linux-kernel - Re: [PATCH] mips,mm: Reinstate move

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Date:	Mon, 11 Jan 2010 11:15:43 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	linux-mips@...ux-mips.org, Carsten Otte <cotte@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <dvhltc@...ibm.com>,
	Ulrich Drepper <drepper@...il.com>
Subject: Re: [PATCH] mips,mm: Reinstate move_pte optimization

On Thu, Jan 07, 2010 at 03:32:57PM +0900, KOSAKI Motohiro wrote:

> > to include/linux/mm.h - I'd prefer to keep it private if we can.
> > But for completeness, this would involve resurrecting the 2.6.19
> > MIPS move_pte(), which makes sure mremap() move doesn't interfere
> > with our assumptions.  Something like
> > 
> > #define __HAVE_ARCH_MOVE_PTE
> > pte_t move_pte(pte_t pte, pgprot_t prot, unsigned long old_addr,
> >                                          unsigned long new_addr)
> > {
> > 	if (pte_present(pte) && is_zero_pfn(pte_pfn(pte)))
> > 		pte = mk_pte(ZERO_PAGE(new_addr), prot);
> > 	return pte;
> > }
> > 
> > in arch/mips/include/asm/pgtable.h.
> 
> I agree with resurrecting mips move_pte. At least your patch
> passed my cross compile test :)
> 
> Ralf, can you please review following patch?

Looks good.

Acked-by: Ralf Baechle <ralf@...ux-mips.org>

Thanks,

  Ralf
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