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

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Message-ID: <87twct1mxa.fsf@vitty.brq.redhat.com>
Date:   Mon, 03 Oct 2016 17:18:09 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.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

Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> writes:

> 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 .
>

Yes, of course)

>> can itself be disabled so it makes sense to make it possible to disable
>
> During boot-time with arguments.

I see, I rather meant we need a way to disable building the module, not
just loading it.

>> 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.

Ok, if you say so)

>> 
>> 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

-- 
  Vitaly