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| author | Matthew Wilcox <willy@linux.intel.com> | 2016-12-14 15:08:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:10 -0800 |
| commit | bc412fca6edc25bbbe28b6449512e15ebb1573ae (patch) | |
| tree | f03aa2b485b88b3510f3a97a67c35c66b7df3611 /lib | |
| parent | 9498d2bb34b0866829c313569df35e77a83f12eb (diff) | |
| download | linux-bc412fca6edc25bbbe28b6449512e15ebb1573ae.tar.gz linux-bc412fca6edc25bbbe28b6449512e15ebb1573ae.tar.bz2 linux-bc412fca6edc25bbbe28b6449512e15ebb1573ae.zip | |
radix-tree: make radix_tree_find_next_bit more useful
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.
Link: http://lkml.kernel.org/r/1480369871-5271-52-git-send-email-mawilcox@linuxonhyperv.com
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/radix-tree.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index a90a4371deb8..368052ac468a 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__ @@ -1160,9 +1159,7 @@ 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) { |