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radix tree: constify some pointers

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If we're just getting the value of a tag, or looking up an entry,
we won't modify the radix tree, so we can declare these functions as
taking a const pointer.  Mostly for documentation purposes, though it
might help code generation.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Matthew Wilcox
2016-12-19 17:43:19 -05:00
parent 15f2e88ddd
commit 35534c869c
2 changed files with 42 additions and 37 deletions
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22
include/linux/radix-tree.h
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@@ -125,7 +125,7 @@ do { \
(root)->rnode = NULL; \
} while (0)
static inline bool radix_tree_empty(struct radix_tree_root *root)
static inline bool radix_tree_empty(const struct radix_tree_root *root)
{
return root->rnode == NULL;
}
@@ -294,10 +294,10 @@ static inline int radix_tree_insert(struct radix_tree_root *root,
{
return __radix_tree_insert(root, index, 0, entry);
}
void *__radix_tree_lookup(struct radix_tree_root *root, unsigned long index,
void *__radix_tree_lookup(const struct radix_tree_root *, unsigned long index,
struct radix_tree_node **nodep, void ***slotp);
void *radix_tree_lookup(struct radix_tree_root *, unsigned long);
void **radix_tree_lookup_slot(struct radix_tree_root *, unsigned long);
void *radix_tree_lookup(const struct radix_tree_root *, unsigned long);
void **radix_tree_lookup_slot(const struct radix_tree_root *, unsigned long);
typedef void (*radix_tree_update_node_t)(struct radix_tree_node *, void *);
void __radix_tree_replace(struct radix_tree_root *root,
struct radix_tree_node *node,
@@ -316,10 +316,10 @@ void *radix_tree_delete(struct radix_tree_root *, unsigned long);
void radix_tree_clear_tags(struct radix_tree_root *root,
struct radix_tree_node *node,
void **slot);
unsigned int radix_tree_gang_lookup(struct radix_tree_root *root,
unsigned int radix_tree_gang_lookup(const struct radix_tree_root *,
void **results, unsigned long first_index,
unsigned int max_items);
unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root,
unsigned int radix_tree_gang_lookup_slot(const struct radix_tree_root *,
void ***results, unsigned long *indices,
unsigned long first_index, unsigned int max_items);
int radix_tree_preload(gfp_t gfp_mask);
@@ -330,19 +330,19 @@ void *radix_tree_tag_set(struct radix_tree_root *root,
unsigned long index, unsigned int tag);
void *radix_tree_tag_clear(struct radix_tree_root *root,
unsigned long index, unsigned int tag);
int radix_tree_tag_get(struct radix_tree_root *root,
int radix_tree_tag_get(const struct radix_tree_root *,
unsigned long index, unsigned int tag);
void radix_tree_iter_tag_set(struct radix_tree_root *root,
const struct radix_tree_iter *iter, unsigned int tag);
unsigned int
radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
radix_tree_gang_lookup_tag(const struct radix_tree_root *, void **results,
unsigned long first_index, unsigned int max_items,
unsigned int tag);
unsigned int
radix_tree_gang_lookup_tag_slot(struct radix_tree_root *root, void ***results,
radix_tree_gang_lookup_tag_slot(const struct radix_tree_root *, void ***results,
unsigned long first_index, unsigned int max_items,
unsigned int tag);
int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag);
int radix_tree_tagged(const struct radix_tree_root *root, unsigned int tag);
static inline void radix_tree_preload_end(void)
{
@@ -395,7 +395,7 @@ radix_tree_iter_init(struct radix_tree_iter *iter, unsigned long start)
* Also it fills @iter with data about chunk: position in the tree (index),
* its end (next_index), and constructs a bit mask for tagged iterating (tags).
*/
void **radix_tree_next_chunk(struct radix_tree_root *root,
void **radix_tree_next_chunk(const struct radix_tree_root *,
struct radix_tree_iter *iter, unsigned flags);
/**