[linux-pm] [RFC PATCH v4] ARM hibernation/suspend-to-disk support

[frank.hofmann@tomtom.com (Frank Hofmann)]

On Thu, 9 Jun 2011, Santosh Shilimkar wrote:

> On 6/9/2011 9:56 PM, Frank Hofmann wrote:
>> 
>> 
[ ... ]
>> a) What reasons if any are there why cpu_{v7_do_}suspend/resume are not
>> ok to use (on OMAP) for snapshotting core state, for the purpose of
>> hibernation ?
>> If there are any such issues, then how could they be addresssed ?
>> 
> Part of the answer is what Russell described. We think it's doable,
> but it needs some work. First and fore most is this code should
> be able to be executed from DDR. It's not the case today.

Ah, I gather that's the _real_ critical point, i.e.

 	_omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
 					omap34xx_cpu_suspend_sz);

relies on this to be completely consecutive in mem, and relocatable, i.e. 
calling _outside_ that area isn't possible ?

I.e. unless a way can be found to _embed_ cpu_suspend/resume here, it's 
pretty hard to use ?

Would it be possible / acceptable to have it be relocatable code, and put 
it into a common .section ?


Thanks for the feedback,
FrankH.