linux-kernel - Re: [PATCH v2] Hibernate: check unsafe page should not in e820 reserved region

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Date:	Thu, 7 Aug 2014 11:39:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	joeyli <jlee@...e.com>
Cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Takashi Iwai <tiwai@...e.de>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Hibernate: check unsafe page should not in e820
 reserved region

> > Actually, if you are doing such a check... it makes sense to check for
> > _all_ the regions, nosave or not. If e820 map changed at all, it is
> > not safe to resume.
> > 									Pavel
> 
> Currently nosave region only called register by e820 code, so hibernate's nosave region included e820
> reserved, ACPI data and ACPI NVS region.
> 
> I thought hashing the start/end pfn of above regions is enough.

If ammount of memory changed, for example, it is unsafe to
resume. So if you are doing the check, anyway, please hash
whole e820 table.
						Pavel
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