lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 3 May 2010 17:33:01 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/2] Fix migration races in rmap_walk() V3

On Sat, May 01, 2010 at 03:51:10PM +0200, Johannes Weiner wrote:
> On Fri, Apr 30, 2010 at 08:28:53PM +0200, Andrea Arcangeli wrote:
> > Subject: adapt mprotect to anon_vma chain semantics
> > 
> > From: Andrea Arcangeli <aarcange@...hat.com>
> > 
> > wait_split_huge_page interface changed.
> > 
> > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> > ---
> > 
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -929,7 +929,7 @@ int change_huge_pmd(struct vm_area_struc
> >  	if (likely(pmd_trans_huge(*pmd))) {
> >  		if (unlikely(pmd_trans_splitting(*pmd))) {
> >  			spin_unlock(&mm->page_table_lock);
> > -			wait_split_huge_page(vma->anon_vma, pmd);
> > +			wait_split_huge_page(mm, pmd);
> 
> That makes mprotect-vma-arg obsolete, I guess.

Well it's needed for flush_tlb_range. Also normally we could run a
single invlpg on x86 to invalidate huge pmd tlbs, but I read some
errata for some x86, and I didn't want to take risks plus this is
common code so I can't just run a common code flush_tlb_page. In
mincore_huge_pmd probably we could pass vma->vm_mm instead of vma (as
there is not flush_tlb_range), I can change it if you prefer.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists