Re: [dpdk-dev] [PATCH v2 1/3] eal/arm64: add 128-bit atomic compare exchange

["Phil Yang (Arm Technology China)" <Phil.Yang@arm.com>]

> -----Original Message-----
> From: Eads, Gage <gage.eads@intel.com>
> Sent: Monday, June 24, 2019 10:46 PM
> To: Phil Yang (Arm Technology China) <Phil.Yang@arm.com>; dev@dpdk.org
> Cc: thomas@monjalon.net; jerinj@marvell.com; hemant.agrawal@nxp.com;
> Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>; Gavin Hu (Arm
> Technology China) <Gavin.Hu@arm.com>; nd <nd@arm.com>
> Subject: RE: [PATCH v2 1/3] eal/arm64: add 128-bit atomic compare exchange
> 
> Hi Phil,
> 
> > diff --git a/lib/librte_eal/common/include/generic/rte_atomic.h
> > b/lib/librte_eal/common/include/generic/rte_atomic.h
> > index 9958543..7dd1aa4 100644
> > --- a/lib/librte_eal/common/include/generic/rte_atomic.h
> > +++ b/lib/librte_eal/common/include/generic/rte_atomic.h
> > @@ -1081,6 +1081,18 @@ static inline void
> > rte_atomic64_clear(rte_atomic64_t *v)
> >
> >  /*------------------------ 128 bit atomic operations
> > -------------------------*/
> >
> > +/**
> > + * 128-bit integer structure.
> > + */
> > +RTE_STD_C11
> > +typedef struct {
> > +	RTE_STD_C11
> > +	union {
> > +		uint64_t val[2];
> > +		__extension__ __int128 int128;
> > +	};
> > +} __rte_aligned(16) rte_int128_t;
> > +
> >  #ifdef __DOXYGEN__
> >
> 
Hi Gage,

> This change breaks 32-bit x86 builds*. A couple ways to resolve this are 1)
> with RTE_ARCH_* ifdefs, or 2) keep duplicate definitions of the struct in the
> aarch64 and x86 header files.
OK. Let's follow the first approach. I will update it in the new version. Thanks!

> 
> Thanks,
> Gage
> 
> *http://mails.dpdk.org/archives/test-report/2019-June/086586.html

Thanks,
Phil