f67a33561e
Because handling races between rmmod and normal shutdown is not specific to rcutorture, this commit renames rcutorture_shutdown_absorb() to torture_shutdown_absorb() and pulls it out into then kernel/torture.c module. This implies pulling the fullstop mechanism into kernel/torture.c as well. The exporting of fullstop and fullstop_mutex is ugly and must die. And it does in fact die in later commits that introduce higher-level APIs that encapsulate both of these variables. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>`
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* Common functions for in-kernel torture tests.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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* Copyright (C) IBM Corporation, 2014
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*
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* Author: Paul E. McKenney <paulmck@us.ibm.com>
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* Based on kernel/rcu/torture.c.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/completion.h>
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#include <linux/moduleparam.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/freezer.h>
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/trace_clock.h>
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#include <asm/byteorder.h>
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#include <linux/torture.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
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int fullstop = FULLSTOP_RMMOD;
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EXPORT_SYMBOL_GPL(fullstop);
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DEFINE_MUTEX(fullstop_mutex);
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EXPORT_SYMBOL_GPL(fullstop_mutex);
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#define TORTURE_RANDOM_MULT 39916801 /* prime */
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#define TORTURE_RANDOM_ADD 479001701 /* prime */
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#define TORTURE_RANDOM_REFRESH 10000
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/*
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* Crude but fast random-number generator. Uses a linear congruential
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* generator, with occasional help from cpu_clock().
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*/
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unsigned long
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torture_random(struct torture_random_state *trsp)
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{
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if (--trsp->trs_count < 0) {
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trsp->trs_state += (unsigned long)local_clock();
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trsp->trs_count = TORTURE_RANDOM_REFRESH;
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}
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trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
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TORTURE_RANDOM_ADD;
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return swahw32(trsp->trs_state);
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}
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EXPORT_SYMBOL_GPL(torture_random);
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/*
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* Absorb kthreads into a kernel function that won't return, so that
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* they won't ever access module text or data again.
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*/
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void torture_shutdown_absorb(const char *title)
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{
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while (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
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pr_notice(
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"torture thread %s parking due to system shutdown\n",
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title);
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schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
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}
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}
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EXPORT_SYMBOL_GPL(torture_shutdown_absorb);
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