diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 1 | ||||
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/cmdline.c | 35 | ||||
| -rw-r--r-- | lib/idr.c | 4 | ||||
| -rw-r--r-- | lib/kobject.c | 3 | ||||
| -rw-r--r-- | lib/list_debug.c | 10 | ||||
| -rw-r--r-- | lib/locking-selftest.c | 2 | ||||
| -rw-r--r-- | lib/radix-tree.c | 333 |
8 files changed, 276 insertions, 114 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d3679103a8e4..b75fed737f25 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1,6 +1,7 @@ config PRINTK_TIME bool "Show timing information on printks" + depends on PRINTK help Selecting this option causes timing information to be included in printk output. This allows you to measure diff --git a/lib/Makefile b/lib/Makefile index cf98fabaa549..fea8f9035f07 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -25,7 +25,7 @@ lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o lib-$(CONFIG_SEMAPHORE_SLEEPERS) += semaphore-sleepers.o lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o -lib-$(CONFIG_GENERIC_HWEIGHT) += hweight.o +obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o obj-$(CONFIG_PLIST) += plist.o obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o diff --git a/lib/cmdline.c b/lib/cmdline.c index 0331ed825ea7..8a5b5303bd4f 100644 --- a/lib/cmdline.c +++ b/lib/cmdline.c @@ -16,6 +16,23 @@ #include <linux/kernel.h> #include <linux/string.h> +/* + * If a hyphen was found in get_option, this will handle the + * range of numbers, M-N. This will expand the range and insert + * the values[M, M+1, ..., N] into the ints array in get_options. + */ + +static int get_range(char **str, int *pint) +{ + int x, inc_counter, upper_range; + + (*str)++; + upper_range = simple_strtol((*str), NULL, 0); + inc_counter = upper_range - *pint; + for (x = *pint; x < upper_range; x++) + *pint++ = x; + return inc_counter; +} /** * get_option - Parse integer from an option string @@ -29,6 +46,7 @@ * 0 : no int in string * 1 : int found, no subsequent comma * 2 : int found including a subsequent comma + * 3 : hyphen found to denote a range */ int get_option (char **str, int *pint) @@ -44,6 +62,8 @@ int get_option (char **str, int *pint) (*str)++; return 2; } + if (**str == '-') + return 3; return 1; } @@ -55,7 +75,8 @@ int get_option (char **str, int *pint) * @ints: integer array * * This function parses a string containing a comma-separated - * list of integers. The parse halts when the array is + * list of integers, a hyphen-separated range of _positive_ integers, + * or a combination of both. The parse halts when the array is * full, or when no more numbers can be retrieved from the * string. * @@ -72,6 +93,18 @@ char *get_options(const char *str, int nints, int *ints) res = get_option ((char **)&str, ints + i); if (res == 0) break; + if (res == 3) { + int range_nums; + range_nums = get_range((char **)&str, ints + i); + if (range_nums < 0) + break; + /* + * Decrement the result by one to leave out the + * last number in the range. The next iteration + * will handle the upper number in the range + */ + i += (range_nums - 1); + } i++; if (res == 1) break; diff --git a/lib/idr.c b/lib/idr.c index 16d2143fea48..71853531d3b0 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -33,7 +33,7 @@ #include <linux/string.h> #include <linux/idr.h> -static kmem_cache_t *idr_layer_cache; +static struct kmem_cache *idr_layer_cache; static struct idr_layer *alloc_layer(struct idr *idp) { @@ -445,7 +445,7 @@ void *idr_replace(struct idr *idp, void *ptr, int id) } EXPORT_SYMBOL(idr_replace); -static void idr_cache_ctor(void * idr_layer, kmem_cache_t *idr_layer_cache, +static void idr_cache_ctor(void * idr_layer, struct kmem_cache *idr_layer_cache, unsigned long flags) { memset(idr_layer, 0, sizeof(struct