linux-kernel - Re: [PATCH] smp: Remove CSD_FLAG

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Message-ID: <20150227220939.GU5029@twins.programming.kicks-ass.net>
Date:	Fri, 27 Feb 2015 23:09:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Srivatsa S.Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] smp: Remove CSD_FLAG_WAIT flag that's unused

On Fri, Feb 27, 2015 at 12:36:13PM -0800, Tim Chen wrote:
> 
> The CSD_FLAG_WAIT is not serving any useful purpose as we do not use
> its value to decide if we are going to wait for a smp call to complete.
> We also never cleared it properly when we are done waiting to indicate
> that the wait is over.  So the WARNING debug check in csd_unlock is
> also not serving useful purpose.  Propose here to remove it to clean up
> the code.

Linus had a much more comprehensive patch:

  http://marc.info/?l=linux-kernel&m=142368734118230
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