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

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Date:	Wed, 22 Jun 2016 12:24:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	linux-snps-arc@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Anton Kolesov <Anton.Kolesov@...opsys.com>
Subject: Re: Build failures in -next due to 'locking/atomic, arch/arc:
 Implement atomic_fetch_{add,sub,and,andnot,or,xor}()'

On Wed, Jun 22, 2016 at 03:34:54PM +0530, Vineet Gupta wrote:
> 
> Peter the fixlet below doesn't show up in linux-next yet. Could you please do that
> soon. Our internal build lords are yelling at me :-)
> 
> To keep things bisectable, it would be desirable to squash this with the orig commit !

The fix seems to be in tip/locking/arch-atomic, albeit not squashed.

Ingo?

if you're going to rebase that branch, I have one more fix for
tilepro, so let me know.

> > ---
> >  arch/arc/include/asm/atomic.h | 8 --------
> >  1 file changed, 8 deletions(-)
> > 
> > diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h
> > index bd9c51cb2bfd..4e3c1b6b0806 100644
> > --- a/arch/arc/include/asm/atomic.h
> > +++ b/arch/arc/include/asm/atomic.h
> > @@ -71,7 +71,6 @@ static inline int atomic_##op##_return(int i, atomic_t *v)		\
> >  static inline int atomic_fetch_##op(int i, atomic_t *v)			\
> >  {									\
> >  	unsigned int val, orig;						\
> > -	SCOND_FAIL_RETRY_VAR_DEF                                        \
> >  									\
> >  	/*								\
> >  	 * Explicit full memory barrier needed before/after as		\
> > @@ -84,11 +83,8 @@ static inline int atomic_fetch_##op(int i, atomic_t *v)			\
> >  	"	" #asm_op " %[val], %[orig], %[i]	\n"		\
> >  	"	scond   %[val], [%[ctr]]		\n"		\
> >  	"						\n"		\
> > -	SCOND_FAIL_RETRY_ASM						\
> > -									\
> >  	: [val]	"=&r"	(val),						\
> >  	  [orig] "=&r" (orig)						\
> > -	  SCOND_FAIL_RETRY_VARS						\
> >  	: [ctr]	"r"	(&v->counter),					\
> >  	  [i]	"ir"	(i)						\
> >  	: "cc");							\
> > @@ -199,10 +195,6 @@ ATOMIC_OPS(andnot, &= ~, bic)
> >  ATOMIC_OPS(or, |=, or)
> >  ATOMIC_OPS(xor, ^=, xor)
> >  
> > -#undef SCOND_FAIL_RETRY_VAR_DEF
> > -#undef SCOND_FAIL_RETRY_ASM
> > -#undef SCOND_FAIL_RETRY_VARS
> > -
> >  #else /* CONFIG_ARC_PLAT_EZNPS */
> >  
> >  static inline int atomic_read(const atomic_t *v)