linux-kernel - Re: [PATCH 2/3] mm: thp: Fix the update_mmu_cache() last argument passing in mm/huge

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Message-Id: <20120918123331.6ca5833c.akpm@linux-foundation.org>
Date:	Tue, 18 Sep 2012 12:33:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Will Deacon <will.deacon@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mhocko@...e.cz, Catalin Marinas <catalin.marinas@....com>,
	Steve Capper <steve.capper@....com>
Subject: Re: [PATCH 2/3] mm: thp: Fix the update_mmu_cache() last argument
 passing in mm/huge_memory.c

On Sat, 15 Sep 2012 15:38:33 +0200
Ralf Baechle <ralf@...ux-mips.org> wrote:

> On Tue, Sep 11, 2012 at 05:47:15PM +0100, Will Deacon wrote:
> 
> > The update_mmu_cache() takes a pointer (to pte_t by default) as the last
> > argument but the huge_memory.c passes a pmd_t value. The patch changes
> > the argument to the pmd_t * pointer.
> > 
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > Signed-off-by: Steve Capper <steve.capper@....com>
> > Signed-off-by: Will Deacon <will.deacon@....com>
> > ---
> >  mm/huge_memory.c |    6 +++---
> >  1 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index 57c4b93..4aa6d02 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -934,7 +934,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
> >  		entry = pmd_mkyoung(orig_pmd);
> >  		entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
> >  		if (pmdp_set_access_flags(vma, haddr, pmd, entry,  1))
> > -			update_mmu_cache(vma, address, entry);
> > +			update_mmu_cache(vma, address, pmd);
> 
> Documentation/cachetlb.txt will need an update as well.  Currently it says:
> 
> 5) void update_mmu_cache(struct vm_area_struct *vma,
>                          unsigned long address, pte_t *ptep)

Yes please.

> I would prefer we introduce something like update_mmu_cache_huge_page(vma,
> address, pmd) and leave the classic update_mmu_cache() unchanged.

Why?
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