linux-kernel - Re: [PATCH] x86: Kill E820_RESERVED

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Date:	Wed, 19 Aug 2015 14:37:03 +0800
From:	Yu Chen <yu.c.chen@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
CC:	linux-kernel@...r.kernel.org, "Lee, Chun-Yi" <jlee@...e.com>,
	Richard L Maliszewski <richard.l.maliszewski@...el.com>,
	Gang Wei <gang.wei@...el.com>,
	Shane Wang <shane.wang@...el.com>,
	tboot-devel@...ts.sourceforge.net, stable@...r.kernel.org,
	Zhang Rui <rui.zhang@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, lenb@...nel.org,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] x86: Kill E820_RESERVED_KERN

Hi,
On 07/29/2015 03:21 AM, Yinghai Lu wrote:
> E820_RESERVED_KERN was introduced to do early allocation for
> setup_data when we were using original early_res with e820 map.
>
> Now we are using memblock to do early resource reserve/allocation, and
> setup_data is reserved in memblock early already.
>
> For kexec path, kexec generate setup_data (Now kexec-tools create SETUP_EFI
> and SETUP_E820_EXT), and pass pointer to second kernel, and
> second kernel reserve setup_data by their own without using e820 map.
>
> So we do not need to touch e820 map at all, and we can kill
> E820_RESERVED_KERN.
>
> That make the code simpler, and at same time that will fix bug with
> hibernation:
>    mark_nonsave_region that can not handle that case:
>      E820_RAM and E820_RESERVED_KERN ranges are continuous and
>      boundary is not page aligned.
>
> Link: https://bugzilla.opensuse.org/show_bug.cgi?id=913885
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=96111

I've tested Hibernation on latest 4.2.-rc7 and encountered panic when
resuming, so I guess this patch has not been merged upstream:

BUG: unable to handle kernel paging request at ffff880085894000
IP: [<ffffffff810c5dc2>] load_image_lzo+0x8c2/0xe70

With current patch and Lee, Chun-Yi's patch applied, the panic
disappeared, would someone please have a look at this patch,
thanks a lot.

Best Regards,
Yu


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