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 17:22:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	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>
Subject: Re: Build failures in -next due to 'locking/atomic, arch/arc:
 Implement atomic_fetch_{add,sub,and,andnot,or,xor}()'



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.