[dpdk-dev] [PATCH v6 1/6] lib/eal: implement the family of rte bit operation APIs

[Honnappa Nagarahalli]

<snip>

> 
> On Sat, 21 Dec 2019 16:07:23 +0000
> Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com> wrote:
> 
> > Converting these into macros will help remove the size based duplication of
> APIs. I came up with the following macro:
> >
> > #define RTE_GET_BIT(nr, var, ret, memorder) \ ({ \
> >     if (sizeof(var) == sizeof(uint32_t)) { \
> >         uint32_t mask1 = 1U << (nr)%32; \
> >         ret = __atomic_load_n(&var, (memorder)) & mask1;\
> >     } \
> >     else {\
> >         uint64_t mask2 = 1UL << (nr)%64;\
> >         ret = __atomic_load_n(&var, (memorder)) & mask2;\
> >     } \
> > })
> 
> Macros are more error prone. Especially because this is in exposed header file
That's another question I have. Why do we need to have these APIs in a public header file? These will add to the ABI burden as well. These APIs should be in a common-but-not-public header file. I am also not sure how helpful these APIs are for applications as these APIs seem to have considered requirements only from the PMDs.