idr_layer)); diff --git a/lib/kobject.c b/lib/kobject.c index 744a4b102c7f..7ce6dc138e90 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -111,10 +111,9 @@ char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) len = get_kobj_path_length(kobj); if (len == 0) return NULL; - path = kmalloc(len, gfp_mask); + path = kzalloc(len, gfp_mask); if (!path) return NULL; - memset(path, 0x00, len); fill_kobj_path(kobj, path, len); return path; diff --git a/lib/list_debug.c b/lib/list_debug.c index 7ba9d823d388..4350ba9655bd 100644 --- a/lib/list_debug.c +++ b/lib/list_debug.c @@ -21,13 +21,15 @@ void __list_add(struct list_head *new, struct list_head *next) { if (unlikely(next->prev != prev)) { - printk(KERN_ERR "list_add corruption. next->prev should be %p, but was %p\n", - prev, next->prev); + printk(KERN_ERR "list_add corruption. next->prev should be " + "prev (%p), but was %p. (next=%p).\n", + prev, next->prev, next); BUG(); } if (unlikely(prev->next != next)) { - printk(KERN_ERR "list_add corruption. prev->next should be %p, but was %p\n", - next, prev->next); + printk(KERN_ERR "list_add corruption. prev->next should be " + "next (%p), but was %p. (prev=%p).\n", + next, prev->next, prev); BUG(); } next->prev = new; diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c index 7945787f439a..280332c1827c 100644 --- a/lib/locking-selftest.c +++ b/lib/locking-selftest.c @@ -963,7 +963,9 @@ static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) printk("failed|"); } else { unexpected_testcase_failures++; + printk("FAILED|"); + dump_stack(); } } else { testcase_successes++; diff --git a/lib/radix-tree.c b/lib/radix-tree.c index aa9bfd0bdbd1..d69ddbe43865 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -2,6 +2,7 @@ * Copyright (C) 2001 Momchil Velikov * Portions Copyright (C) 2001 Christoph Hellwig * Copyright (C) 2005 SGI, Christoph Lameter <clameter@sgi.com> + * Copyright (C) 2006 Nick Piggin * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -30,6 +31,7 @@ #include <linux/gfp.h> #include <linux/string.h> #include <linux/bitops.h> +#include <linux/rcupdate.h> #ifdef __KERNEL__ @@ -45,7 +47,9 @@ ((RADIX_TREE_MAP_SIZE + BITS_PER_LONG - 1) / BITS_PER_LONG) struct radix_tree_node { + unsigned int height; /* Height from the bottom */ unsigned int count; + struct rcu_head rcu_head; void *slots[RADIX_TREE_MAP_SIZE]; unsigned long tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS]; }; @@ -63,7 +67,7 @@ static unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH] __read_mostly; /* * Radix tree node cache. */ -static kmem_cache_t *radix_tree_node_cachep; +static struct kmem_cache *radix_tree_node_cachep; /* * Per-cpu pool of preloaded nodes @@ -100,13 +104,21 @@ radix_tree_node_alloc(struct radix_tree_root *root) rtp->nr--; } } + BUG_ON(radix_tree_is_direct_ptr(ret)); return ret; } +static void radix_tree_node_rcu_free(struct rcu_head *head) +{ + struct radix_tree_node *node = + container_of(head, struct radix_tree_node, rcu_head); + kmem_cache_free(radix_tree_node_cachep, node); +} + static inline void radix_tree_node_free(struct radix_tree_node *node) { - kmem_cache_free(radix_tree_node_cachep, node); + call_rcu(&node->rcu_head, radix_tree_node_rcu_free); } /* @@ -222,11 +234,12 @@ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index) } do { + unsigned int newheight; if (!