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lib/assoc_array: Remove smp_read_barrier_depends() 

Now that smp_read_barrier_depends() is implied by READ_ONCE(), the several
smp_read_barrier_depends() calls may be removed from lib/assoc_array.c.
This commit makes this change and marks the READ_ONCE() calls that head
address dependencies.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
Cc: David Howells <dhowells@redhat.com>
This commit is contained in:
Paul E. McKenney 2017-10-09 11:39:57 -07:00
parent 243d1a7977
commit 516df05061
1 changed files with 12 additions and 25 deletions
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37
lib/assoc_array.c
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@ -38,12 +38,10 @@ static int assoc_array_subtree_iterate(const struct assoc_array_ptr *root,
if (assoc_array_ptr_is_shortcut(cursor)) {
/* Descend through a shortcut */
shortcut = assoc_array_ptr_to_shortcut(cursor);
smp_read_barrier_depends();
cursor = READ_ONCE(shortcut->next_node);
cursor = READ_ONCE(shortcut->next_node); /* Address dependency. */
}
node = assoc_array_ptr_to_node(cursor);
smp_read_barrier_depends();
slot = 0;
/* We perform two passes of each node.
@ -55,15 +53,12 @@ static int assoc_array_subtree_iterate(const struct assoc_array_ptr *root,
*/
has_meta = 0;
for (; slot < ASSOC_ARRAY_FAN_OUT; slot++) {
ptr = READ_ONCE(node->slots[slot]);
ptr = READ_ONCE(node->slots[slot]); /* Address dependency. */
has_meta |= (unsigned long)ptr;
if (ptr && assoc_array_ptr_is_leaf(ptr)) {
/* We need a barrier between the read of the pointer
* and dereferencing the pointer - but only if we are
* actually going to dereference it.
/* We need a barrier between the read of the pointer,
* which is supplied by the above READ_ONCE().
*/
smp_read_barrier_depends();
/* Invoke the callback */
ret = iterator(assoc_array_ptr_to_leaf(ptr),
iterator_data);
@ -86,10 +81,8 @@ static int assoc_array_subtree_iterate(const struct assoc_array_ptr *root,
continue_node:
node = assoc_array_ptr_to_node(cursor);
smp_read_barrier_depends();
for (; slot < ASSOC_ARRAY_FAN_OUT; slot++) {
ptr = READ_ONCE(node->slots[slot]);
ptr = READ_ONCE(node->slots[slot]); /* Address dependency. */
if (assoc_array_ptr_is_meta(ptr)) {
cursor = ptr;
goto begin_node;
@ -98,16 +91,15 @@ static int assoc_array_subtree_iterate(const struct assoc_array_ptr *root,
finished_node:
/* Move up to the parent (may need to skip back over a shortcut) */
parent = READ_ONCE(node->back_pointer);
parent = READ_ONCE(node->back_pointer); /* Address dependency. */
slot = node->parent_slot;
if (parent == stop)
return 0;
if (assoc_array_ptr_is_shortcut(parent)) {
shortcut = assoc_array_ptr_to_shortcut(parent);
smp_read_barrier_depends();
cursor = parent;
parent = READ_ONCE(shortcut->back_pointer);
parent = READ_ONCE(shortcut->back_pointer); /* Address dependency. */
slot = shortcut->parent_slot;
if (parent == stop)
return 0;
@ -147,7 +139,7 @@ int assoc_array_iterate(const struct assoc_array *array,
void *iterator_data),
void *iterator_data)
{
struct assoc_array_ptr *root = READ_ONCE(array->root);
struct assoc_array_ptr *root = READ_ONCE(array->root); /* Address dependency. */
if (!root)
return 0;
@ -194,7 +186,7 @@ assoc_array_walk(const struct assoc_array *array,
pr_devel("-->%s()\n", __func__);
cursor = READ_ONCE(array->root);
cursor = READ_ONCE(array->root); /* Address dependency. */
if (!cursor)
return assoc_array_walk_tree_empty;
@ -216,11 +208,9 @@ assoc_array_walk(const struct assoc_array *array,
consider_node:
node = assoc_array_ptr_to_node(cursor);
smp_read_barrier_depends();
slot = segments >> (level & ASSOC_ARRAY_KEY_CHUNK_MASK);
slot &= ASSOC_ARRAY_FAN_MASK;
ptr = READ_ONCE(node->slots[slot]);
ptr = READ_ONCE(node->slots[slot]); /* Address dependency. */
pr_devel("consider slot %x [ix=%d type=%lu]\n",
slot, level, (unsigned long)ptr & 3);
@ -254,7 +244,6 @@ assoc_array_walk(const struct assoc_array *array,
cursor = ptr;
follow_shortcut:
shortcut = assoc_array_ptr_to_shortcut(cursor);
smp_read_barrier_depends();
pr_devel("shortcut to %d\n", shortcut->skip_to_level);
sc_level = level + ASSOC_ARRAY_LEVEL_STEP;
BUG_ON(sc_level > shortcut->skip_to_level);
@ -294,7 +283,7 @@ assoc_array_walk(const struct assoc_array *array,
} while (sc_level < shortcut->skip_to_level);
/* The shortcut matches the leaf's index to this point. */
cursor = READ_ONCE(shortcut->next_node);
cursor = READ_ONCE(shortcut->next_node); /* Address dependency. */
if (((level ^ sc_level) & ~ASSOC_ARRAY_KEY_CHUNK_MASK) != 0) {
level = sc_level;
goto jumped;
@ -331,20 +320,18 @@ void *assoc_array_find(const struct assoc_array *array,
return NULL;
node = result.terminal_node.node;
smp_read_barrier_depends();
/* If the target key is available to us, it's has to be pointed to by
* the terminal node.
*/
for (slot = 0; slot < ASSOC_ARRAY_FAN_OUT; slot++) {
ptr = READ_ONCE(node->slots[slot]);
ptr = READ_ONCE(node->slots[slot]); /* Address dependency. */
if (ptr && assoc_array_ptr_is_leaf(ptr)) {
/* We need a barrier between the read of the pointer
* and dereferencing the pointer - but only if we are
* actually going to dereference it.
*/
leaf = assoc_array_ptr_to_leaf(ptr);
smp_read_barrier_depends();
if (ops->compare_object(leaf, index_key))
return (void *)leaf;
}