linux-kernel - Re: local64_cmpxchg() in arc_perf_event

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Message-ID: <564B2A7B.8050707@synopsys.com>
Date:	Tue, 17 Nov 2015 18:54:11 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	arcml <linux-snps-arc@...ts.infradead.org>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: local64_cmpxchg() in arc_perf_event_update()

On Tuesday 17 November 2015 05:55 PM, Peter Zijlstra wrote:
> 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.

Ok then there is not need for this change ATM. I'll queue up the revert in the
branch which brings NMI support !

Thx,
-Vineet
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