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| 167 | goto out;
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | ksft_print_msg("Running Asynchronous Switching Tests...\n");
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| 173 | pid = fork();
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| 174 | if (!pid)
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| 175 | return run_tests(runtime);
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| 176 |
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| 177 | while (pid != waitpid(pid, &status, WNOHANG))
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| 178 | for (i = 0; i < count; i++)
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| 179 | if (change_clocksource(clocksource_list[i])) {
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| 180 | status = -1;
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| 181 | goto out;
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| 182 | }
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| 183 | out:
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| 184 | change_clocksource(orig_clk);
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| 185 |
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| 186 |
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| 187 | ksft_print_header();
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| 188 | ksft_set_plan(1);
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| 189 | ksft_test_result(!status, "clocksource-switch\n");
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| 190 | ksft_exit(!status);
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| 191 | }
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