RE: Creating a page struct for HIGHMEM pages

["Amir Hermelin" <amir@montilio.com>]

Yes, I've tried ioremap (and placed the address in the ->virtual field), but
had problems with pre-written code that used kmap.  So, basically, what
you're saying is that I must change my code that uses kmap, or
alternatively, allocated page* below the highmem_start_page address.  Is
this correct?


-----Original Message-----
From: William Lee Irwin III [mailto:wli@holomorphy.com] 
Sent: Sunday, December 07, 2003 7:59 PM
To: Amir Hermelin
Cc: linux-kernel@vger.kernel.org
Subject: Re: Creating a page struct for HIGHMEM pages


On Sun, Dec 07, 2003 at 07:56:17PM +0200, Amir Hermelin wrote:
> I may be missing something a little more basic: I have a contiguous 
> physical memory area (IO memory), and I want to manage it with struct 
> pages.  If I'm to write to the page I need to kmap it, therefore (as I
understand it) I
> need to zero the ->virtual field.   What I don't understand is how, given
> the struct page I've allocated and filled out, is the page correlated 
> with the correct physical memory.  Where do I put the information that 
> struct page X points to physical address Y, so that when I kmap(X) I 
> get a virtual address pointing to Y?

You probably want ioremap(), not kmap().


-- wli