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    Subject[PATCH next/mmotm] swap: add per-partition lock for swapfile fix
    I had all cpus spinning in swap_info_get(), for the lock on an area
    being swapped off: probably because get_swap_page() forgot to unlock.

    Signed-off-by: Hugh Dickins <hughd@google.com>
    ---

    mm/swapfile.c | 5 ++---
    1 file changed, 2 insertions(+), 3 deletions(-)

    --- mmotm.orig/mm/swapfile.c 2013-01-23 17:55:39.132447115 -0800
    +++ mmotm/mm/swapfile.c 2013-01-27 10:41:45.000000000 -0800
    @@ -470,10 +470,9 @@ swp_entry_t get_swap_page(void)
    spin_unlock(&swap_lock);
    /* This is called for allocating swap entry for cache */
    offset = scan_swap_map(si, SWAP_HAS_CACHE);
    - if (offset) {
    - spin_unlock(&si->lock);
    + spin_unlock(&si->lock);
    + if (offset)
    return swp_entry(type, offset);
    - }
    spin_lock(&swap_lock);
    next = swap_list.next;
    }

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