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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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11
mm/migrate.c
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@ -323,7 +323,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
return 0;
}
write_lock_irq(&mapping->tree_lock);
spin_lock_irq(&mapping->tree_lock);
pslot = radix_tree_lookup_slot(&mapping->page_tree,
page_index(page));
@ -331,12 +331,12 @@ static int migrate_page_move_mapping(struct address_space *mapping,
expected_count = 2 + !!PagePrivate(page);
if (page_count(page) != expected_count ||
(struct page *)radix_tree_deref_slot(pslot) != page) {
write_unlock_irq(&mapping->tree_lock);
spin_unlock_irq(&mapping->tree_lock);
return -EAGAIN;
}
if (!page_freeze_refs(page, expected_count)) {
write_unlock_irq(&mapping->tree_lock);
spin_unlock_irq(&mapping->tree_lock);
return -EAGAIN;
}
@ -373,10 +373,9 @@ static int migrate_page_move_mapping(struct address_space *mapping,
__dec_zone_page_state(page, NR_FILE_PAGES);
__inc_zone_page_state(newpage, NR_FILE_PAGES);
write_unlock_irq(&mapping->tree_lock);
if (!PageSwapCache(newpage)) {
spin_unlock_irq(&mapping->tree_lock);
if (!PageSwapCache(newpage))
mem_cgroup_uncharge_cache_page(page);
}
return 0;
}