Re: [dpdk-dev] [PATCH 0/3] add lock-free stack support discovery

["Stanisław Kardach" <kda@semihalf.com>]

On Fri, Apr 16, 2021 at 08:34:29AM +0200, David Marchand wrote:
> On Mon, Apr 12, 2021 at 10:29 AM Stanislaw Kardach <kda@semihalf.com> wrote:
> >
> > The lock-free stack implementation (RTE_STACK_F_LF) is supported only on a
> > subset of platforms, namely x86_64 and arm64. Platforms supporting 128b atomics
> > have to opt-in to a generic or C11 implementations. All other platforms use a
> > stubbed implementation for push/pop operations which are basically NOPs.
> > However rte_stack_create() will not fail and application can proceed assuming
> > it has a working lock-free stack.
>
> Did you actually hit this issue or is this only theoretical?
> I can only think of ppc64 displaying such behavior.
>
I actually hit this issue while working on a RISC-V port.
My reasoning here is that sooner or later someone else will stumble upon
this, either on ppc64 or while trying to port to some new platform.
It is also a really nasty limitation do debug given the silent nature of
the failure.

>
> --
> David Marchand
>

--
Best Regards,
Stanislaw Kardach