linux-kernel - Re: local64_cmpxchg() in arc_perf_event

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Message-ID: <20151117122540.GL11639@twins.programming.kicks-ass.net>
Date:	Tue, 17 Nov 2015 13:25:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	arcml <linux-snps-arc@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: local64_cmpxchg() in arc_perf_event_update()

On Tue, Nov 17, 2015 at 01:24:01PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2015 at 04:53:04PM +0530, Vineet Gupta wrote:
> > That means Alexey need to revert the hunk ?
> 
> Yes, I think so.

This is assuming you now have these NMIs we talked about earlier. If all
you have are regular IRQs this is not possible, for we should be calling
->read() with IRQs disabled.
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