linux-kernel - Re: [GIT RFC] percpu: use dynamic percpu allocator as the default percpu allocator

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Date:	Sat, 11 Apr 2009 11:08:06 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	x86@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com,
	Paul Mundt <lethal@...ux-sh.org>, rmk@....linux.org.uk,
	starvik@...s.com, ralf@...ux-mips.org, davem@...emloft.net,
	cooloney@...nel.org, kyle@...artin.ca, matthew@....cx,
	grundler@...isc-linux.org, takata@...ux-m32r.org,
	benh@...nel.crashing.org, rth@...ddle.net,
	heiko.carstens@...ibm.com
Subject: Re: [GIT RFC] percpu: use dynamic percpu allocator as the default percpu allocator

On Thu, 9 Apr 2009 09:23:25 pm Tejun Heo wrote:
> It's generally a good idea to use uniquely
> distinguisible identifier for static symbols anyway to help debugging.

Sorry, I can't let this statement stand.  It's completely wrong: use the
shortest clear name, always.

> If this limitation is acceptable, I think we should also add the dup
> build failure thing to the generic definition too tho so that such
> cases can be discovered before they hit alpha and s390 later.
> 
> Any objections?

Yes.  If we decide that static per-cpu is unsupportable, let's not hide the
damn thing.  We just make it give a compile warning if we can, patch out the
current cases, and make checkpatch.pl warn on new ones.

Don't silently override "static".  Don't come up with stupid justifications.
Accept with open-eyes that it's evil, just a lesser evil.

Thanks,
Rusty.
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