linux-kernel - Re: [PATCH 1/2] x86 boot: add E820_RESVD

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Message-ID: <86802c440806271505n78275758re235ef6616d95b3d@mail.gmail.com>
Date:	Fri, 27 Jun 2008 15:05:47 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, andi@...stfloor.org,
	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86 boot: add E820_RESVD_KERN

On Thu, Jun 26, 2008 at 7:48 PM, Huang, Ying <ying.huang@...el.com> wrote:
> On Thu, 2008-06-26 at 19:22 -0700, Yinghai Lu wrote:
>> On Thu, Jun 26, 2008 at 2:47 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>> > On Thu, Jun 26, 2008 at 12:48 AM, Huang, Ying <ying.huang@...el.com> wrote:
>> >> On Thu, 2008-06-26 at 00:25 -0700, Yinghai Lu wrote:
>> >> [...]
>> >>> >                if (pfn >= limit_pfn)
>> >>> > @@ -977,7 +978,7 @@ u64 __init early_reserve_e820(u64 startt
>> >>> >                return 0;
>> >>> >
>> >>> >        addr = round_down(start + size - sizet, align);
>> >>> > -       e820_update_range(addr, sizet, E820_RAM, E820_RESERVED);
>> >>> > +       e820_update_range(addr, sizet, E820_RAM, E820_RESVD_KERN);
>> >>>
>> >>> this line is not needed.
>> >>
>> >> Why? Memory reserved by early_rserved_e820 should not be saved during
>> >> hibernation? shoudl not be saved by kdump?
>> >>
>
> Can you tell me why this line is not needed?
>
> [...]
>> some like the attach patch...
>>
>> you still can merge parse_setup_data parse_e820_ext
>> also entries in parse_e820_ext is not initialized..., __copy_e820_map
>> will do nothing.
>
> OK. Because some E820 entries are available after parse_setup_data(),
> it is better to call reserve_setup_data() after calling
> parse_setup_data() if update_e820_range() is used instead of
> reserve_early().

please modify it and test on your platforms then submit to Ingo..

Thanks

YH