linux-kernel - Re: [Xen-devel] [PATCH RFC] xen: make it possible to disable XEN

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Date:   Mon, 3 Oct 2016 10:19:14 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        linux-kernel@...r.kernel.org,
        David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH RFC] xen: make it possible to disable XEN_TMEM

On Mon, Oct 03, 2016 at 04:02:48PM +0200, Vitaly Kuznetsov wrote:
> XEN_TMEM config option has no prompt and it is enabled as module by
> default if CLEANCACHE or FRONTSWAP options are set with no way to disable
> it. The only in-tree user of the tmem interface is xen-selfballoon which

And if CONFIG_XEN=y .

> can itself be disabled so it makes sense to make it possible to disable

During boot-time with arguments.
> XEN_TMEM too. In theory, both these options could be unified under the
> XEN_SELFBALLOONING but other (out-of-tree) users of the tmem interface
> may exist and someone may want to keep them supported without enabling
> XEN_SELFBALLOONING.

I think going the route of XEN_SELFBALLOONING may be better.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
> - I don't know much about tmem and its users thus RFC.
> ---
>  drivers/xen/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index f15bb3b7..0ea1df8 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -166,7 +166,7 @@ config SWIOTLB_XEN
>  	select SWIOTLB
>  
>  config XEN_TMEM
> -	tristate
> +	tristate "Transcendent Memory support for Xen"
>  	depends on !ARM && !ARM64
>  	default m if (CLEANCACHE || FRONTSWAP)
>  	help
> -- 
> 2.7.4
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> https://lists.xen.org/xen-devel