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mm: spinlock tree_lock

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mapping->tree_lock has no read lockers.  convert the lock from an rwlock
to a spinlock.

Signed-off-by: Nick Piggin <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Reviewed-by: Peter Zijlstra <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2008-07-25 19:45:32 -07:00 • committed by Linus Torvalds
commit 19fd623127
12 changed files with 38 additions and 39 deletions
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12
mm/page-writeback.c
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@ -1088,7 +1088,7 @@ int __set_page_dirty_nobuffers(struct page *page)
if (!mapping)
return 1;
write_lock_irq(&mapping->tree_lock);
spin_lock_irq(&mapping->tree_lock);
mapping2 = page_mapping(page);
if (mapping2) { /* Race with truncate? */
BUG_ON(mapping2 != mapping);
@ -1102,7 +1102,7 @@ int __set_page_dirty_nobuffers(struct page *page)
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
write_unlock_irq(&mapping->tree_lock);
spin_unlock_irq(&mapping->tree_lock);
if (mapping->host) {
/* !PageAnon && !swapper_space */
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
@ -1258,7 +1258,7 @@ int test_clear_page_writeback(struct page *page)
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long flags;
write_lock_irqsave(&mapping->tree_lock, flags);
spin_lock_irqsave(&mapping->tree_lock, flags);
ret = TestClearPageWriteback(page);
if (ret) {
radix_tree_tag_clear(&mapping->page_tree,
@ -1269,7 +1269,7 @@ int test_clear_page_writeback(struct page *page)
__bdi_writeout_inc(bdi);
}
}
write_unlock_irqrestore(&mapping->tree_lock, flags);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestClearPageWriteback(page);
}
@ -1287,7 +1287,7 @@ int test_set_page_writeback(struct page *page)
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long flags;
write_lock_irqsave(&mapping->tree_lock, flags);
spin_lock_irqsave(&mapping->tree_lock, flags);
ret = TestSetPageWriteback(page);
if (!ret) {
radix_tree_tag_set(&mapping->page_tree,
@ -1300,7 +1300,7 @@ int test_set_page_writeback(struct page *page)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
write_unlock_irqrestore(&mapping->tree_lock, flags);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestSetPageWriteback(page);
}