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authorMatthew Wilcox <willy@linux.intel.com>2016-12-15 02:09:04 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-15 03:04:10 +0300
commit2791653a6814d170fa893344618563a7b1da95c6 (patch)
tree635c8ca43b49ac15836e5d4b5786d64733661755 /include/linux/radix-tree.h
parente157b555945fb16ddc6cce605a1eb6b4135ea5f1 (diff)
downloadlinux-2791653a6814d170fa893344618563a7b1da95c6.tar.xz
radix-tree: add radix_tree_split_preload()
Calculate how many nodes we need to allocate to split an old_order entry into multiple entries, each of size new_order. The test suite checks that we allocated exactly the right number of nodes; neither too many (checked by rtp->nr == 0), nor too few (checked by comparing nr_allocated before and after the call to radix_tree_split()). Link: http://lkml.kernel.org/r/1480369871-5271-60-git-send-email-mawilcox@linuxonhyperv.com Signed-off-by: Matthew Wilcox <willy@linux.intel.com> 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 'include/linux/radix-tree.h')
-rw-r--r--include/linux/radix-tree.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 1f4b56120de8..5dea8f6440e4 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -345,6 +345,7 @@ static inline void radix_tree_preload_end(void)
preempt_enable();
}
+int radix_tree_split_preload(unsigned old_order, unsigned new_order, gfp_t);
int radix_tree_split(struct radix_tree_root *, unsigned long index,
unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,