[PATCH V11 00/17] riscv: Add Native/Paravirt qspinlock support

[Guo Ren]

On Sun, Sep 10, 2023 at 5:16 PM Guo Ren <guoren at kernel.org> wrote:
>
> On Sun, Sep 10, 2023 at 4:58 PM Conor Dooley <conor at kernel.org> wrote:
> >
> > On Sun, Sep 10, 2023 at 04:28:54AM -0400, guoren at kernel.org wrote:
> >
> > > Changlog:
> > > V11:
> > >  - Based on Leonardo Bras's cmpxchg_small patches v5.
> > >  - Based on Guo Ren's Optimize arch_spin_value_unlocked patch v3.
> > >  - Remove abusing alternative framework and use jump_label instead.
> >
> > btw, I didn't say that using alternatives was the problem, it was
> > abusing the errata framework to perform feature detection that I had
> > a problem with. That's not changed in v11.
> I've removed errata feature detection. The only related patches are:
>  - riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup
>  - riscv: qspinlock: errata: Enable qspinlock for T-HEAD processors
And this one:
 - riscv: Use Zicbop in arch_xchg when available

>
> Which one is your concern? Could you reply on the exact patch thread? Thx.
>
> >
> > A stronger forward progress guarantee is not an erratum, AFAICT.
> Sorry, there is no erratum of "stronger forward progress guarantee" in the V11.
>
> >
> > >  - Introduce prefetch.w to improve T-HEAD processors' LR/SC forward progress
> > >    guarantee.
> > >  - Optimize qspinlock xchg_tail when NR_CPUS >= 16K.
>
>
>
> --
> Best Regards
>  Guo Ren



-- 
Best Regards
 Guo Ren