linux-kernel - Re: [RFC v4 09/17] powerpc: call the hash functions with the correct pkey value

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Date:   Tue, 27 Jun 2017 20:54:07 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        khandual@...ux.vnet.ibm.com, bsingharora@...il.com,
        dave.hansen@...el.com, hbabu@...ibm.com, arnd@...db.de,
        akpm@...ux-foundation.org, corbet@....net, mingo@...hat.com
Subject: Re: [RFC v4 09/17] powerpc: call the hash functions with the correct
 pkey value



On Tuesday 27 June 2017 03:41 PM, Ram Pai wrote:
> Pass the correct protection key value to the hash functions on
> page fault.
> 
> Signed-off-by: Ram Pai <linuxram@...ibm.com>
> ---
>   arch/powerpc/include/asm/pkeys.h | 11 +++++++++++
>   arch/powerpc/mm/hash_utils_64.c  |  4 ++++
>   arch/powerpc/mm/mem.c            |  6 ++++++
>   3 files changed, 21 insertions(+)
> 
> diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
> index ef1c601..1370b3f 100644
> --- a/arch/powerpc/include/asm/pkeys.h
> +++ b/arch/powerpc/include/asm/pkeys.h
> @@ -74,6 +74,17 @@ static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
>   }
> 
>   /*
> + * return the protection key of the vma corresponding to the
> + * given effective address @ea.
> + */
> +static inline int mm_pkey(struct mm_struct *mm, unsigned long ea)
> +{
> +	struct vm_area_struct *vma = find_vma(mm, ea);
> +	int pkey = vma ? vma_pkey(vma) : 0;
> +	return pkey;
> +}
> +
> +/*
>

That is not going to work in hash fault path right ? We can't do a 
find_vma there without holding the mmap_sem

-aneesh