mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:16:42 +07:00
496f2f93b1
This renames all random32 functions to have 'prandom_' prefix as follows: void prandom_seed(u32 seed); /* rename from srandom32() */ u32 prandom_u32(void); /* rename from random32() */ void prandom_seed_state(struct rnd_state *state, u64 seed); /* rename from prandom32_seed() */ u32 prandom_u32_state(struct rnd_state *state); /* rename from prandom32() */ The purpose of this renaming is to prevent some kernel developers from assuming that prandom32() and random32() might imply that only prandom32() was the one using a pseudo-random number generator by prandom32's "p", and the result may be a very embarassing security exposure. This concern was expressed by Theodore Ts'o. And furthermore, I'm going to introduce new functions for getting the requested number of pseudo-random bytes. If I continue to use both prandom32 and random32 prefixes for these functions, the confusion is getting worse. As a result of this renaming, "prandom_" is the common prefix for pseudo-random number library. Currently, srandom32() and random32() are preserved because it is difficult to rename too many users at once. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Robert Love <robert.w.love@intel.com> Cc: Michel Lespinasse <walken@google.com> Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu> Cc: David Laight <david.laight@aculab.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
235 lines
5.0 KiB
C
235 lines
5.0 KiB
C
#include <linux/module.h>
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#include <linux/rbtree_augmented.h>
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#include <linux/random.h>
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#include <asm/timex.h>
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#define NODES 100
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#define PERF_LOOPS 100000
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#define CHECK_LOOPS 100
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struct test_node {
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struct rb_node rb;
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u32 key;
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/* following fields used for testing augmented rbtree functionality */
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u32 val;
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u32 augmented;
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};
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static struct rb_root root = RB_ROOT;
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static struct test_node nodes[NODES];
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static struct rnd_state rnd;
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static void insert(struct test_node *node, struct rb_root *root)
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{
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struct rb_node **new = &root->rb_node, *parent = NULL;
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u32 key = node->key;
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while (*new) {
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parent = *new;
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if (key < rb_entry(parent, struct test_node, rb)->key)
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new = &parent->rb_left;
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else
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new = &parent->rb_right;
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}
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rb_link_node(&node->rb, parent, new);
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rb_insert_color(&node->rb, root);
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}
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static inline void erase(struct test_node *node, struct rb_root *root)
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{
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rb_erase(&node->rb, root);
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}
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static inline u32 augment_recompute(struct test_node *node)
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{
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u32 max = node->val, child_augmented;
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if (node->rb.rb_left) {
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child_augmented = rb_entry(node->rb.rb_left, struct test_node,
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rb)->augmented;
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if (max < child_augmented)
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max = child_augmented;
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}
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if (node->rb.rb_right) {
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child_augmented = rb_entry(node->rb.rb_right, struct test_node,
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rb)->augmented;
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if (max < child_augmented)
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max = child_augmented;
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}
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return max;
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}
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RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb,
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u32, augmented, augment_recompute)
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static void insert_augmented(struct test_node *node, struct rb_root *root)
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{
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struct rb_node **new = &root->rb_node, *rb_parent = NULL;
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u32 key = node->key;
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u32 val = node->val;
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struct test_node *parent;
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while (*new) {
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rb_parent = *new;
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parent = rb_entry(rb_parent, struct test_node, rb);
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if (parent->augmented < val)
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parent->augmented = val;
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if (key < parent->key)
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new = &parent->rb.rb_left;
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else
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new = &parent->rb.rb_right;
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}
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node->augmented = val;
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rb_link_node(&node->rb, rb_parent, new);
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rb_insert_augmented(&node->rb, root, &augment_callbacks);
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}
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static void erase_augmented(struct test_node *node, struct rb_root *root)
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{
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rb_erase_augmented(&node->rb, root, &augment_callbacks);
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}
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static void init(void)
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{
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int i;
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for (i = 0; i < NODES; i++) {
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nodes[i].key = prandom_u32_state(&rnd);
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nodes[i].val = prandom_u32_state(&rnd);
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}
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}
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static bool is_red(struct rb_node *rb)
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{
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return !(rb->__rb_parent_color & 1);
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}
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static int black_path_count(struct rb_node *rb)
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{
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int count;
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for (count = 0; rb; rb = rb_parent(rb))
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count += !is_red(rb);
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return count;
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}
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static void check(int nr_nodes)
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{
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struct rb_node *rb;
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int count = 0;
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int blacks = 0;
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u32 prev_key = 0;
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for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
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struct test_node *node = rb_entry(rb, struct test_node, rb);
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WARN_ON_ONCE(node->key < prev_key);
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WARN_ON_ONCE(is_red(rb) &&
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(!rb_parent(rb) || is_red(rb_parent(rb))));
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if (!count)
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blacks = black_path_count(rb);
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else
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WARN_ON_ONCE((!rb->rb_left || !rb->rb_right) &&
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blacks != black_path_count(rb));
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prev_key = node->key;
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count++;
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}
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WARN_ON_ONCE(count != nr_nodes);
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}
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static void check_augmented(int nr_nodes)
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{
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struct rb_node *rb;
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check(nr_nodes);
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for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
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struct test_node *node = rb_entry(rb, struct test_node, rb);
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WARN_ON_ONCE(node->augmented != augment_recompute(node));
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}
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}
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static int rbtree_test_init(void)
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{
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int i, j;
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cycles_t time1, time2, time;
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printk(KERN_ALERT "rbtree testing");
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prandom_seed_state(&rnd, 3141592653589793238ULL);
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init();
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time1 = get_cycles();
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for (i = 0; i < PERF_LOOPS; i++) {
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for (j = 0; j < NODES; j++)
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insert(nodes + j, &root);
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for (j = 0; j < NODES; j++)
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erase(nodes + j, &root);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, PERF_LOOPS);
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printk(" -> %llu cycles\n", (unsigned long long)time);
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for (i = 0; i < CHECK_LOOPS; i++) {
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init();
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for (j = 0; j < NODES; j++) {
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check(j);
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insert(nodes + j, &root);
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}
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for (j = 0; j < NODES; j++) {
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check(NODES - j);
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erase(nodes + j, &root);
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}
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check(0);
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}
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printk(KERN_ALERT "augmented rbtree testing");
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init();
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time1 = get_cycles();
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for (i = 0; i < PERF_LOOPS; i++) {
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for (j = 0; j < NODES; j++)
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insert_augmented(nodes + j, &root);
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for (j = 0; j < NODES; j++)
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erase_augmented(nodes + j, &root);
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}
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time2 = get_cycles();
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time = time2 - time1;
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time = div_u64(time, PERF_LOOPS);
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printk(" -> %llu cycles\n", (unsigned long long)time);
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for (i = 0; i < CHECK_LOOPS; i++) {
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init();
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for (j = 0; j < NODES; j++) {
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check_augmented(j);
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insert_augmented(nodes + j, &root);
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}
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for (j = 0; j < NODES; j++) {
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check_augmented(NODES - j);
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erase_augmented(nodes + j, &root);
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}
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check_augmented(0);
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}
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return -EAGAIN; /* Fail will directly unload the module */
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}
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static void rbtree_test_exit(void)
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{
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printk(KERN_ALERT "test exit\n");
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}
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module_init(rbtree_test_init)
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module_exit(rbtree_test_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michel Lespinasse");
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MODULE_DESCRIPTION("Red Black Tree test");
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