(node = radix_tree_node_alloc(root))) return -ENOMEM; /* Increase the height. */ - node->slots[0] = root->rnode; + node->slots[0] = radix_tree_direct_to_ptr(root->rnode); /* Propagate the aggregated tag info into the new root */ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) { @@ -234,9 +247,11 @@ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index) tag_set(node, tag, 0); } + newheight = root->height+1; + node->height = newheight; node->count = 1; - root->rnode = node; - root->height++; + rcu_assign_pointer(root->rnode, node); + root->height = newheight; } while (height > root->height); out: return 0; @@ -258,6 +273,8 @@ int radix_tree_insert(struct radix_tree_root *root, int offset; int error; + BUG_ON(radix_tree_is_direct_ptr(item)); + /* Make sure the tree is high enough. */ if (index > radix_tree_maxindex(root->height)) { error = radix_tree_extend(root, index); @@ -275,11 +292,12 @@ int radix_tree_insert(struct radix_tree_root *root, /* Have to add a child node. */ if (!(slot = radix_tree_node_alloc(root))) return -ENOMEM; + slot->height = height; if (node) { - node->slots[offset] = slot; + rcu_assign_pointer(node->slots[offset], slot); node->count++; } else - root->rnode = slot; + rcu_assign_pointer(root->rnode, slot); } /* Go a level down */ @@ -295,11 +313,11 @@ int radix_tree_insert(struct radix_tree_root *root, if (node) { node->count++; - node->slots[offset] = item; + rcu_assign_pointer(node->slots[offset], item); BUG_ON(tag_get(node, 0, offset)); BUG_ON(tag_get(node, 1, offset)); } else { - root->rnode = item; + rcu_assign_pointer(root->rnode, radix_tree_ptr_to_direct(item)); BUG_ON(root_tag_get(root, 0)); BUG_ON(root_tag_get(root, 1)); } @@ -308,49 +326,54 @@ int radix_tree_insert(struct radix_tree_root *root, } EXPORT_SYMBOL(radix_tree_insert); -static inline void **__lookup_slot(struct radix_tree_root *root, - unsigned long index) +/** + * radix_tree_lookup_slot - lookup a slot in a radix tree + * @root: radix tree root + * @index: index key + * + * Returns: the slot corresponding to the position @index in the + * radix tree @root. This is useful for update-if-exists operations. + * + * This function cannot be called under rcu_read_lock, it must be + * excluded from writers, as must the returned slot for subsequent + * use by radix_tree_deref_slot() and radix_tree_replace slot. + * Caller must hold tree write locked across slot lookup and + * replace. + */ +void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index) { unsigned int height, shift; - struct radix_tree_node **slot; - - height = root->height; + struct radix_tree_node *node, **slot; - if (index > radix_tree_maxindex(height)) + node = root->rnode; + if (node == NULL) return NULL; - if (height == 0 && root->rnode) + if (radix_tree_is_direct_ptr(node)) { + if (index > 0) + return NULL; return (void **)&root->rnode; + } + + height = node->height; + if (index > radix_tree_maxindex(height)) + return NULL; shift = (height-1) * RADIX_TREE_MAP_SHIFT; - slot = &root->rnode; - while (height > 0) { - if (*slot == NULL) + do { + slot = (struct radix_tree_node **) + (node->slots + ((index>>shift) & RADIX_TREE_MAP_MASK)); + node = *slot; + if (node == NULL) return NULL; - slot = (struct radix_tree_node **) - ((*slot)->slots + - ((index >> shift) & RADIX_TREE_MAP_MASK)); shift -= RADIX_TREE_MAP_SHIFT; height--; - } + } while (height > 0); return (void **)slot; } - -/** - * radix_tree_lookup_slot - lookup a slot in a radix tree - * @root: radix tree root - * @index: index key - * - * Lookup the slot corresponding to the position @index in the radix tree - * @root. This is useful for update-if-exists operations. - */ -void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index) -{ - return __lookup_slot(root, index); -} EXPORT_SYMBOL(radix_tree_lookup_slot); /** @@ -359,13 +382,45 @@ EXPORT_SYMBOL(radix_tree_lookup_slot); * @index: index key * * Lookup the item at the position @index in the radix tree @root. + * + * This function can be called under rcu_read_lock, however the caller + * must manage lifetimes of leaf nodes (eg. RCU may also be used to free + * them safely). No RCU barriers are required to access or modify the + * returned item, however. */ void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index) { - void **slot; + unsigned int height, shift; + struct radix_tree_node *node, **slot; + + node = rcu_dereference(root->rnode); + if (node == NULL) + return NULL; + + if (radix_tree_is_direct_ptr(node)) { + if (index > 0) + return NULL; + return radix_tree_direct_to_ptr(node); + } + + height = node->height; + if (index > radix_tree_maxindex(height)) + return NULL; + + shift = (height-1) * RADIX_TREE_MAP_SHIFT; - slot = __lookup_slot(root, index); - return slot != NULL ? *slot : NULL; + do { + slot = (struct radix_tree_node **) + (node->slots + ((index>>shift) & RADIX_TREE_MAP_MASK)); + node = rcu_dereference(*slot); + if (node == NULL) + return NULL; + + shift -= RADIX_TREE_MAP_SHIFT; + height--; + } while (height > 0); + + return node; } EXPORT_SYMBOL(radix_tree_lookup); @@ -495,27 +550,30 @@ int radix_tree_tag_get(struct radix_tree_root *root, unsigned long index, unsigned int tag) { unsigned int height, shift; - struct radix_tree_node *slot; + struct radix_tree_node *node; int saw_unset_tag = 0; - height = root->height; - if (index > radix_tree_maxindex(height)) - return 0; - /* check the root's tag bit */ if (!root_tag_get(root, tag)) return 0; - if (height == 0) - return 1; + node = rcu_dereference(root->rnode); + if (node == NULL) + return 0; + + if (radix_tree_is_direct_ptr(node)) + return (index == 0); + + height = node->height; + if (index > radix_tree_maxindex(height)) + return 0; shift = (height - 1) * RADIX_TREE_MAP_SHIFT; - slot = root->rnode; for ( ; ; ) { int offset; - if (slot == NULL) + if (node == NULL) return 0; offset = (index >> shift) & RADIX_TREE_MAP_MASK; @@ -524,15 +582,15 @@ int radix_tree_tag_get(struct radix_tree_root *root, * This is just a debug check. Later, we can bale as soon as * we see an unset tag. */ - if (!tag_get(slot, tag, offset)) + if (!tag_get(node, tag, offset)) saw_unset_tag = 1; if (height == 1) { - int ret = tag_get(slot, tag, offset); + int ret = tag_get(node, tag, offset); BUG_ON(ret && saw_unset_tag); return !!ret; } - slot = slot->slots[offset]; + node = rcu_dereference(node->slots[offset]); shift -= RADIX_TREE_MAP_SHIFT; height--; } @@ -541,47 +599,45 @@ EXPORT_SYMBOL(radix_tree_tag_get); #endif static unsigned int -__lookup(struct radix_tree_root *root, void **results, unsigned long index, +__lookup(struct radix_tree_node *slot, void **results, unsigned long index, unsigned int max_items, unsigned long *next_index) { unsigned int nr_found = 0; unsigned int shift, height; - struct radix_tree_node *slot; unsigned long i; - height = root->height; - if (height == 0) { - if (root->rnode && index == 0) - results[nr_found++] = root->rnode; + height = slot->height; + if (height == 0) goto out; - } - shift = (height-1) * RADIX_TREE_MAP_SHIFT; - slot = root->rnode; for ( ; height > 1; height--) { - - for (i = (index >> shift) & RADIX_TREE_MAP_MASK ; - i < RADIX_TREE_MAP_SIZE; i++) { + i = (index >> shift) & RADIX_TREE_MAP_MASK; + for (;;) { if (slot->slots[i] != NULL) break; index &= ~((1UL << shift) - 1); index += 1UL << shift; if (index == 0) goto out; /* 32-bit wraparound */ + i++; + if (i == RADIX_TREE_MAP_SIZE) + goto out; } - if (i == RADIX_TREE_MAP_SIZE) - goto out; shift -= RADIX_TREE_MAP_SHIFT; - slot = slot->slots[i]; + slot = rcu_dereference(slot->slots[i]); + if (slot == NULL) + goto out; } /* Bottom level: grab some items */ for (i = index & RADIX_TREE_MAP_MASK; i < RADIX_TREE_MAP_SIZE; i++) { + struct radix_tree_node *node; index++; - if (slot->slots[i]) { - results[nr_found++] = slot->slots[i]; + node = slot->slots[i]; + if (node) { + results[nr_found++] = rcu_dereference(node); if (nr_found == max_items) goto out; } @@ -603,28 +659,51 @@ out: * *@results. * * The implementation is naive. + * + * Like