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Commit 410ef736 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'xarray-5.4' of git://git.infradead.org/users/willy/linux-dax 

Pull XArray fixes from Matthew Wilcox:
 "These all fix various bugs, some of which people have tripped over and
  some of which have been caught by automatic tools"

* tag 'xarray-5.4' of git://git.infradead.org/users/willy/linux-dax:
  idr: Fix idr_alloc_u32 on 32-bit systems
  idr: Fix integer overflow in idr_for_each_entry
  radix tree: Remove radix_tree_iter_find
  idr: Fix idr_get_next_ul race with idr_remove
  XArray: Fix xas_next() with a single entry at 0
parents 4d8b3262 b7e9728f

include/linux/idr.h

+1 −1
Original line number Diff line number Diff line
@@ -185,7 +185,7 @@ static inline void idr_preload_end(void) 
 * is convenient for a "not found" value.

 */

#define idr_for_each_entry(idr, entry, id)			\

	for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; ++id)

	for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; id += 1U)



/**

 * idr_for_each_entry_ul() - Iterate over an IDR's elements of a given type.

include/linux/radix-tree.h

+0 −18
Original line number Diff line number Diff line
@@ -315,24 +315,6 @@ radix_tree_iter_lookup(const struct radix_tree_root *root, 
	return radix_tree_next_chunk(root, iter, RADIX_TREE_ITER_CONTIG);

}



/**

 * radix_tree_iter_find - find a present entry

 * @root: radix tree root

 * @iter: iterator state

 * @index: start location

 *

 * This function returns the slot containing the entry with the lowest index

 * which is at least @index.  If @index is larger than any present entry, this

 * function returns NULL.  The @iter is updated to describe the entry found.

 */

static inline void __rcu **

radix_tree_iter_find(const struct radix_tree_root *root,

			struct radix_tree_iter *iter, unsigned long index)

{

	radix_tree_iter_init(iter, index);

	return radix_tree_next_chunk(root, iter, 0);

}



/**

 * radix_tree_iter_retry - retry this chunk of the iteration

 * @iter:	iterator state

lib/idr.c

+11 −20
Original line number Diff line number Diff line
@@ -215,7 +215,7 @@ int idr_for_each(const struct idr *idr, 
EXPORT_SYMBOL(idr_for_each);



/**

 * idr_get_next() - Find next populated entry.

 * idr_get_next_ul() - Find next populated entry.

 * @idr: IDR handle.

 * @nextid: Pointer to an ID.

 *
@@ -224,7 +224,7 @@ EXPORT_SYMBOL(idr_for_each); 
 * to the ID of the found value.  To use in a loop, the value pointed to by

 * nextid must be incremented by the user.

 */

void *idr_get_next(struct idr *idr, int *nextid)

void *idr_get_next_ul(struct idr *idr, unsigned long *nextid)

{

	struct radix_tree_iter iter;

	void __rcu **slot;
@@ -245,18 +245,14 @@ void *idr_get_next(struct idr *idr, int *nextid) 
	}

	if (!slot)

		return NULL;

	id = iter.index + base;



	if (WARN_ON_ONCE(id > INT_MAX))

		return NULL;



	*nextid = id;

	*nextid = iter.index + base;

	return entry;

}

EXPORT_SYMBOL(idr_get_next);

EXPORT_SYMBOL(idr_get_next_ul);



/**

 * idr_get_next_ul() - Find next populated entry.

 * idr_get_next() - Find next populated entry.

 * @idr: IDR handle.

 * @nextid: Pointer to an ID.

 *
@@ -265,22 +261,17 @@ EXPORT_SYMBOL(idr_get_next); 
 * to the ID of the found value.  To use in a loop, the value pointed to by

 * nextid must be incremented by the user.

 */

void *idr_get_next_ul(struct idr *idr, unsigned long *nextid)

void *idr_get_next(struct idr *idr, int *nextid)

{

	struct radix_tree_iter iter;

	void __rcu **slot;

	unsigned long base = idr->idr_base;

	unsigned long id = *nextid;

	void *entry = idr_get_next_ul(idr, &id);



	id = (id < base) ? 0 : id - base;

	slot = radix_tree_iter_find(&idr->idr_rt, &iter, id);

	if (!slot)

	if (WARN_ON_ONCE(id > INT_MAX))

		return NULL;



	*nextid = iter.index + base;

	return rcu_dereference_raw(*slot);

	*nextid = id;

	return entry;

}

EXPORT_SYMBOL(idr_get_next_ul);

EXPORT_SYMBOL(idr_get_next);



/**

 * idr_replace() - replace pointer for given ID.

lib/radix-tree.c

+1 −1
Original line number Diff line number Diff line
@@ -1529,7 +1529,7 @@ void __rcu **idr_get_free(struct radix_tree_root *root, 
			offset = radix_tree_find_next_bit(node, IDR_FREE,

							offset + 1);

			start = next_index(start, node, offset);

			if (start > max)

			if (start > max || start == 0)

				return ERR_PTR(-ENOSPC);

			while (offset == RADIX_TREE_MAP_SIZE) {

				offset = node->offset + 1;

lib/test_xarray.c

+24 −0
Original line number Diff line number Diff line
@@ -1110,6 +1110,28 @@ static noinline void check_find_entry(struct xarray *xa) 
	XA_BUG_ON(xa, !xa_empty(xa));

}



static noinline void check_move_tiny(struct xarray *xa)

{

	XA_STATE(xas, xa, 0);



	XA_BUG_ON(xa, !xa_empty(xa));

	rcu_read_lock();

	XA_BUG_ON(xa, xas_next(&xas) != NULL);

	XA_BUG_ON(xa, xas_next(&xas) != NULL);

	rcu_read_unlock();

	xa_store_index(xa, 0, GFP_KERNEL);

	rcu_read_lock();

	xas_set(&xas, 0);

	XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));

	XA_BUG_ON(xa, xas_next(&xas) != NULL);

	xas_set(&xas, 0);

	XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));

	XA_BUG_ON(xa, xas_prev(&xas) != NULL);

	rcu_read_unlock();

	xa_erase_index(xa, 0);

	XA_BUG_ON(xa, !xa_empty(xa));

}



static noinline void check_move_small(struct xarray *xa, unsigned long idx)

{

	XA_STATE(xas, xa, 0);
@@ -1217,6 +1239,8 @@ static noinline void check_move(struct xarray *xa) 


	xa_destroy(xa);



	check_move_tiny(xa);



	for (i = 0; i < 16; i++)

		check_move_small(xa, 1UL << i);