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authorNick Piggin <npiggin@suse.de>2008-07-26 04:45:32 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 21:00:06 +0200
commit19fd6231279be3c3bdd02ed99f9b0eb195978064 (patch)
treeee09121054262d73c551b57114acd855b82a7a82 /mm/vmscan.c
parentmm: lockless pagecache (diff)
downloadlinux-19fd6231279be3c3bdd02ed99f9b0eb195978064.tar.xz
linux-19fd6231279be3c3bdd02ed99f9b0eb195978064.zip
mm: spinlock tree_lock
mapping->tree_lock has no read lockers. convert the lock from an rwlock to a spinlock. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Hugh Dickins <hugh@veritas.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0075eac1cd04..8f71761bc4b7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -399,7 +399,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page)
BUG_ON(!PageLocked(page));
BUG_ON(mapping != page_mapping(page));
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
/*
* The non racy check for a busy page.
*
@@ -436,17 +436,17 @@ static int __remove_mapping(struct address_space *mapping, struct page *page)
if (PageSwapCache(page)) {
swp_entry_t swap = { .val = page_private(page) };
__delete_from_swap_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
swap_free(swap);
} else {
__remove_from_page_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
}
return 1;
cannot_free:
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
return 0;
}