linux-kernel - Re: [RFC PATCH] memory driver: make phys_index/end_phys_index reflect the start/end section number

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Message-ID: <533C362E.1020605@intel.com>
Date:	Wed, 02 Apr 2014 09:09:18 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
CC:	nfont@...ux.vnet.ibm.com, gregkh@...uxfoundation.org
Subject: Re: [RFC PATCH] memory driver: make phys_index/end_phys_index reflect
 the start/end section number

On 04/02/2014 01:56 AM, Li Zhong wrote:
> I noticed the phys_index and end_phys_index under 
> /sys/devices/system/memory/memoryXXX/ have the same value, e.g.
> (for the test machine, one memory block has 8 sections, that is 
>  sections_per_block equals 8)
> 
> # cd /sys/devices/system/memory/memory100/
> # cat phys_index end_phys_index 
> 00000064
> 00000064
> 
> Seems they should reflect the start/end section number respectively, which 
> also matches what is said in Documentation/memory-hotplug.txt

This changes a user-visible interface.  Won't this break userspace?
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