linux-kernel - Re: [PATCH V2 2/2] riscv: errata: Add ERRATA_THEAD_WRITE

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Message-ID: <CAJF2gTR9zriPBtOLx5Kt0hFZveL23uHV4W0SvPFLQrzdDU=mkg@mail.gmail.com>
Date: Wed, 15 Oct 2025 15:53:23 +0800
From: Guo Ren <guoren@...nel.org>
To: Paul Walmsley <pjw@...nel.org>
Cc: Han Gao <rabenda.cn@...il.com>, Alexandre Ghiti <alexghiti@...osinc.com>, 
	Alexandre Ghiti <alex@...ti.fr>, palmer@...belt.com, conor@...nel.org, 
	paul.walmsley@...ive.com, bjorn@...osinc.com, eobras@...hat.com, 
	corbet@....net, peterlin@...estech.com, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Leonardo Bras <leobras@...hat.com>
Subject: Re: [PATCH V2 2/2] riscv: errata: Add ERRATA_THEAD_WRITE_ONCE fixup

On Wed, Oct 15, 2025 at 11:37 AM Paul Walmsley <pjw@...nel.org> wrote:
>
> Hello Han Gao, Guo Ren,
>
> Sorry for the delay in responding -
>
> On Tue, Oct 7, 2025 at 11:36 PM Han Gao <rabenda.cn@...il.com> wrote:
>
> >      This patch is included in the 6.17 merge window but not in the
> > 6.18 merge window.
> >      Is it possible that the patch was missed?
>
> This was almost sent upstream as part of the v6.18 merge window, but given
> that it adds the ability for architectures to override WRITE_ONCE, I think
> it needs one more attempt at gathering feedback before we do.  I'll send
> that out this week.
Thanks, Paul, for the effort on this patch. Yes, overriding WRITE_ONCE
needs more public feedback; it makes sense to us. This errata from the
c910 early version causes issues for the community, but some SoCs,
such as th1520 and sg2042, need it to prevent potential risks.


>
> thanks for your patience,
>
> - Paul



--
Best Regards
 Guo Ren