linux-kernel - Re: [PATCH 1/3] x86, hibernate: Fix nosave

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Message-ID: <20180901153853.GA16196@chenyu-desktop>
Date:   Sat, 1 Sep 2018 23:38:54 +0800
From:   Yu Chen <yu.c.chen@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Gu Zhimin <kookoo.gu@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
        x86@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86, hibernate: Fix nosave_regions setup for
 hibernation

Hi,
On Thu, Aug 30, 2018 at 02:45:26PM +0200, Thomas Gleixner wrote:
> On Mon, 27 Aug 2018, Gu Zhimin wrote:
> > 
> > Fix this problem by changing pfn limit from max_low_pfn to max_pfn.
> > This issue should also exist on 64bits systems, if there are reserved
> > regions above 4GB.
> 
> Should? Can we please have facts and not some half baken assumptions? 
> 
> On 64bit max_low_pfn is the same as max_pfn. See init_mem_mapping().
>
Thanks for pointing this out, we've overlooked the reassignment of max_low_pfn,
but just take a glance within setup_arch().
Best,
Yu

> Thanks,
> 
> 	tglx