linux-kernel - Re: [PATCH] x86: make sure wakeup code is below 1M -v2

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Date:	Thu, 12 Nov 2009 09:17:12 +0800
From:	ykzhao <yakui.zhao@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] x86: make sure wakeup code is below 1M -v2

On Thu, 2009-11-12 at 03:05 +0800, Yinghai Lu wrote:
> ykzhao wrote:
> > On Wed, 2009-11-11 at 10:27 +0800, Yinghai Lu wrote:
> >> try to find_e820_area/reserve_early, and call acpi_reserve_memory early
> >>
> >> to get area is below 1M
> >>
> >> -v2: change function name to acpi_reserve_wakeup_memory according to Rafael
> > It seems that the function of find_e820_area is called in several
> > places.
> >    >Initmem_init: bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT,
> > bootmap_size, PAGE_SIZE);
> >    
> > If we also call it in the acpi_reserve_wakeup_memory, do we get the same
> > base address as that obtained in initmem_init?
> 
> no. find_e820_area will check the reserve res array that could be updated by reserve_early.
It will check the reserved region array when calling the function of
find_e820_area. 
But it seems that the array is not updated when the find_e820_area is
called in the function of initmem_init.

At the same time the  acpi_reserve_bootmem is called after initializing
the boot mem allocator. Can we continue to reserve some region by using
find_e820_area?

thanks.
> 
> YH

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