Just a small fix to make sparse happy. Signed-off-by: Michel Lespinasse <walken@google.com> Reported-by: Fengguang Wu <wfg@linux.intel.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
136 lines
2.6 KiB
C
136 lines
2.6 KiB
C
#include <linux/module.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/random.h>
|
|
#include <asm/timex.h>
|
|
|
|
#define NODES 100
|
|
#define PERF_LOOPS 100000
|
|
#define CHECK_LOOPS 100
|
|
|
|
struct test_node {
|
|
struct rb_node rb;
|
|
u32 key;
|
|
};
|
|
|
|
static struct rb_root root = RB_ROOT;
|
|
static struct test_node nodes[NODES];
|
|
|
|
static struct rnd_state rnd;
|
|
|
|
static void insert(struct test_node *node, struct rb_root *root)
|
|
{
|
|
struct rb_node **new = &root->rb_node, *parent = NULL;
|
|
|
|
while (*new) {
|
|
parent = *new;
|
|
if (node->key < rb_entry(parent, struct test_node, rb)->key)
|
|
new = &parent->rb_left;
|
|
else
|
|
new = &parent->rb_right;
|
|
}
|
|
|
|
rb_link_node(&node->rb, parent, new);
|
|
rb_insert_color(&node->rb, root);
|
|
}
|
|
|
|
static inline void erase(struct test_node *node, struct rb_root *root)
|
|
{
|
|
rb_erase(&node->rb, root);
|
|
}
|
|
|
|
static void init(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < NODES; i++)
|
|
nodes[i].key = prandom32(&rnd);
|
|
}
|
|
|
|
static bool is_red(struct rb_node *rb)
|
|
{
|
|
return !(rb->__rb_parent_color & 1);
|
|
}
|
|
|
|
static int black_path_count(struct rb_node *rb)
|
|
{
|
|
int count;
|
|
for (count = 0; rb; rb = rb_parent(rb))
|
|
count += !is_red(rb);
|
|
return count;
|
|
}
|
|
|
|
static void check(int nr_nodes)
|
|
{
|
|
struct rb_node *rb;
|
|
int count = 0;
|
|
int blacks;
|
|
u32 prev_key = 0;
|
|
|
|
for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
|
|
struct test_node *node = rb_entry(rb, struct test_node, rb);
|
|
WARN_ON_ONCE(node->key < prev_key);
|
|
WARN_ON_ONCE(is_red(rb) &&
|
|
(!rb_parent(rb) || is_red(rb_parent(rb))));
|
|
if (!count)
|
|
blacks = black_path_count(rb);
|
|
else
|
|
WARN_ON_ONCE((!rb->rb_left || !rb->rb_right) &&
|
|
blacks != black_path_count(rb));
|
|
prev_key = node->key;
|
|
count++;
|
|
}
|
|
WARN_ON_ONCE(count != nr_nodes);
|
|
}
|
|
|
|
static int rbtree_test_init(void)
|
|
{
|
|
int i, j;
|
|
cycles_t time1, time2, time;
|
|
|
|
printk(KERN_ALERT "rbtree testing");
|
|
|
|
prandom32_seed(&rnd, 3141592653589793238ULL);
|
|
init();
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < PERF_LOOPS; i++) {
|
|
for (j = 0; j < NODES; j++)
|
|
insert(nodes + j, &root);
|
|
for (j = 0; j < NODES; j++)
|
|
erase(nodes + j, &root);
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, PERF_LOOPS);
|
|
printk(" -> %llu cycles\n", (unsigned long long)time);
|
|
|
|
for (i = 0; i < CHECK_LOOPS; i++) {
|
|
init();
|
|
for (j = 0; j < NODES; j++) {
|
|
check(j);
|
|
insert(nodes + j, &root);
|
|
}
|
|
for (j = 0; j < NODES; j++) {
|
|
check(NODES - j);
|
|
erase(nodes + j, &root);
|
|
}
|
|
check(0);
|
|
}
|
|
|
|
return -EAGAIN; /* Fail will directly unload the module */
|
|
}
|
|
|
|
static void rbtree_test_exit(void)
|
|
{
|
|
printk(KERN_ALERT "test exit\n");
|
|
}
|
|
|
|
module_init(rbtree_test_init)
|
|
module_exit(rbtree_test_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Michel Lespinasse");
|
|
MODULE_DESCRIPTION("Red Black Tree test");
|