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Message-ID: <6fe2aed9-f29e-4a77-5f47-855cfefe1973@inria.fr>
Date: Mon, 19 May 2025 17:39:52 +0200 (CEST)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Luo Jie <quic_luoj@...cinc.com>
cc: Markus Elfring <Markus.Elfring@....de>, cocci@...ia.fr,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
Catalin Marinas <catalin.marinas@....com>, Joey Gouly <joey.gouly@....com>,
Julia Lawall <Julia.Lawall@...ia.fr>, Marc Zyngier <maz@...nel.org>,
Nicolas Palix <nicolas.palix@...g.fr>,
Oliver Upton <oliver.upton@...ux.dev>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Suzuki Poulouse <suzuki.poulose@....com>, Will Deacon <will@...nel.org>,
Yury Norov <yury.norov@...il.com>, Zenghui Yu <yuzenghui@...wei.com>,
LKML <linux-kernel@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
"Kiran Kumar C.S.K" <quic_kkumarcs@...cinc.com>,
Lei Wei <quic_leiwei@...cinc.com>, Pavithra R <quic_pavir@...cinc.com>,
Suruchi Agarwal <quic_suruchia@...cinc.com>, quic_linchen@...cinc.com
Subject: Re: [cocci] [PATCH v3 2/6] coccinelle: misc: Add field_modify
script
On Mon, 19 May 2025, Luo Jie wrote:
>
>
> On 4/24/2025 12:35 AM, Markus Elfring wrote:
> > …
> > > > -reg &= ~mask;
> > > > -reg |= FIELD_PREP
> > > > + FIELD_MODIFY
> > > > (mask,
> > > > + ®,
> > > > val
> > > > );
> > …
> > > With this code variant, there is no space prior to ®, here is the
> > > example code changes generated by the SmPL code as below, is this
> > > expected?
> > …
> > > +++ b/drivers/phy/starfive/phy-jh7110-dphy-tx.c
> > > @@ -244,8 +244,7 @@ static int stf_dphy_configure(struct phy
> > > i = stf_dphy_get_config_index(bitrate);
> > >
> > > tmp = readl(dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(100));
> > > - tmp &= ~STF_DPHY_REFCLK_IN_SEL;
> > > - tmp |= FIELD_PREP(STF_DPHY_REFCLK_IN_SEL, STF_DPHY_REFCLK_12M);
> > > + FIELD_MODIFY(STF_DPHY_REFCLK_IN_SEL,&tmp, STF_DPHY_REFCLK_12M);
> > > writel(tmp, dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(100));
> >
> > The Coccinelle software is still evolving somehow.
> > Thus your test result can trigger further development considerations.
> > I hope that clarifications and corresponding improvements can be achieved
> > also according to such source code layout concerns.
> >
> > Regards,
> > Markus
>
> OK, understand. I will keep the original patch as below for now, as we
> need to ensure the script generates code with the expected style.
> +- reg &= ~mask;
> +- reg |= FIELD_PREP(mask, val);
> ++ FIELD_MODIFY(mask, ®, val);
>
> In addition, below case is filed to request this improvement on the
> coccinelle project.
> https://github.com/coccinelle/coccinelle/issues/397
Thanks for the report.
julia
>
> Thanks.
>
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