The patch titled
block: fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
has been added to the -mm tree. Its filename is
block-fix-dma-access-of-block-device-in-64-bit-kernel-on-some-non-x86-systems-with-4gb-or-upper-4gb-memory.patch
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------------------------------------------------------
Subject: block: fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
From: yshi <yang.shi@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
block/blk-settings.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN block/blk-settings.c~block-fix-dma-access-of-block-device-in-64-bit-kernel-on-some-non-x86-systems-with-4gb-or-upper-4gb-memory block/blk-settings.c
--- a/block/blk-settings.c~block-fix-dma-access-of-block-device-in-64-bit-kernel-on-some-non-x86-systems-with-4gb-or-upper-4gb-memory
+++ a/block/blk-settings.c
@@ -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
_
Patches currently in -mm which might be from yang.shi@xxxxxxxxxxxxx are
block-fix-dma-access-of-block-device-in-64-bit-kernel-on-some-non-x86-systems-with-4gb-or-upper-4gb-memory.patch
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