linux-kernel - Re: [PATCH] x86: fix init_memory_mapping for [dc000000

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Date:	Tue, 28 Oct 2008 19:18:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix init_memory_mapping for [dc000000 - e0000000)


* Cyrill Gorcunov <gorcunov@...il.com> wrote:

> [Ingo Molnar - Tue, Oct 28, 2008 at 07:10:04PM +0100]
> | 
> | * Cyrill Gorcunov <gorcunov@...il.com> wrote:
> | 
> | > [Ingo Molnar - Tue, Oct 28, 2008 at 10:27:37AM +0100]
> | > | 
> | > | * Yinghai Lu <yinghai@...nel.org> wrote:
> | > | 
> | > | > Impact: fix range calculation
> | > | 
> | > | applied to tip/x86/urgent, thanks Yinghai!
> | > | 
> | > | i changed the impact line to:
> | > | 
> | > | Impact: change over-mapping to precise mapping, fix /proc/meminfo output
> | > | 
> | > | 	Ingo
> | > | 
> | > 
> | > When we started to use Impact: line? I mean -- now we have
> | > to use it? Just noticed this word in patches a day or maybe
> | > several day ago -- so it seem to be quite freshy :)
> | 
> | We've been experimenting with the impact-line for a couple of 
> | weeks/months, just to see how it works out in practice.
> | 
> | The first impact-line ever was added by hpa in mid-summer:
> | 
> | | commit 908ec7afacfdc83dc10938ed1d3c38b3526034ec
> | | Author: H. Peter Anvin <hpa@...or.com>
> | | Date:   Mon Jun 30 14:42:18 2008 -0700
> | |
> | |    x86: remove arbitrary ELF section limit in i386 relocatable kernel
> | |    
> | |    Impact: build failure in maximal configurations
> | 
> | The concept seems to be quite good in general:
> | 
> |  - increases the readability of the changlogs
> | 
> |  - makes it easier to judge the backporting needs of a commit, even 
> |    if a commit has not been marked as Cc: <stable@...nel.org> straight 
> |    away.
> | 
> |  - makes it easier to notice bugs in a commit: when a commit marked as 
> |    "Impact: cleanup" causes some behavioral change it's clear that 
> |    it's buggy.
> | 
> | It basically acts as a second-level subject line.
> | 
> | So, given these many advantages, we now try to extend the use of 
> | impact-lines to all the tip/*/urgent branches.
> | 
> | It's not a must-have item for patch submissions, just a nice-to-have 
> | property. (we'll add the impact-line when it's missing)
> | 
> | 	Ingo
> | 
> 
> Ingo, I think it's a subject for SubmittingPatches then. To 
> eliminate future possible questions for those who never saw it 
> before. Thanks for explanation!

well, this isnt an official policy in any way and we dont want to 
burden/complicate the life of other maintainers by putting it into 
linux/Documentation/SubmittingPatches. We are still experimenting with 
this concept - and while the results are very encouraging, YMMV!

	Ingo
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