lkml.org 
[lkml]   [2006]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 4/5] mm: add vm_insert_pfn helpler
On Wed, Oct 11, 2006 at 12:12:19PM +0200, Thomas Hellstrom wrote:
> Nick, I just realized: would it be possible to have a pgprot_t argument
> to this one, instead of it using vma->vm_pgprot?
>
> The motivation for this (DRM again) is that some architectures (powerpc)
> cannot map the AGP aperture through IO space, but needs to remap the
> page from memory with a nocache attribute set. Others need special
> pgprot settings for write-combined mappings.
>
> Now, there's a possibility to change vma->vm_pgprot during the first
> ->fault(), but again, we only have the mmap_sem in read mode.

I don't see a problem with that. It would be nice if vm_pgprot could
be kept in synch with the pte protections, but I guess a crazy
driver should be allowed to do anything it wants ;)


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-11 13:27    [W:0.073 / U:0.868 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site