Subject: Re: [RFC PATCH 14/19] powerpc: allow ioremap within reserved fake ram regions

From: Albert Herranz <[email-masked]>
Date: Thu, 26 Nov 2009 16:35:18 +0100

Benjamin Herrenschmidt wrote:
> On Tue, 2009-11-24 at 18:09 +0100, Albert Herranz wrote:
>> I could use ppc_md.ioremap to duplicate ioremap except for the ioremap
>> ram check.
>> But calling the stock ioremap without modifying it is not possible
>> because it checks and bails out when ioremapping a region marked as
>> ram (even if it's not real ram and it's memreserved).
>>
>> Is the list of memreserved areas preserved once the kernel is running?
>> If it is preserved another option would be to unban ioremapping ram if
>> memreserved.
> 
> Yes, check lmb's they should still be around.
> 

Good.
So adding a kconfig option to allow ioremapping memreserved memory marked as ram and adding a proper check (under that kconfig) to unban this case in ioremap would be an acceptable solution?

> Cheers,
> Ben.

Thanks,
Albert