linux-kernel - Re: Build failures in -next due to 'locking/atomic, arch/arc: Implement atomic_fetch

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Date:	Fri, 17 Jun 2016 17:36:11 +0200
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Noam Camus <noamca@...lanox.com>,
	Guenter Roeck <linux@...ck-us.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<linux-snps-arc@...ts.infradead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Will Deacon" <will.deacon@....com>,
	Gilad Ben Yossef <giladby@...lanox.com>
Subject: Re: Build failures in -next due to 'locking/atomic, arch/arc:
 Implement atomic_fetch_{add,sub,and,andnot,or,xor}()'

On Friday 17 June 2016 05:22 PM, Peter Zijlstra wrote:
> Question; why does atomic_read() have a full memory clobber on arc?
> 
> Will thinks its because you don't use a memory constraint for *v.

So that is only for CONFIG_ARC_PLAT_EZNPS and very liekly not needed. Although NPS
has some design constraints which Noam knows of better !