From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20071004040004.482614498@sgi.com> References: <20071004035935.042951211@sgi.com> Date: Wed, 03 Oct 2007 20:59:47 -0700 From: Christoph Lameter Subject: [12/18] Wait: Allow bit_waitqueue to wait on a bit in a virtual compound page Content-Disposition: inline; filename=vcompound_wait_on_virtually_mapped_object Sender: owner-linux-mm@kvack.org Return-Path: To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: 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 --- 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)]; -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org