linux-kernel - Re: [RFC, Announce] Unified x86 architecture, arch/x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20070721080143.GF3801@stusta.de>
Date:	Sat, 21 Jul 2007 10:01:43 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Andi Kleen <ak@...e.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [RFC, Announce] Unified x86 architecture, arch/x86

On Sat, Jul 21, 2007 at 09:42:48AM +0200, Andi Kleen wrote:
> On Saturday 21 July 2007 09:35:33 Adrian Bunk wrote:
> 
> > The problem with the current "merging" is that it's extremely hard to 
> > figure out whether some code in x86_64 might be using some code in i386 
> > since there are currently 5 (five) different mechanisms used for sharing 
> > code between the two architectures.
> > 
> > It happens so often that someone accidentally breaks one architecture 
> > because he didn't notice the code also gets used on the other 
> > architecture.
> 
> That's not changing at all. Especially with even more sharing, (than I think
> would be prudent) like Thomas treated, you'll likely have to test compile both
> for most changes.

It's not about compilation, it's about seeing that this code might be 
shared.

When e.g. changing a file under arch/i386/kernel/cpu/mtrr/ it's highly 
surprising that this file might also be used on x86_64.

> -Andi

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/