linux-kernel - Re: [Xen-devel] [PATCH 05/13] xen: simplify xen_set_identity_and

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Date:	Tue, 24 Feb 2015 07:15:00 +0100
From:	Juergen Gross <jgross@...e.com>
To:	David Vrabel <dvrabel@...tab.net>, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, konrad.wilk@...cle.com,
	david.vrabel@...rix.com, boris.ostrovsky@...cle.com
Subject: Re: [Xen-devel] [PATCH 05/13] xen: simplify xen_set_identity_and_remap()
 by using global variables

On 02/19/2015 07:10 PM, David Vrabel wrote:
>
>
> On 18/02/2015 06:51, Juergen Gross wrote:
>> xen_set_identity_and_remap() is used to prepare remapping of memory
>> conflicting with the E820 map. It is tracking the pfn where to remap
>> new memory via a local variable which is passed to a subfunction
>> which in turn returns the new value for that variable.
>>
>> Additionally the targeted maximum pfn is passed as a parameter to
>> sub functions.
>>
>> Simplify that construct by using just global variables in the
>> source for that purpose. This will make things simpler when we need
>> those values later, too.
>
> I'm not convinced this actually simplifies anything.

Perhaps I should have emphasised the last sentence a bit more. I really
need the global variables when deferring the remap operation.

Juergen

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