linux-kernel - Re: [PATCH] x86: Fix adjust_range_size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 28 May 2013 19:14:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Fix adjust_range_size_mask calling position

On 05/28/2013 04:43 PM, Yinghai Lu wrote:
>>
>> Sorry, I'm not sure I understand what the above paragraph is trying to say.
> 
> We merge the continuous range with same page size allow too early.
> in the case
>      [mem 0x00200000-0x3fffffff] page 2M
>      [mem 0x40000000-0x7bffffff] page 2M
> after merging them, will get
>      [mem 0x00200000-0x7bffffff] page 2M
> even we can use 1G page to map
>      [mem 0x40000000-0x7bffffff]
> 
> that will cause problem, because we map
>      [mem 0x7fe00000-0x7fffffff] page 1G
>      [mem 0x7c000000-0x7fdfffff] page 1G
> with 1G page.
> 
> so need to adjust page size at first before merge
>      [mem 0x00200000-0x3fffffff] page 2M
>      [mem 0x40000000-0x7bffffff] page 2M
> 

What I meant with that is please update the description so someone
uninitiated can follow the description, either now or in 5-10 years.

	-hpa


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/