Build failures in -next due to 'locking/atomic, arch/arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}()'

[Peter Zijlstra]

On Fri, Jun 17, 2016 at 07:36:56AM -0700, Guenter Roeck wrote:
> Hi Peter,
> 
> I am seeing build failures in -next when trying to build arc / arcv2 targets.
> 
> arch/arc/include/asm/atomic.h:74:2: error: ‘SCOND_FAIL_RETRY_VAR_DEF’ undeclared
> arch/arc/include/asm/atomic.h:87:2: error: expected ‘:’ or ‘)’ before ‘SCOND_FAIL_RETRY_ASM’
> 
> Problems seem to be caused by 'locking/atomic, arch/arc: Implement
> atomic_fetch_{add,sub,and,andnot,or,xor}()'. Both SCOND_FAIL_RETRY_VAR_DEF and
> SCOND_FAIL_RETRY_ASM are undefined.

Crud, I messed up the rebase against the backoff reverts. Lemme go do
fixups.