Messages in this thread Patch in this message | | | Date | Tue, 04 Mar 2008 17:34:19 +0800 | From | yshi <> | Subject | [PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory |
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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
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