|From:||Andi Kleen <ak-AT-suse.de>|
|To:||Thomas Gleixner <tglx-AT-linutronix.de>|
|Subject:||Re: [RFC, Announce] Unified x86 architecture, arch/x86|
|Date:||Sat, 21 Jul 2007 07:37:58 +0200|
|Cc:||LKML <linux-kernel-AT-vger.kernel.org>, Linus Torvalds <torvalds-AT-osdl.org>, Andrew Morton <akpm-AT-osdl.org>, Ingo Molnar <mingo-AT-elte.hu>, Arjan van de Ven <arjan-AT-infradead.org>, Chris Wright <chrisw-AT-sous-sol.org>, Steven Rostedt <rostedt-AT-goodmis.org>|
On Saturday 21 July 2007 00:32, Thomas Gleixner wrote: > We are pleased to announce a project we've been working on for some > time: the unified x86 architecture tree, or "arch/x86" - and we'd like > to solicit feedback about it. Well you know my position on this. I think it's a bad idea because it means we can never get rid of any old junk. IMNSHO arch/x86_64 is significantly cleaner and simpler in many ways than arch/i386 and I would like to preserve that. Also in general arch/x86_64 is much easier to hack than arch/i386 because it's easier to regression test and in general has to care about much less junk. And I don't know of any way to ever fix that for i386 besides splitting the old stuff off completely. Besides radical file movements like this are bad anyways. They cause a big break in patchkits and forward/backwards porting that doesn't really help anybody. > This causes double maintenance > even for functionality that is conceptually the same for the 32-bit and > the 64-bit tree. (such as support for standard PC platform architecture > devices) It's not really the same platform: one is PC hardware going back forever with zillions of bugs, the other is modern PC platforms which much less bugs and quirks To see it otherwise it's more a junkification of arch/x86_64 than a cleanup of arch/i386 -- in fact you didn't really clean up arch/i386 at all. > How did we do it? > ----------------- > > As an initial matter, we made it painstakingly sure that the resulting > .o files in a 32-bit build are bit for bit equal. You got not a single line less code duplication then, so i don't really see the point of this. -Andi
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