linux-kernel - [PATCH 16/29] radix-tree: Make radix_tree_find_next

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Message-Id: <1479341856-30320-19-git-send-email-mawilcox@linuxonhyperv.com>
Date:   Wed, 16 Nov 2016 16:16:43 -0800
From:   Matthew Wilcox <mawilcox@...uxonhyperv.com>
To:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH 16/29] radix-tree: Make radix_tree_find_next_bit more useful

From: Matthew Wilcox <willy@...ux.intel.com>

Since this function is specialised to the radix tree, pass in the node
and tag to calculate the address of the bitmap in radix_tree_find_next_bit()
instead of the caller.  Likewise, there is no need to pass in the size of
the bitmap.

Signed-off-by: Matthew Wilcox <willy@...radead.org>
---
 lib/radix-tree.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index bf1303f..2c3fac4 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -191,13 +191,12 @@ static inline int any_tag_set(struct radix_tree_node *node, unsigned int tag)
  * Returns next bit offset, or size if nothing found.
  */
 static __always_inline unsigned long
-radix_tree_find_next_bit(const unsigned long *addr,
-			 unsigned long size, unsigned long offset)
+radix_tree_find_next_bit(struct radix_tree_node *node, unsigned int tag,
+			 unsigned long offset)
 {
-	if (!__builtin_constant_p(size))
-		return find_next_bit(addr, size, offset);
+	const unsigned long *addr = node->tags[tag];
 
-	if (offset < size) {
+	if (offset < RADIX_TREE_MAP_SIZE) {
 		unsigned long tmp;
 
 		addr += offset / BITS_PER_LONG;
@@ -205,14 +204,14 @@ radix_tree_find_next_bit(const unsigned long *addr,
 		if (tmp)
 			return __ffs(tmp) + offset;
 		offset = (offset + BITS_PER_LONG) & ~(BITS_PER_LONG - 1);
-		while (offset < size) {
+		while (offset < RADIX_TREE_MAP_SIZE) {
 			tmp = *++addr;
 			if (tmp)
 				return __ffs(tmp) + offset;
 			offset += BITS_PER_LONG;
 		}
 	}
-	return size;
+	return RADIX_TREE_MAP_SIZE;
 }
 
 #ifndef __KERNEL__
@@ -1197,9 +1196,7 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
 				return NULL;
 
 			if (flags & RADIX_TREE_ITER_TAGGED)
-				offset = radix_tree_find_next_bit(
-						node->tags[tag],
-						RADIX_TREE_MAP_SIZE,
+				offset = radix_tree_find_next_bit(node, tag,
 						offset + 1);
 			else
 				while (++offset	< RADIX_TREE_MAP_SIZE) {
-- 
2.10.2