torture.c (0b962c8fe0e5c72a252b236814a6b6e9df799061) torture.c (1afb95fee0342b8d9e05b0433e8e44a6dfd7c4a3)
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Common functions for in-kernel torture tests.
4 *
5 * Copyright (C) IBM Corporation, 2014
6 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
8 * Based on kernel/rcu/torture.c.

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170static int min_offline = -1;
171static int max_offline;
172static long n_online_attempts;
173static long n_online_successes;
174static unsigned long sum_online;
175static int min_online = -1;
176static int max_online;
177
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Common functions for in-kernel torture tests.
4 *
5 * Copyright (C) IBM Corporation, 2014
6 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
8 * Based on kernel/rcu/torture.c.

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170static int min_offline = -1;
171static int max_offline;
172static long n_online_attempts;
173static long n_online_successes;
174static unsigned long sum_online;
175static int min_online = -1;
176static int max_online;
177
178static int torture_online_cpus = NR_CPUS;
179
178/*
180/*
181 * Some torture testing leverages confusion as to the number of online
182 * CPUs. This function returns the torture-testing view of this number,
183 * which allows torture tests to load-balance appropriately.
184 */
185int torture_num_online_cpus(void)
186{
187 return READ_ONCE(torture_online_cpus);
188}
189EXPORT_SYMBOL_GPL(torture_num_online_cpus);
190
191/*
179 * Attempt to take a CPU offline. Return false if the CPU is already
180 * offline or if it is not subject to CPU-hotplug operations. The
181 * caller can detect other failures by looking at the statistics.
182 */
183bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
184 unsigned long *sum_offl, int *min_offl, int *max_offl)
185{
186 unsigned long delta;

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224 if (*min_offl < 0) {
225 *min_offl = delta;
226 *max_offl = delta;
227 }
228 if (*min_offl > delta)
229 *min_offl = delta;
230 if (*max_offl < delta)
231 *max_offl = delta;
192 * Attempt to take a CPU offline. Return false if the CPU is already
193 * offline or if it is not subject to CPU-hotplug operations. The
194 * caller can detect other failures by looking at the statistics.
195 */
196bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
197 unsigned long *sum_offl, int *min_offl, int *max_offl)
198{
199 unsigned long delta;

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237 if (*min_offl < 0) {
238 *min_offl = delta;
239 *max_offl = delta;
240 }
241 if (*min_offl > delta)
242 *min_offl = delta;
243 if (*max_offl < delta)
244 *max_offl = delta;
245 WRITE_ONCE(torture_online_cpus, torture_online_cpus - 1);
246 WARN_ON_ONCE(torture_online_cpus <= 0);
232 }
233
234 return true;
235}
236EXPORT_SYMBOL_GPL(torture_offline);
237
238/*
239 * Attempt to bring a CPU online. Return false if the CPU is already

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280 if (*min_onl < 0) {
281 *min_onl = delta;
282 *max_onl = delta;
283 }
284 if (*min_onl > delta)
285 *min_onl = delta;
286 if (*max_onl < delta)
287 *max_onl = delta;
247 }
248
249 return true;
250}
251EXPORT_SYMBOL_GPL(torture_offline);
252
253/*
254 * Attempt to bring a CPU online. Return false if the CPU is already

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295 if (*min_onl < 0) {
296 *min_onl = delta;
297 *max_onl = delta;
298 }
299 if (*min_onl > delta)
300 *min_onl = delta;
301 if (*max_onl < delta)
302 *max_onl = delta;
303 WRITE_ONCE(torture_online_cpus, torture_online_cpus + 1);
288 }
289
290 return true;
291}
292EXPORT_SYMBOL_GPL(torture_online);
293
294/*
295 * Get everything online at the beginning and ends of tests.

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305
306 return true;
307}
308EXPORT_SYMBOL_GPL(torture_online);
309
310/*
311 * Get everything online at the beginning and ends of tests.

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