[07/14] vcompound: bit waitqueue support

[Christoph Lameter]

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@xxxxxxx>
---
 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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