Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757565AbYCDJe1 (ORCPT ); Tue, 4 Mar 2008 04:34:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751431AbYCDJeO (ORCPT ); Tue, 4 Mar 2008 04:34:14 -0500 Received: from mail.windriver.com ([147.11.1.11]:56104 "EHLO mail.wrs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751311AbYCDJeN (ORCPT ); Tue, 4 Mar 2008 04:34:13 -0500 Message-ID: <47CD179B.3000806@windriver.com> Date: Tue, 04 Mar 2008 17:34:19 +0800 From: yshi User-Agent: Thunderbird 2.0.0.6 (X11/20070728) MIME-Version: 1.0 To: axboe@kernel.dk CC: linux-kernel Subject: [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 04 Mar 2008 09:34:07.0379 (UTC) FILETIME=[E4B9E630:01C87DDA] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1118 Lines: 28 For some non-x86 systems with 4GB or upper 4GB memory, we need increase the range of addresses that can be used for direct DMA in 64-bit kernel. Signed-off-by: Yang Shi --- b/block/blk-settings.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- --- a/block/blk-settings.c 2008-03-03 17:11:25.000000000 +0800 +++ b/block/blk-settings.c 2008-03-03 17:11:42.000000000 +0800 @@ -140,7 +140,7 @@ void blk_queue_bounce_limit(struct reque /* Assume anything <= 4GB can be handled by IOMMU. Actually some IOMMUs can handle everything, but I don't know of a way to test this here. */ - if (b_pfn < (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) + if (b_pfn <= (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1; q->bounce_pfn = max_low_pfn; #else -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/