lkml.org 
[lkml]   [2006]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [patch 2/2] mspec driver
From
Date
>>>>> "Nick" == Nick Piggin <nickpiggin@yahoo.com.au> writes:

Nick> Jes Sorensen wrote:
>> + vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP);

Nick> VM_PFNMAP actually has a fairly specific meaning [unlike the
Nick> rest of them :)] so you should be careful with it. Actually if
Nick> you set vm_pgoff in the right way, then that should enable you
Nick> to do COWs on these areas if that is what you want.

Yup, I went through that when I started using it. I think you guided
me through it :-)

We don't want COW here as the access is backed by special behavior in
the memory controller. We only allow shared mappings for that reason.

Cheers,
Jes
-
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: 2006-03-17 15:06    [W:0.046 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site