Re: [RFC][patch 0/2] mm: remove PageReserved

Arjan van de Ven
2005-08-09T09:49:44Z

On Tue, 2005-08-09 at 19:31 +1000, Nick Piggin wrote:
> Arjan van de Ven wrote:
> > On Tue, 2005-08-09 at 08:08 +0100, Russell King wrote:
>
> >>Can we straighten out the terminology so it's less confusing please?
> >>
> >
> >
> > and..... can we make a general page_is_ram() function that does what it
> > says? on x86 it can go via the e820 table, other architectures can do
> > whatever they need....
> >
>
> That would be very helpful. That should cover the remaining (ab)users
> of PageReserved.
>
> It would probably be fastest to implement this with a page flag,
> however if swsusp and ioremap are the only users then it shouldn't
> be a problem to go through slower lookups (and this would remove the
> need for the PageValidRAM flag that I had worried about earlier).

if you want I have implementations of this for x86, x86_64 and iirc ia64
(not 100% sure about the later). None of these use a page flag, but use
the same information the kernel uses during bootup to find ram.