idr: Rename idr_for_each_entry_ext

Most places in the kernel that we need to distinguish functions by the
type of their arguments, we use '_ul' as a suffix for the unsigned long
variant, not '_ext'.  Also add kernel-doc.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>

include/linux/idr.h

@@ -88,7 +88,7 @@ int idr_alloc_cyclic(struct idr *, void *entry, int start, int end, gfp_t);
 int idr_for_each(const struct idr *,
 		 int (*fn)(int id, void *p, void *data), void *data);
 void *idr_get_next(struct idr *, int *nextid);
-void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);
+void *idr_get_next_ul(struct idr *, unsigned long *nextid);
 void *idr_replace(struct idr *, void *, unsigned long id);
 void idr_destroy(struct idr *);
 
@@ -121,45 +121,57 @@ static inline void idr_preload_end(void)
 }
 
 /**
- * idr_find - return pointer for given id
- * @idr: idr handle
- * @id: lookup key
+ * idr_find() - Return pointer for given ID.
+ * @idr: IDR handle.
+ * @id: Pointer ID.
  *
- * Return the pointer given the id it has been registered with.  A %NULL
- * return indicates that @id is not valid or you passed %NULL in
- * idr_get_new().
+ * Looks up the pointer associated with this ID.  A %NULL pointer may
+ * indicate that @id is not allocated or that the %NULL pointer was
+ * associated with this ID.
  *
  * This function can be called under rcu_read_lock(), given that the leaf
  * pointers lifetimes are correctly managed.
+ *
+ * Return: The pointer associated with this ID.
  */
 static inline void *idr_find(const struct idr *idr, unsigned long id)
 {
 	return radix_tree_lookup(&idr->idr_rt, id);
 }
 
 /**
- * idr_for_each_entry - iterate over an idr's elements of a given type
- * @idr:     idr handle
- * @entry:   the type * to use as cursor
- * @id:      id entry's key
+ * idr_for_each_entry() - Iterate over an IDR's elements of a given type.
+ * @idr: IDR handle.
+ * @entry: The type * to use as cursor
+ * @id: Entry ID.
  *
  * @entry and @id do not need to be initialized before the loop, and
- * after normal terminatinon @entry is left with the value NULL.  This
+ * after normal termination @entry is left with the value NULL.  This
  * 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)
-#define idr_for_each_entry_ext(idr, entry, id)			\
-	for (id = 0; ((entry) = idr_get_next_ext(idr, &(id))) != NULL; ++id)
 
 /**
- * idr_for_each_entry_continue - continue iteration over an idr's elements of a given type
- * @idr:     idr handle
- * @entry:   the type * to use as cursor
- * @id:      id entry's key
+ * idr_for_each_entry_ul() - Iterate over an IDR's elements of a given type.
+ * @idr: IDR handle.
+ * @entry: The type * to use as cursor.
+ * @id: Entry ID.
+ *
+ * @entry and @id do not need to be initialized before the loop, and
+ * after normal termination @entry is left with the value NULL.  This
+ * is convenient for a "not found" value.
+ */
+#define idr_for_each_entry_ul(idr, entry, id)			\
+	for (id = 0; ((entry) = idr_get_next_ul(idr, &(id))) != NULL; ++id)
+
+/**
+ * idr_for_each_entry_continue() - Continue iteration over an IDR's elements of a given type
+ * @idr: IDR handle.
+ * @entry: The type * to use as a cursor.
+ * @id: Entry ID.
  *
- * Continue to iterate over list of given type, continuing after
- * the current position.
+ * Continue to iterate over entries, continuing after the current position.
  */
 #define idr_for_each_entry_continue(idr, entry, id)			\
 	for ((entry) = idr_get_next((idr), &(id));			\

lib/idr.c

@@ -136,13 +136,13 @@ int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
 EXPORT_SYMBOL(idr_alloc_cyclic);
 
 /**
- * idr_for_each - iterate through all stored pointers
- * @idr: idr handle
- * @fn: function to be called for each pointer
- * @data: data passed to callback function
+ * idr_for_each() - Iterate through all stored pointers.
+ * @idr: IDR handle.
+ * @fn: Function to be called for each pointer.
+ * @data: Data passed to callback function.
  *
  * The callback function will be called for each entry in @idr, passing
- * the id, the pointer and the data pointer passed to this function.
+ * the ID, the entry and @data.
  *
  * If @fn returns anything other than %0, the iteration stops and that
  * value is returned from this function.
@@ -169,9 +169,9 @@ int idr_for_each(const struct idr *idr,
 EXPORT_SYMBOL(idr_for_each);
 
 /**
- * idr_get_next - Find next populated entry
- * @idr: idr handle
- * @nextid: Pointer to lowest possible ID to return
+ * idr_get_next() - Find next populated entry.
+ * @idr: IDR handle.
+ * @nextid: Pointer to an ID.
  *
  * Returns the next populated entry in the tree with an ID greater than
  * or equal to the value pointed to by @nextid.  On exit, @nextid is updated
@@ -192,7 +192,17 @@ void *idr_get_next(struct idr *idr, int *nextid)
 }
 EXPORT_SYMBOL(idr_get_next);
 
-void *idr_get_next_ext(struct idr *idr, unsigned long *nextid)
+/**
+ * idr_get_next_ul() - Find next populated entry.
+ * @idr: IDR handle.
+ * @nextid: Pointer to an ID.
+ *
+ * Returns the next populated entry in the tree with an ID greater than
+ * or equal to the value pointed to by @nextid.  On exit, @nextid is updated
+ * 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)
 {
 	struct radix_tree_iter iter;
 	void __rcu **slot;
@@ -204,7 +214,7 @@ void *idr_get_next_ext(struct idr *idr, unsigned long *nextid)
 	*nextid = iter.index;
 	return rcu_dereference_raw(*slot);
 }
-EXPORT_SYMBOL(idr_get_next_ext);
+EXPORT_SYMBOL(idr_get_next_ul);
 
 /**
  * idr_replace() - replace pointer for given ID.

net/sched/act_api.c

@@ -124,7 +124,7 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 
 	s_i = cb->args[0];
 
-	idr_for_each_entry_ext(idr, p, id) {
+	idr_for_each_entry_ul(idr, p, id) {
 		index++;
 		if (index < s_i)
 			continue;
@@ -181,7 +181,7 @@ static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 	if (nla_put_string(skb, TCA_KIND, ops->kind))
 		goto nla_put_failure;
 
-	idr_for_each_entry_ext(idr, p, id) {
+	idr_for_each_entry_ul(idr, p, id) {
 		ret = __tcf_idr_release(p, false, true);
 		if (ret == ACT_P_DELETED) {
 			module_put(ops->owner);
@@ -351,7 +351,7 @@ void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 	int ret;
 	unsigned long id = 1;
 
-	idr_for_each_entry_ext(idr, p, id) {
+	idr_for_each_entry_ul(idr, p, id) {
 		ret = __tcf_idr_release(p, false, true);
 		if (ret == ACT_P_DELETED)
 			module_put(ops->owner);