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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Cunming Liang <cunming.liang@intel.com>
Date: Mon, 20 Jul 2015 01:39:45 +0200
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Cc: dev@dpdk.org, shemming@brocade.com
Subject: Re: [dpdk-dev] [PATCH v14 06/13] eal/linux: standalone intr event
	fd create support
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2015-07-20 01:35, Thomas Monjalon:
> 2015-07-17 14:16, Cunming Liang:
> > +#ifdef RTE_NEXT_ABI
> > +extern int
> > +rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd);
> > +#else
> > +static inline int
> > +rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
> > +{
> > +	RTE_SET_USED(intr_handle);
> > +	RTE_SET_USED(nb_efd);
> > +	return 0;
> > +}
> > +#endif
> [...]
> > +#ifdef RTE_NEXT_ABI
> > +extern void
> > +rte_intr_efd_disable(struct rte_intr_handle *intr_handle);
> > +#else
> > +static inline void
> > +rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
> > +{
> > +	RTE_SET_USED(intr_handle);
> > +}
> > +#endif
> [...]
> > +#ifdef RTE_NEXT_ABI
> > +static inline int
> > +rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
> > +{
> > +	return !(!intr_handle->nb_efd);
> > +}
> > +#else
> > +static inline int
> > +rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
> > +{
> > +	RTE_SET_USED(intr_handle);
> > +	return 0;
> > +}
> > +#endif
> [...]
> > +#ifdef RTE_NEXT_ABI
> > +static inline int
> > +rte_intr_allow_others(struct rte_intr_handle *intr_handle)
> > +{
> > +	return !!(intr_handle->max_intr - intr_handle->nb_efd);
> > +}
> > +#else
> > +static inline int
> > +rte_intr_allow_others(struct rte_intr_handle *intr_handle)
> > +{
> > +	RTE_SET_USED(intr_handle);
> > +	return 1;
> > +}
> > +#endif
> 
> Why these #else cases?

Why not totally removing these ifdef in the header and use them in .c?

> > --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
> > +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
> > @@ -117,6 +117,10 @@ DPDK_2.1 {
> >  
> >  	rte_epoll_ctl;
> >  	rte_epoll_wait;
> > +	rte_intr_allow_others;
> > +	rte_intr_dp_is_en;
> > +	rte_intr_efd_enable;
> > +	rte_intr_efd_disable;
> 
> If RTE_NEXT_ABI is disabled, these symbols do not exist.
> An alternate .map would be needed.