Re: [Patch 8/8] kexec: allow to shrink reserved memory

[Amerigo Wang]

KAMEZAWA Hiroyuki wrote:
> On Tue, 18 Aug 2009 14:31:23 +0800
> Amerigo Wang <amwang@xxxxxxxxxx> wrote:
>   
> > >     It's hidden from the system before mem_init() ?
> > >   
> > >       
> > Not sure, but probably yes. It is reserved in setup_arch() which is 
> > before mm_init() which calls mem_init().
> >
> > Do you have any advice to free that reserved memory after boot? :)
> >
> >     
>
> Let's see arch/x86/mm/init.c::free_initmem()
>
> Maybe it's all you want.
>
> 	- ClearPageReserved()
> 	- init_page_count()
> 	- free_page()
> 	- totalram_pages++
>   

Just FYI: calling ClearPageReserved() caused an oops: "Unable to handle 
paging request".

I am trying to figure out why...

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