linux-kernel - Re: [PATCH v6 04/15] memory-hotplug: remove /sys/firmware/memmap/X sysfs

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Message-Id: <20130109144905.8993886a.akpm@linux-foundation.org>
Date:	Wed, 9 Jan 2013 14:49:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	rientjes@...gle.com, len.brown@...el.com, benh@...nel.crashing.org,
	paulus@...ba.org, cl@...ux.com, minchan.kim@...il.com,
	kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	wujianguo@...wei.com, wency@...fujitsu.com, hpa@...or.com,
	linfeng@...fujitsu.com, laijs@...fujitsu.com, mgorman@...e.de,
	yinghai@...nel.org, glommer@...allels.com, x86@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-ia64@...r.kernel.org, cmetcalf@...era.com,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH v6 04/15] memory-hotplug: remove /sys/firmware/memmap/X
 sysfs

On Wed, 9 Jan 2013 17:32:28 +0800
Tang Chen <tangchen@...fujitsu.com> wrote:

> When (hot)adding memory into system, /sys/firmware/memmap/X/{end, start, type}
> sysfs files are created. But there is no code to remove these files. The patch
> implements the function to remove them.
> 
> Note: The code does not free firmware_map_entry which is allocated by bootmem.
>       So the patch makes memory leak. But I think the memory leak size is
>       very samll. And it does not affect the system.

Well that's bad.  Can we remember the address of that memory and then
reuse the storage if/when the memory is re-added?  That at least puts an upper
bound on the leak.

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