Re: [PATCHSET] block: fix PIO cache coherency bug

[Jeff Garzik <jgarzik@pobox.com>]

Tejun Heo wrote:
> Hello, all.
>
> This patchset tries to fix data corruption bug caused by not handling
> cache coherency during block PIO.  This patch implements
> blk_kmap/unmap helpers which take extra @dir argument and perform
> appropriate coherency actions.  These are to block PIO what dma_map/
> unmap are to block DMA transfers.
>
> IDE, libata, SCSI, rd and md are converted.  Still left are nbd, loop
> and pktcddvd.  If I missed something, please let me know.
>
> Russell, can you please test whether this fixes the bug on arm?  If
> this fixes the bug and people agree with the approach, I'll follow up
> with patches for yet unconverted drivers and documentation update.

I ACK the libata portions, but I will let others ACK the overall 
patchset goal (hopefully the arch people).

	Jeff



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