lkml.org 
[lkml]   [2006]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/3] Fix COW D-cache aliasing on fork
On Fri, Oct 20, 2006 at 02:12:11PM -0700, Linus Torvalds wrote:
> On Fri, 20 Oct 2006, Russell King wrote:
> > Well, looking at do_wp_page() I'm now quite concerned about ARM and COW.
> > I can't see how this code could _possibly_ work with a virtually indexed
> > cache as it stands. Yet, the kernel does appear to work.
>
> It really shouldn't need any extra code, exactly because by the time it
> hits any page-fault, the caches had better be in sync with the physical
> page contents _anyway_ (yes, being virtual, the caches will _duplicate_
> the contents, but since the pages are read-only, that aliasing should be
> perfectly fine).

Oh, of course! That explains why it actually works as expected! Thanks
for filling back in that bit of swapped-out-years-ago-and-lost information.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
-
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: 2006-10-20 23:31    [W:0.096 / U:0.732 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site