From: yshi <yang.shi@windriver.com>
To: axboe@kernel.dk
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
Date: Tue, 04 Mar 2008 17:34:19 +0800 [thread overview]
Message-ID: <47CD179B.3000806@windriver.com> (raw)
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 <yang.shi@windriver.com>
---
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
next reply other threads:[~2008-03-04 9:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 9:34 yshi [this message]
2008-03-04 10:14 ` [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory Jens Axboe
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