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    Subject[PATCH] Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
    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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