Re: [parisc-linux] Untested port of parisc_device to generic device interface

From: J.E.J. Bottomley (
Date: Sat Nov 09 2002 - 21:01:29 EST said:
> I'd like to know more about what these machines look like in the real
> world. Specifically, I am interested in the trade-off of having a
> parameter to wback_fake_consistent so that it could be enabled or
> disabled on an individual basis.

Actually, so would I. I can suspect why there might exist machines like this
(say the consistent attribute is settable at the pgd level)

> I suspect that the parameter is not worth the clutter because these
> "partially consistent" machines either have a large amount of
> consistent memory, so the case of the allocation failing in the is not
> worth supporting, or it is easy to check for consistent memory on them
> with something like "if ((unsigned long) vaddr < 0xwhatever)", but I'm
> just guessing.

Well, if it has to be done, it can be done by making alloc_consistent return a
handle rather than an address and making wback/invalidate take the handle (but
it's certainly not ideal).


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:19 EST