Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
PATCH 1/1 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 <[email protected]>
---b/block/blk-settings.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
---
block/blk-settings.c 2008-03-03 17:11:42.000000000 +0800 renamed from block/blk-settings.c 2008-03-03 17:11:25.000000000 +0800 +1 -1
@@ -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
Quoted 3 lines · yshi
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.
Signature · 1 line
Jens Axboe