radix_tree_lookup, radix_tree_gang_lookup may be called under + * rcu_read_lock. In this case, rather than the returned results being + * an atomic snapshot of the tree at a single point in time, the semantics + * of an RCU protected gang lookup are as though multiple radix_tree_lookups + * have been issued in individual locks, and results stored in 'results'. */ unsigned int radix_tree_gang_lookup(struct radix_tree_root *root, void **results, unsigned long first_index, unsigned int max_items) { - const unsigned long max_index = radix_tree_maxindex(root->height); + unsigned long max_index; + struct radix_tree_node *node; unsigned long cur_index = first_index; - unsigned int ret = 0; + unsigned int ret; + + node = rcu_dereference(root->rnode); + if (!node) + return 0; + if (radix_tree_is_direct_ptr(node)) { + if (first_index > 0) + return 0; + node = radix_tree_direct_to_ptr(node); + results[0] = rcu_dereference(node); + return 1; + } + + max_index = radix_tree_maxindex(node->height); + + ret = 0; while (ret < max_items) { unsigned int nr_found; unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; - nr_found = __lookup(root, results + ret, cur_index, + nr_found = __lookup(node, results + ret, cur_index, max_items - ret, &next_index); ret += nr_found; if (next_index == 0) break; cur_index = next_index; } + return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup); @@ -634,55 +713,64 @@ EXPORT_SYMBOL(radix_tree_gang_lookup); * open-coding the search. */ static unsigned int -__lookup_tag(struct radix_tree_root *root, void **results, unsigned long index, +__lookup_tag(struct radix_tree_node *slot, void **results, unsigned long index, unsigned int max_items, unsigned long *next_index, unsigned int tag) { unsigned int nr_found = 0; - unsigned int shift; - unsigned int height = root->height; - struct radix_tree_node *slot; + unsigned int shift, height; - if (height == 0) { - if (root->rnode && index == 0) - results[nr_found++] = root->rnode; + height = slot->height; + if (height == 0) goto out; - } - - shift = (height - 1) * RADIX_TREE_MAP_SHIFT; - slot = root->rnode; + shift = (height-1) * RADIX_TREE_MAP_SHIFT; - do { - unsigned long i = (index >> shift) & RADIX_TREE_MAP_MASK; + while (height > 0) { + unsigned long i = (index >> shift) & RADIX_TREE_MAP_MASK ; - for ( ; i < RADIX_TREE_MAP_SIZE; i++) { - if (tag_get(slot, tag, i)) { - BUG_ON(slot->slots[i] == NULL); + for (;;) { + if (tag_get(slot, tag, i)) break; - } index &= ~((1UL << shift) - 1); index += 1UL << shift; if (index == 0) goto out; /* 32-bit wraparound */ + i++; + if (i == RADIX_TREE_MAP_SIZE) + goto out; } - if (i == RADIX_TREE_MAP_SIZE) - goto out; height--; if (height == 0) { /* Bottom level: grab some items */ unsigned long j = index & RADIX_TREE_MAP_MASK; for ( ; j < RADIX_TREE_MAP_SIZE; j++) { + struct radix_tree_node *node; index++; - if (tag_get(slot, tag, j)) { - BUG_ON(slot->slots[j] == NULL); - results[nr_found++] = slot->slots[j]; + if (!tag_get(slot, tag, j)) + continue; + node = slot->slots[j]; + /* + * Even though the tag was found set, we need to + * recheck that we have a non-NULL node, because + * if this lookup is lockless, it may have been + * subsequently deleted. + * + * Similar care must be taken in any place that + * lookup ->slots[x] without a lock (ie. can't + * rely on its value remaining the same). + */ + if (node) { + node = rcu_dereference(node); + results[nr_found++] = node; if (nr_found == max_items) goto out; } } } shift -= RADIX_TREE_MAP_SHIFT; - slot = slot->slots[i]; - } while (height > 0); + slot = rcu_dereference(slot->slots[i]); + if (slot == NULL) + break; + } out: *next_index = index; return nr_found; @@ -706,27 +794,44 @@ radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results, unsigned long first_index, unsigned