Re: [PATCH 2/2] membarrier: riscv: Provide core serializing command

[Palmer Dabbelt]

On Wed, 06 Dec 2023 06:11:07 PST (-0800), parri.andrea@xxxxxxxxx wrote:
> > I see
> >
> > $ git grep "config MEMBARRIER" fab957c11efe2f405e08b9f0d080524bc2631428
> > fab957c11efe2f405e08b9f0d080524bc2631428:init/Kconfig:config MEMBARRIER
> >
> > so IMO this is just one of those forever bugs.  So I'd lean towards
> >
> >    Fixes: fab957c11efe ("RISC-V: Atomic and Locking Code")
>
> Works for me, will apply in v2.
>
>
> > (or anything in that original patch set).  It's not that big of a backport,
> > so I think it's safe enough?
>
> Indeed, I think so.
>
> The final version of this fix will likely depend on some machinery/code
> introduced by 3ccfebedd8cf54 ("powerpc, membarrier: Skip memory barrier
> in switch_mm()"); but, yes, nothing we can't safely adjust I think.

Ya, I guess we'll have to look to know for sure but hopefully it's 
manageable.

> Thanks,
>   Andrea