Re: in_suspend and __nosave

[Pavel Machek <pavel@ucw.cz>]

Hi!

> While unifying vmlinux.lds for x86 I stumbled
> over the .data.nosave section.
> 
> Searching a bit I found only a single user:
> 
> swsusp.c:int in_suspend __nosavedata = 0;
> 
> Do we really needs all this complexity for this single integer?
> We have this section defined in several arch lds files.

Well, original idea was that drivers may need some memory that's not
affected by hibernation/restore....

> It also occur to me that only: x86, powerpc, and sh
> implement pfn_is_nosave() which I think is the only
> place where we decide if we want to save a page or not.
> 
> But we define the .data.nosave section in following
> architectures:
> arm, m32r, mips, mn10300, parisc, s390 in addition
> to the above archs that define pfn_is_nosave().
> Is this something to be cleaned up?

I guess people were just too happy with cut&paste. Ouch and someone
was working on arm hibernation, iIRC. 

-- 
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