A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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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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4
mm/swapfile.c
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@ -369,13 +369,13 @@ int remove_exclusive_swap_page(struct page *page)
retval = 0;
if (p->swap_map[swp_offset(entry)] == 1) {
/* Recheck the page count with the swapcache lock held.. */
write_lock_irq(&swapper_space.tree_lock);
spin_lock_irq(&swapper_space.tree_lock);
if ((page_count(page) == 2) && !PageWriteback(page)) {
__delete_from_swap_cache(page);
SetPageDirty(page);
retval = 1;
}
write_unlock_irq(&swapper_space.tree_lock);
spin_unlock_irq(&swapper_space.tree_lock);
}
spin_unlock(&swap_lock);