linux-kernel - Re: [PATCH] Revert "memory-hotplug: add 0x prefix to HEX block_size

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Message-ID: <20100409014244.GB5644@localhost>
Date:	Fri, 9 Apr 2010 09:42:44 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>, Greg KH <greg@...ah.com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: [PATCH] Revert "memory-hotplug: add 0x prefix to HEX
	block_size_bytes"

Hi Heiko,

On Fri, Apr 09, 2010 at 05:29:18AM +0800, Heiko Carstens wrote:
> On Thu, Apr 08, 2010 at 11:41:24PM +0800, Américo Wang wrote:
> > On Thu, Apr 08, 2010 at 05:10:06PM +0200, Heiko Carstens wrote:
> > >From: Heiko Carstens <heiko.carstens@...ibm.com>
> > >
> > >Revert ba168fc37dea145deeb8fa9e7e71c748d2e00d74 "memory-hotplug: add 0x prefix
> > >to HEX block_size_bytes" since it changes the user space visible sysfs interface
> > >/sys/devices/system/memory/block_size_bytes.
> > >The change breaks existing user space applications which rely on the fact that
> > >the output does not contain the "0x" prefix.
> > 
> > Odd.
> > 
> > Which application relies on this? Isn't the application which should
> > be fixed?? It should use something like strtoul() which doesn't
> > rely on '0x' prefix.
> 
> Ok, consider it the other way round: your application is doing strtoul()
> with a base of 0 (since you rely on the 0x prefix) and for no good reason
> it doesn't work on older kernels.
> I really can't see a reason for adding additional pitfalls by _changing_
> a long existing user space interface.

Ack to revert it. Sorry for killing your time! 

Thanks,
Fengguang
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