Message-ID: <4761A6E7.7030602@zytor.com>
Date: Thu, 13 Dec 2007 13:40:55 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Ingo Molnar <mingo@elte.hu>
CC: Glauber de Oliveira Costa <gcosta@redhat.com>,
       linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
       glommer@gmail.com, tglx@linutronix.de, ehabkost@redhat.com,
       jeremy@goop.org, avi@qumranet.com, anthony@codemonkey.ws,
       virtualization@lists.linux-foundation.org, rusty@rustcorp.com.au,
       ak@suse.de, chrisw@sous-sol.org, rostedt@goodmis.org, zach@vmware.com,
       roland@redhat.com
Subject: Re: [PATCH] avoid ifdefs in desc.h, getting rid of pack_ldt and	pack_tss
References: <11975561713425-git-send-email-gcosta@redhat.com> <20071213202800.GD25130@elte.hu> <20071213205838.GA9649@elte.hu> <20071213212221.GA16747@elte.hu> <4761A385.1080301@zytor.com> <20071213213517.GA25563@elte.hu>
In-Reply-To: <20071213213517.GA25563@elte.hu>
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Ingo Molnar wrote:
>> Well, "no functional changes" is not quite the same thing as "no 
>> object code changes".
> 
> yeah, true, but the safest way to ensure no functional changes is to get 
> identical object code. In sched-devel.git i include obj comparisons to 
> cleanup patches as a self-assurance (and later bughunt helper) to make 
> sure a cleanup is really just a cleanup.

Of course.  "No object code changes" is a stronger statement, however, 
not all types of cleanups result in that.

It's highly useful when applied appropriately, though.  In particular, 
the programmer should know when object code changes are expected.

	-hpa
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