linux-kernel - Re: [PATCH v12 15/18] xen/pvh: Piggyback on PVHVM for grant driver (v2)

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Date:	Fri, 3 Jan 2014 15:41:51 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <stefano.stabellini@...citrix.com>,
	<mukesh.rathor@...cle.com>
Subject: Re: [PATCH v12 15/18] xen/pvh: Piggyback on PVHVM for grant driver
 (v2)

On 03/01/14 14:44, Konrad Rzeszutek Wilk wrote:
> On Fri, Jan 03, 2014 at 11:54:13AM +0000, David Vrabel wrote:
>> On 02/01/14 18:50, Konrad Rzeszutek Wilk wrote:
>>> On Thu, Jan 02, 2014 at 04:32:03PM +0000, David Vrabel wrote:
>>>> On 01/01/14 04:35, Konrad Rzeszutek Wilk wrote:
>>>>> @@ -1320,4 +1323,4 @@ static int __gnttab_init(void)
>>>>>  	return gnttab_init();
>>>>>  }
>>>>>  
>>>>> -core_initcall(__gnttab_init);
>>>>> +core_initcall_sync(__gnttab_init);
>>>>
>>>> Why has this become _sync?
>>>
>>> It needs to run _after_ the xen_pvh_gnttab_setup has run (which is
>>> at gnttab_init):
>>
>>
>> The use of core_initcall_sync() doesn't imply any ordering to me.  Can't
> 
> It has a clear ordering property.

This really isn't obvious to me.  Can you point to the docs/code the
guarantee this?  I couldn't find it.

>> you call xen_pvh_gnttab_setup() from within __gnttab_init() ?
> 
> No. That is due to the fact that __gnttab_init() is in drivers/xen and is
> also used by the ARM code.
> 
> Stefano in his previous review mentioned he would like PVH specific
> code in arch/x86:
> 
> https://lkml.org/lkml/2013/12/18/507

Call it xen_arch_gnttab_setup() and add weak stub for other architectures?

David
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