[PATCH 0/4] radix-tree: iterating general cleanup

[Konstantin Khlebnikov]

This patchset implements common radix-tree iteration routine and
reworks page-cache lookup functions with using it.

radix_tree_gang_lookup_*slot() now mostly unused (the last user somethere in
drivers/sh/intc/virq.c), but they are exported, we cannot remove them for now.

Also there some shmem-related radix-tree hacks can be reworked,
radix_tree_locate_item() can be removed. I already have a few extra patches.

And as usual my lovely bloat-o-meter:

add/remove: 4/3 grow/shrink: 4/4 up/down: 1232/-964 (268)
function                                     old     new   delta
radix_tree_next_chunk                          -     499    +499
static.shmem_find_get_pages_and_swap           -     404    +404
find_get_pages_tag                           354     488    +134
find_get_pages                               362     438     +76
find_get_pages_contig                        345     407     +62
__kstrtab_radix_tree_next_chunk                -      22     +22
shmem_truncate_range                        1633    1652     +19
__ksymtab_radix_tree_next_chunk                -      16     +16
radix_tree_gang_lookup_tag_slot              208     180     -28
radix_tree_gang_lookup_tag                   247     207     -40
radix_tree_gang_lookup_slot                  204     162     -42
radix_tree_gang_lookup                       231     160     -71
__lookup                                     217       -    -217
__lookup_tag                                 242       -    -242
shmem_find_get_pages_and_swap                324       -    -324

---

Konstantin Khlebnikov (4):
      bitops: implement "optimized" __find_next_bit()
      radix-tree: introduce bit-optimized iterator
      radix-tree: rewrite gang lookup with using iterator
      radix-tree: use iterators in find_get_pages* functions


 include/asm-generic/bitops/find.h |   36 +++
 include/linux/radix-tree.h        |  129 +++++++++++
 lib/radix-tree.c                  |  422 +++++++++++++------------------------
 mm/filemap.c                      |   75 ++++---
 mm/shmem.c                        |   23 +-
 5 files changed, 375 insertions(+), 310 deletions(-)

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