[dpdk-dev] [PATCH v2 14/29] eal/arm64: change barrier definitions to macros

[Jerin Jacob]

On Tue, Jan 03, 2017 at 03:55:45PM +0800, Jianbo Liu wrote:
> On 27 December 2016 at 17:49, Jerin Jacob
> <jerin.jacob at caviumnetworks.com> wrote:
> > Change rte_?wb definitions to macros in order to
> 
> use rte_*mb?

IMHO, regex ? is appropriate here.
https://en.wikipedia.org/wiki/Regular_expression

> 
> > keep consistent with other barrier definitions in
> > the file.
> >
> > Suggested-by: Jianbo Liu <jianbo.liu at linaro.org>
> > Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> > ---
> >  .../common/include/arch/arm/rte_atomic_64.h        | 36 ++--------------------
> >  1 file changed, 3 insertions(+), 33 deletions(-)
> >
> > diff --git a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> > index ef0efc7..dc3a0f3 100644
> > --- a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> > +++ b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> > @@ -46,41 +46,11 @@ extern "C" {
> >  #define dsb(opt)  { asm volatile("dsb " #opt : : : "memory"); }
> >  #define dmb(opt)  { asm volatile("dmb " #opt : : : "memory"); }
> >
> > -/**
> > - * General memory barrier.
> > - *
> > - * Guarantees that the LOAD and STORE operations generated before the
> > - * barrier occur before the LOAD and STORE operations generated after.
> > - * This function is architecture dependent.
> > - */
> > -static inline void rte_mb(void)
> > -{
> > -       dsb(sy);
> > -}
> > +#define rte_mb() dsb(sy)
> >
> > -/**
> > - * Write memory barrier.
> > - *
> > - * Guarantees that the STORE operations generated before the barrier
> > - * occur before the STORE operations generated after.
> > - * This function is architecture dependent.
> > - */
> > -static inline void rte_wmb(void)
> > -{
> > -       dsb(st);
> > -}
> > +#define rte_wmb() dsb(st)
> >
> > -/**
> > - * Read memory barrier.
> > - *
> > - * Guarantees that the LOAD operations generated before the barrier
> > - * occur before the LOAD operations generated after.
> > - * This function is architecture dependent.
> > - */
> 
> How about keep the comments for all these macros?

lib/librte_eal/common/include/generic/rte_atomic.h file has description
for all the barriers.All other arch are doing in the same-way.

> 
> > -static inline void rte_rmb(void)
> > -{
> > -       dsb(ld);
> > -}
> > +#define rte_rmb() dsb(ld)
> >
> >  #define rte_smp_mb() dmb(ish)
> >
> > --
> > 2.5.5
> >