linux-kernel - Re: [PATCH 18/22] mm: mark DEVICE

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Message-ID: <20190620192648.GI12083@dhcp22.suse.cz>
Date:   Thu, 20 Jun 2019 21:26:48 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-nvdimm@...ts.01.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/22] mm: mark DEVICE_PUBLIC as broken

On Thu 13-06-19 11:43:21, Christoph Hellwig wrote:
> The code hasn't been used since it was added to the tree, and doesn't
> appear to actually be usable.  Mark it as BROKEN until either a user
> comes along or we finally give up on it.

I would go even further and simply remove all the DEVICE_PUBLIC code.

> Signed-off-by: Christoph Hellwig <hch@....de>

Anyway
Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 0d2ba7e1f43e..406fa45e9ecc 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -721,6 +721,7 @@ config DEVICE_PRIVATE
>  config DEVICE_PUBLIC
>  	bool "Addressable device memory (like GPU memory)"
>  	depends on ARCH_HAS_HMM
> +	depends on BROKEN
>  	select HMM
>  	select DEV_PAGEMAP_OPS
>  
> -- 
> 2.20.1

-- 
Michal Hocko
SUSE Labs