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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-05-31 15:59:03 +0900 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 18:15:49 +0200 |
| commit | bfe172310e58225f0d07f9354b683abacbd6a0d8 (patch) | |
| tree | 6f50393419bd29dabb27316e6875bc5715816789 /block | |
| parent | b375a612ad931264b71cf162d692b4420f2578a9 (diff) | |
block: kill ISA_DMA_THRESHOLD usage
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@lab.ntt.co.jp>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions