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: <20120915133833.GA32398@linux-mips.org>
Date:	Sat, 15 Sep 2012 15:38:33 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, akpm@...ux-foundation.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 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)

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

  Ralf
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