lkml.org 
[lkml]   [2006]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] Enable mprotect on huge pages
From
Date
On Mon, 2006-02-27 at 07:09, David Gibson wrote:
> On Fri, Feb 24, 2006 at 02:28:44PM -0800, Andrew Morton wrote:
> > "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> wrote:
> > >
> > > From: Zhang, Yanmin <yanmin.zhang@intel.com>
> > >
> > > 2.6.16-rc3 uses hugetlb on-demand paging, but it doesn_t support hugetlb
> > > mprotect. My patch against 2.6.16-rc3 enables this capability.
> > >
> >
> > Well I suppose that makes sense. It does assume that the normal pte
> > protection-changing APIs do the right thing on all architectures which
> > implement huge pages. That's quite possibly the case, but we should
> > confirm that.
>
> Well, it will need to be huge_ptep_get_and_clear() below, not the
> normal version.
I will change it.


> But pte_modify should be ok. I'm not sure
> pte_present() is safe, either, !pte_none() is what we use elsewhere in
> hugetlb.c.
pte_present is used in some files while !pte_none is used
in other files. Anyway, I will change it to !pte_none.


>
> And.. looks like lazy_mmu_prot_update() is unsafe, too. The only arch
> which has something here (ia64) has a function which does icache
> flushes on PAGE_SIZE only.
I already sent another patch to ia64 maillist to fix the issue.
See http://marc.theaimsgroup.com/?l=linux-ia64&m=114066414720468&w=2

Thanks.


-
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: 2006-02-27 06:43    [W:0.064 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site