return NULL;
do {
- cpuset_mems_cookie = get_mems_allowed();
+ cpuset_mems_cookie = read_mems_allowed_begin();
zonelist = node_zonelist(slab_node(), flags);
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
struct kmem_cache_node *n;
object = get_partial_node(s, n, c, flags);
if (object) {
/*
- * Return the object even if
- * put_mems_allowed indicated that
- * the cpuset mems_allowed was
- * updated in parallel. It's a
- * harmless race between the alloc
- * and the cpuset update.
+ * Don't check read_mems_allowed_retry()
+ * here - if mems_allowed was updated in
+ * parallel, that was a harmless race
+ * between allocation and the cpuset
+ * update
*/
- put_mems_allowed(cpuset_mems_cookie);
return object;
}
}
}
- } while (!put_mems_allowed(cpuset_mems_cookie));
+ } while (read_mems_allowed_retry(cpuset_mems_cookie));
#endif
return NULL;
}
if (!rc) {
/*
- * We do the same lock strategy around sysfs_slab_add, see
- * __kmem_cache_create. Because this is pretty much the last
+ * Since slab_attr_store may take the slab_mutex, we should
+ * release the lock while removing the sysfs entry in order to
+ * avoid a deadlock. Because this is pretty much the last
* operation we do and the lock will be released shortly after
* that in slab_common.c, we could just move sysfs_slab_remove
* to a later point in common code. We should do that when we
return 0;
memcg_propagate_slab_attrs(s);
- mutex_unlock(&slab_mutex);
err = sysfs_slab_add(s);
- mutex_lock(&slab_mutex);
-
if (err)
kmem_cache_close(s);