aboutsummaryrefslogtreecommitdiffstats
path: root/mm/page-writeback.c
diff options
context:
space:
mode:
authorNick Piggin <npiggin@suse.de>2007-10-16 04:24:40 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 12:42:53 -0400
commit001281881067a5998384c6669bc8dbbbab8456c4 (patch)
tree6229d16c737782a36795354b218c74d4d2749752 /mm/page-writeback.c
parent557ed1fa2620dc119adb86b34c614e152a629a80 (diff)
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)
1022EXPORT_SYMBOL(test_set_page_writeback); 1022EXPORT_SYMBOL(test_set_page_writeback);
1023 1023
1024/* 1024/*
1025 * Return true if any of the pages in the mapping are marged with the 1025 * Return true if any of the pages in the mapping are marked with the
1026 * passed tag. 1026 * passed tag.
1027 */ 1027 */
1028int mapping_tagged(struct address_space *mapping, int tag) 1028int mapping_tagged(struct address_space *mapping, int tag)
1029{ 1029{
1030 unsigned long flags;
1031 int ret; 1030 int ret;
1032 1031 rcu_read_lock();
1033 read_lock_irqsave(&mapping->tree_lock, flags);
1034 ret = radix_tree_tagged(&mapping->page_tree, tag); 1032 ret = radix_tree_tagged(&mapping->page_tree, tag);
1035 read_unlock_irqrestore(&mapping->tree_lock, flags); 1033 rcu_read_unlock();
1036 return ret; 1034 return ret;
1037} 1035}
1038EXPORT_SYMBOL(mapping_tagged); 1036EXPORT_SYMBOL(mapping_tagged);