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authorNick Piggin <npiggin@suse.de>2007-10-16 01:24:40 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:53 -0700
commit001281881067a5998384c6669bc8dbbbab8456c4 (patch)
tree6229d16c737782a36795354b218c74d4d2749752 /mm/page-writeback.c
parent557ed1fa2620dc119adb86b34c614e152a629a80 (diff)
downloadlwn-001281881067a5998384c6669bc8dbbbab8456c4.tar.gz
lwn-001281881067a5998384c6669bc8dbbbab8456c4.zip
mm: use lockless radix-tree probe
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 <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 44720363374c..2adb89959885 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -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);