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    Subject[07/14] vcompound: bit waitqueue support
    If bit_waitqueue is passed a vmalloc address then it must use
    vmalloc_head_page() instead of virt_to_page().

    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    ---
    kernel/wait.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    Index: linux-2.6.25-rc5-mm1/kernel/wait.c
    ===================================================================
    --- linux-2.6.25-rc5-mm1.orig/kernel/wait.c 2008-03-20 20:03:51.141901370 -0700
    +++ linux-2.6.25-rc5-mm1/kernel/wait.c 2008-03-20 20:07:57.266856571 -0700
    @@ -9,6 +9,7 @@
    #include <linux/mm.h>
    #include <linux/wait.h>
    #include <linux/hash.h>
    +#include <linux/vmalloc.h>

    void init_waitqueue_head(wait_queue_head_t *q)
    {
    @@ -245,7 +246,7 @@ EXPORT_SYMBOL(wake_up_bit);
    wait_queue_head_t *bit_waitqueue(void *word, int bit)
    {
    const int shift = BITS_PER_LONG == 32 ? 5 : 6;
    - const struct zone *zone = page_zone(virt_to_page(word));
    + const struct zone *zone = page_zone(vcompound_head_page(word));
    unsigned long val = (unsigned long)word << shift | bit;

    return &zone->wait_table[hash_long(val, zone->wait_table_bits)];
    --


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