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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* iteration_check_2.c: Check that deleting a tagged entry doesn't cause
* an RCU walker to finish early.
* Copyright (c) 2020 Oracle
* Author: Matthew Wilcox <willy@infradead.org>
*/
#include <pthread.h>
#include "test.h"
static volatile bool test_complete;
static void *iterator(void *arg)
{
XA_STATE(xas, arg, 0);
void *entry;
rcu_register_thread();
while (!test_complete) {
xas_set(&xas, 0);
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
;
rcu_read_unlock();
assert(xas.xa_index >= 100);
}
rcu_unregister_thread();
return NULL;
}
static void *throbber(void *arg)
{
struct xarray *xa = arg;
rcu_register_thread();
while (!test_complete) {
int i;
for (i = 0; i < 100; i++) {
xa_store(xa, i, xa_mk_value(i), GFP_KERNEL);
xa_set_mark(xa, i, XA_MARK_0);
}
for (i = 0; i < 100; i++)
xa_erase(xa, i);
}
rcu_unregister_thread();
return NULL;
}
void iteration_test2(unsigned test_duration)
{
pthread_t threads[2];
DEFINE_XARRAY(array);
int i;
printv(1, "Running iteration test 2 for %d seconds\n", test_duration);
test_complete = false;
xa_store(&array, 100, xa_mk_value(100), GFP_KERNEL);
xa_set_mark(&array, 100, XA_MARK_0);
if (pthread_create(&threads[0], NULL, iterator, &array)) {
perror("create iterator thread");
exit(1);
}
if (pthread_create(&threads[1], NULL, throbber, &array)) {
perror("create throbber thread");
exit(1);
}
sleep(test_duration);
test_complete = true;
for (i = 0; i < 2; i++) {
if (pthread_join(threads[i], NULL)) {
perror("pthread_join");
exit(1);
}
}
xa_destroy(&array);
}
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