Re: Regarding consistent_alloc

[Matt Porter <porter@cox.net>]

On Fri, Dec 06, 2002 at 11:56:22AM -0500, Dan Malek wrote:
> Matt Porter wrote:
>
>  > ....  If you
> > want the kernel virtual address then you can apply __va to that.
>
> Errr....no, you can't.  That would give you the cached mapping.
> You need to hang on to both the dma_handle (the phys address token)
> and the virtual address returned by the function.  That's why both
> are returned.

That's what I said...but you clipped it out.  Once again,
consistent_alloc provides the caller everything they need.
An uncached mapping, a phys address, and from that you can use
__va() to get the cached mapping.

Seemed clear enough to me the first time.  My definition of a
"kernel virtual address" is the lowmem cached mapping.  If
I meant the uncached mapping I would have said it was a "kernel
vmalloc address" or something. :)

Regards,
--
Matt Porter
porter@cox.net
This is Linux Country. On a quiet night, you can hear Windows reboot.

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