linux-kernel - Re: [PATCH] riscv: make t-head erratas depend on MMU

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Date:   Wed, 07 Sep 2022 19:58:51 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, Conor.Dooley@...rochip.com
Cc:     samuel@...lland.org, guoren@...nel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        lkp@...el.com
Subject: Re: [PATCH] riscv: make t-head erratas depend on MMU

Am Mittwoch, 7. September 2022, 18:35:50 CEST schrieb Conor.Dooley@...rochip.com:
> On 07/09/2022 16:49, Heiko Stuebner wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > Both basic extensions of SVPBMT and ZICBOM depend on CONFIG_MMU.
> > Make the T-Head errata implementations of the similar functionality
> > also depend on it to prevent build errors.
> > 
> > Fixes: a35707c3d850 ("riscv: add memory-type errata for T-Head")
> > Fixes: d20ec7529236 ("riscv: implement cache-management errata for T-Head SoCs")
> > Reported-by: kernel test robot <lkp@...el.com>
> 
> In case anyone cares:
> Link: https://lore.kernel.org/all/202209070536.lIefsBuR-lkp@intel.com/
> 
> > Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> > ---
> >  arch/riscv/Kconfig.erratas | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/riscv/Kconfig.erratas b/arch/riscv/Kconfig.erratas
> > index 6850e9389930..f3623df23b5f 100644
> > --- a/arch/riscv/Kconfig.erratas
> > +++ b/arch/riscv/Kconfig.erratas
> > @@ -46,7 +46,7 @@ config ERRATA_THEAD
> > 
> >  config ERRATA_THEAD_PBMT
> >         bool "Apply T-Head memory type errata"
> > -       depends on ERRATA_THEAD && 64BIT
> > +       depends on ERRATA_THEAD && 64BIT && MMU
> >         select RISCV_ALTERNATIVE_EARLY
> >         default y
> >         help
> > @@ -57,7 +57,7 @@ config ERRATA_THEAD_PBMT
> > 
> >  config ERRATA_THEAD_CMO
> >         bool "Apply T-Head cache management errata"
> > -       depends on ERRATA_THEAD
> > +       depends on ERRATA_THEAD && MMU
> 
> "Random" thought/question:
> These two (and the sifive) errata all use oneliner depends
> but the PMU series of yours has:
> config ERRATA_THEAD_PMU
> 	bool "Apply T-Head PMU errata"
> 	depends on ERRATA_THEAD
> 	depends on RISCV_PMU_SBI
> 
> What's the rationale behind not oneliner-ing that one?

probably not thinking too much about it beforehand ;-) .

But yes going with one line is probably nicer, so I transplanted this
comment over to the sbi-pmu patch, for when a v4 might be necessary.

Heiko

> That's obviously orthogonal to this patch though, so:
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> 
> >         select RISCV_DMA_NONCOHERENT
> >         default y
> >         help
> > --
> > 2.35.1
> > 
> > 
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
> 
> 

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