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* [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
@ 2008-03-04  9:34 yshi
  2008-03-04 10:14 ` Jens Axboe
  0 siblings, 1 reply; 2+ messages in thread
From: yshi @ 2008-03-04  9:34 UTC (permalink / raw)
  To: axboe; +Cc: linux-kernel

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

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86  systems with 4GB or upper 4GB memory
  2008-03-04  9:34 [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory yshi
@ 2008-03-04 10:14 ` Jens Axboe
  0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2008-03-04 10:14 UTC (permalink / raw)
  To: yshi; +Cc: linux-kernel

On Tue, Mar 04 2008, yshi wrote:
> 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.

Looks good, applied.

-- 
Jens Axboe


^ permalink raw reply	[flat|nested] 2+ messages in thread

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2008-03-04  9:34 [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory yshi
2008-03-04 10:14 ` Jens Axboe

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