linux-kernel - Re: [PATCH] mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM

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Date:   Wed, 1 May 2019 14:38:51 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ralph Campbell <rcampbell@...dia.com>, linux-mm@...ck.org,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH] mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM_DEVICE
 Kconfig

Andrew just the patch that would be nice to get in 5.2 so i can fix
device driver Kconfig before doing the real update to mm HMM Kconfig

On Wed, Apr 17, 2019 at 05:11:41PM -0400, jglisse@...hat.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> This patch just add 2 new Kconfig that are _not use_ by anyone. I check
> that various make ARCH=somearch allmodconfig do work and do not complain.
> This new Kconfig need to be added first so that device driver that do
> depend on HMM can be updated.
> 
> Once drivers are updated then i can update the HMM Kconfig to depends
> on this new Kconfig in a followup patch.
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Leon Romanovsky <leonro@...lanox.com>
> Cc: Jason Gunthorpe <jgg@...lanox.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> ---
>  mm/Kconfig | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 25c71eb8a7db..daadc9131087 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -676,6 +676,22 @@ config ZONE_DEVICE
>  
>  	  If FS_DAX is enabled, then say Y.
>  
> +config ARCH_HAS_HMM_MIRROR
> +	bool
> +	default y
> +	depends on (X86_64 || PPC64)
> +	depends on MMU && 64BIT
> +
> +config ARCH_HAS_HMM_DEVICE
> +	bool
> +	default y
> +	depends on (X86_64 || PPC64)
> +	depends on MEMORY_HOTPLUG
> +	depends on MEMORY_HOTREMOVE
> +	depends on SPARSEMEM_VMEMMAP
> +	depends on ARCH_HAS_ZONE_DEVICE
> +	select XARRAY_MULTI
> +
>  config ARCH_HAS_HMM
>  	bool
>  	default y
> -- 
> 2.20.1
>