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From: Michael Ellerman <mpe@ellerman.id.au>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, linux-mm@kvack.org,
 akpm@linux-foundation.org
Subject: Re: [PATCH v4 8/9] mm/mremap: Allow arch runtime override
In-Reply-To: <20210414085915.301189-9-aneesh.kumar@linux.ibm.com>
References: <20210414085915.301189-1-aneesh.kumar@linux.ibm.com>
 <20210414085915.301189-9-aneesh.kumar@linux.ibm.com>
Date: Tue, 20 Apr 2021 13:52:09 +1000
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Cc: joel@joelfernandes.org, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
 linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com, kaleshsingh@google.com
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Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes:
> Architectures like ppc64 support faster mremap only with radix
> translation. Hence allow a runtime check w.r.t support for fast mremap.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> ---
>  arch/powerpc/include/asm/tlb.h |  6 ++++++
>  mm/mremap.c                    | 15 ++++++++++++++-
>  2 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
> index 160422a439aa..058918a7cd3c 100644
> --- a/arch/powerpc/include/asm/tlb.h
> +++ b/arch/powerpc/include/asm/tlb.h
> @@ -83,5 +83,11 @@ static inline int mm_is_thread_local(struct mm_struct *mm)
>  }
>  #endif
>  
> +#define arch_supports_page_tables_move arch_supports_page_tables_move
> +static inline bool arch_supports_page_tables_move(void)
> +{
> +	return radix_enabled();
> +}

Not sure it's worth a respin on its own, but page table*s* move is
slightly strange phrasing.

arch_supports_move_page_tables() or arch_supports_page_table_move()
would be more typical.

cheers