int max_items, unsigned int tag) { - const unsigned long max_index = radix_tree_maxindex(root->height); + struct radix_tree_node *node; + unsigned long max_index; unsigned long cur_index = first_index; - unsigned int ret = 0; + unsigned int ret; /* check the root's tag bit */ if (!root_tag_get(root, tag)) return 0; + node = rcu_dereference(root->rnode); + if (!node) + return 0; + + if (radix_tree_is_direct_ptr(node)) { + if (first_index > 0) + return 0; + node = radix_tree_direct_to_ptr(node); + results[0] = rcu_dereference(node); + return 1; + } + + max_index = radix_tree_maxindex(node->height); + + ret = 0; while (ret < max_items) { unsigned int nr_found; unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; - nr_found = __lookup_tag(root, results + ret, cur_index, + nr_found = __lookup_tag(node, results + ret, cur_index, max_items - ret, &next_index, tag); ret += nr_found; if (next_index == 0) break; cur_index = next_index; } + return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup_tag); @@ -742,8 +847,19 @@ static inline void radix_tree_shrink(struct radix_tree_root *root) root->rnode->count == 1 && root->rnode->slots[0]) { struct radix_tree_node *to_free = root->rnode; + void *newptr; - root->rnode = to_free->slots[0]; + /* + * We don't need rcu_assign_pointer(), since we are simply + * moving the node from one part of the tree to another. If + * it was safe to dereference the old pointer to it + * (to_free->slots[0]), it will be safe to dereference the new + * one (root->rnode). + */ + newptr = to_free->slots[0]; + if (root->height == 1) + newptr = radix_tree_ptr_to_direct(newptr); + root->rnode = newptr; root->height--; /* must only free zeroed nodes into the slab */ tag_clear(to_free, 0, 0); @@ -767,6 +883,7 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index) { struct radix_tree_path path[RADIX_TREE_MAX_PATH], *pathp = path; struct radix_tree_node *slot = NULL; + struct radix_tree_node *to_free; unsigned int height, shift; int tag; int offset; @@ -777,6 +894,7 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index) slot = root->rnode; if (height == 0 && root->rnode) { + slot = radix_tree_direct_to_ptr(slot); root_tag_clear_all(root); root->rnode = NULL; goto out; @@ -809,10 +927,17 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index) radix_tree_tag_clear(root, index, tag); } + to_free = NULL; /* Now free the nodes we do not need anymore */ while (pathp->node) { pathp->node->slots[pathp->offset] = NULL; pathp->node->count--; + /* + * Queue the node for deferred freeing after the + * last reference to it disappears (set NULL, above). + */ + if (to_free) + radix_tree_node_free(to_free); if (pathp->node->count) { if (pathp->node == root->rnode) @@ -821,13 +946,15 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index) } /* Node with zero slots in use so free it */ - radix_tree_node_free(pathp->node); - + to_free = pathp->node; pathp--; + } root_tag_clear_all(root); root->height = 0; root->rnode = NULL; + if (to_free) + radix_tree_node_free(to_free); out: return slot; @@ -846,7 +973,7 @@ int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag) EXPORT_SYMBOL(radix_tree_tagged); static void -radix_tree_node_ctor(void *node, kmem_cache_t *cachep, unsigned long flags) +radix_tree_node_ctor(void *node, struct kmem_cache *cachep, unsigned long flags) { memset(node, 0, sizeof(struct radix_tree_node)); } @@ -869,7 +996,6 @@ static __init void radix_tree_init_maxindex(void) height_to_maxindex[i] = __maxindex(i); } -#ifdef CONFIG_HOTPLUG_CPU static int radix_tree_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) @@ -889,7 +1015,6 @@ static int radix_tree_callback(struct notifier_block *nfb, } return NOTIFY_OK; } -#endif /* CONFIG_HOTPLUG_CPU */ void __init radix_tree_init(void) { |