linux-kernel - Re: [RFC][PATCH 12/13] stop

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Message-ID: <20150624084248.GA27873@gmail.com>
Date:	Wed, 24 Jun 2015 10:42:48 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>, tj@...nel.org,
	mingo@...hat.com, linux-kernel@...r.kernel.org, der.herr@...r.at,
	dave@...olabs.net, riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 12/13] stop_machine: Remove lglock


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Jun 23, 2015 at 11:26:26AM -0700, Paul E. McKenney wrote:
> > >
> > > I really think you're making that expedited nonsense far too accessible.
> > 
> > This has nothing to do with accessibility and everything to do with 
> > robustness.  And with me not becoming the triage center for too many non-RCU 
> > bugs.
> 
> But by making it so you're rewarding abuse instead of flagging it :-(

Btw., being a 'triage center' is the bane of APIs that are overly successful,
so we should take that burden with pride! :-)

Lockdep (and the scheduler APIs as well) frequently got into such situations as 
well, and we mostly solved it by being more informative with debug splats.

I don't think a kernel API should (ever!) stay artificially silent, just for fear 
of flagging too many problems in other code.

Thanks,

	Ingo
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