[12/18] Wait: Allow bit_waitqueue to wait on a bit in a virtual compound page

[Christoph Lameter <clameter@sgi.com>]

If bit waitqueue is passed a virtual address then it must use
virt_to_head_page instead of virt_to_page.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 kernel/wait.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/kernel/wait.c
===================================================================
--- linux-2.6.orig/kernel/wait.c	2007-10-03 17:44:21.000000000 -0700
+++ linux-2.6/kernel/wait.c	2007-10-03 17:53:07.000000000 -0700
@@ -245,7 +245,7 @@ EXPORT_SYMBOL(wake_up_bit);
 fastcall 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(virt_to_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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