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mm: use lockless radix-tree probe

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Probing pages and radix_tree_tagged are lockless operations with the lockless
radix-tree.  Convert these users to RCU locking rather than using tree_lock.

Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2007-10-16 01:24:40 -07:00 • committed by Linus Torvalds
commit 0012818810
2 changed files with 5 additions and 9 deletions
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8
mm/page-writeback.c
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@ -1022,17 +1022,15 @@ int test_set_page_writeback(struct page *page)
EXPORT_SYMBOL(test_set_page_writeback);
/*
* Return true if any of the pages in the mapping are marged with the
* Return true if any of the pages in the mapping are marked with the
* passed tag.
*/
int mapping_tagged(struct address_space *mapping, int tag)
{
unsigned long flags;
int ret;
read_lock_irqsave(&mapping->tree_lock, flags);
rcu_read_lock();
ret = radix_tree_tagged(&mapping->page_tree, tag);
read_unlock_irqrestore(&mapping->tree_lock, flags);
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(mapping_tagged);