linux-kernel - Re: [PATCH] mm: Save soft-dirty bits on file pages

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Message-ID: <20130729141417.GM2524@moon>
Date:	Mon, 29 Jul 2013 18:14:17 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] mm: Save soft-dirty bits on file pages

On Mon, Jul 29, 2013 at 06:08:55PM +0400, Pavel Emelyanov wrote:
> >  
> > -	if (!pte_none(*pte))
> > +	ptfile = pgoff_to_pte(pgoff);
> > +
> > +	if (!pte_none(*pte)) {
> > +#ifdef CONFIG_MEM_SOFT_DIRTY
> > +		if (pte_present(*pte) &&
> > +		    pte_soft_dirty(*pte))
> 
> I think there's no need in wrapping every such if () inside #ifdef CONFIG_...,
> since the pte_soft_dirty() routine itself would be 0 for non-soft-dirty case
> and compiler would optimize this code out.

If only I'm not missing something obvious, this code compiles not only on x86,
CONFIG_MEM_SOFT_DIRTY depends on x86 (otherwise I'll have to implement
pte_soft_dirty for all archs).
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