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From: FUJITA Tomonori on 31 May 2010 03:10
block uses ISA_DMA_THRESHOLD for BLK_BOUNCE_ISA. Only SCSI uses
ISA_DMA_THRESHOLD for ancient drivers with non-zero
unchecked_isa_dma. Nowadays drivers (and subsystems) use dma_mask
properly instead of ISA_DMA_THRESHOLD.

Documentation/scsi/scsi_mid_low_api.txt says:

unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing
restriction), 0=>can use full 32 bit (or better) DMA
address space

So block simply uses DMA_BIT_MASK(24) for BLK_BOUNCE_ISA for SCSI.

Signed-off-by: FUJITA Tomonori <fujita.tomonori(a)lab.ntt.co.jp>
---
include/linux/blkdev.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8b7f5e0..f95bdd1 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -709,7 +709,7 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
#define BLK_BOUNCE_HIGH -1ULL
#endif
#define BLK_BOUNCE_ANY (-1ULL)
-#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
+#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))

/*
* default timeout for SG_IO if none specified
--
1.6.5

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Prev: [PATCH net-next]atl1c: Add AR8151 v2 support and change L0s/L1 routine
Next: [PATCH 2/2] x86, MCE, fix MSR_IA32_MCI_CTL2 CMCI threshold setup