linux-kernel - Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT

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Message-Id: <20120914072732.637f4225c32565468f468305@canb.auug.org.au>
Date:	Fri, 14 Sep 2012 07:27:32 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Will Deacon <will.deacon@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mhocko@...e.cz, Steve Capper <steve.capper@....com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE

Hi Andrew,

On Thu, 13 Sep 2012 12:05:14 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> diff -puN arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage arch/x86/Kconfig
> --- a/arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage
> +++ a/arch/x86/Kconfig
> @@ -83,7 +83,6 @@ config X86
>  	select IRQ_FORCED_THREADING
>  	select USE_GENERIC_SMP_HELPERS if SMP
>  	select HAVE_BPF_JIT if X86_64
> -	select HAVE_ARCH_TRANSPARENT_HUGEPAGE

Why not
	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if MMU

>  	select CLKEVT_I8253
>  	select ARCH_HAVE_NMI_SAFE_CMPXCHG
>  	select GENERIC_IOMAP
> @@ -1330,6 +1329,10 @@ config ILLEGAL_POINTER_VALUE
>         default 0 if X86_32
>         default 0xdead000000000000 if X86_64
>  
> +config HAVE_ARCH_TRANSPARENT_HUGEPAGE
> +       def_bool y
> +       depends on MMU
> +

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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