David Young <dyoung@pobox.com> writes:

> On Fri, Apr 27, 2007 at 12:48:33AM +0900, ITOH Yasufumi wrote:
>>  - caddr_t removal, expecting it will soon be reverted :D
>
> It will not be reverted.
>
>>  - volatiles in DMA structure, since it should not be needed
>>    with proper bus_dmamap_sync(9)s
>
> Volatiles are needed on shared data structures, regardless of whether
> you use bus_dmamap_sync() properly.

Are you talking about data structures shared between the kernel top
half and bottom half? If so, I think I know what you're saying here,
but I'd like to say that I consider this use of volatile, while
expedient, to be a problematic workaround for a deficient spl()
implementation.

        - Nathan