linux-kernel - Re: [PATCH] unbreak alpha percpu

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Message-ID: <20090410170507.GR26366@ZenIV.linux.org.uk>
Date:	Fri, 10 Apr 2009 18:05:07 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	Mike Travis <travis@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] unbreak alpha percpu

On Fri, Apr 10, 2009 at 05:50:30PM +0100, Al Viro wrote:
> On Fri, Apr 10, 2009 at 09:21:08AM -0700, Linus Torvalds wrote:
> > 
> > Hmm. I certainly personally _much_ prefer this version.
> > 
> > It looks like this actually simplifies things for S390 too (no more 
> > simple_identifier_##var games), and generally just looks better. And 
> > seeing that the S390 special case is no longer S390-specific is also a 
> > good sign, imho.
> 
> simple_identifier_##var has been debris from back when Ingo forced
> s390 to use asm-generic/percpu.h; if you look at it, you'll see that
> a) it hadn't worked (look at the argument list carefully) and
> b) get_cpu_var() has the working version anyway
> 
> Less obvious part is that if it actually *would* work, we'd be screwed -
> unlike get_cpu_var() this sucker is called for things that are not
> simple variables; didn't happen for alpha, but did for s390.
> 
> IOW, that's just an old piece of junk that got removed now.

Fsck...  It breaks per_cpu_ptr() :-/  OK, back to square one, then...
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