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authorMatthew Wilcox <willy@linux.intel.com>2016-03-17 14:21:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-17 15:09:34 -0700
commit0070e28d97e72aeac2a85f538d8a452400dfe1c7 (patch)
treec81f00809c6423ba14e4de56b1497015a19b2a4a /lib/radix-tree.c
parent339e6353046dd4f675304d696a88aefdd727298e (diff)
radix_tree: loop based on shift count, not height
When we introduce entries that can cover multiple indices, we will need to stop in __radix_tree_create based on the shift, not the height. Split out for ease of bisect. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/radix-tree.c')
-rw-r--r--lib/radix-tree.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index ff91792346f6..9bb440f317c9 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -415,10 +415,10 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
slot = indirect_to_ptr(root->rnode);
height = root->height;
- shift = (height-1) * RADIX_TREE_MAP_SHIFT;
+ shift = height * RADIX_TREE_MAP_SHIFT;
offset = 0; /* uninitialised var warning */
- while (height > 0) {
+ while (shift > 0) {
if (slot == NULL) {
/* Have to add a child node. */
if (!(slot = radix_tree_node_alloc(root)))
@@ -436,11 +436,11 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
}
/* Go a level down */
+ shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
node = slot;
slot = node->slots[offset];
slot = indirect_to_ptr(slot);
- shift -= RADIX_TREE_MAP_SHIFT;
height--;
}