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

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Message-ID: <861b6cf0-c120-212f-43d8-3431551fe871@microchip.com>
Date:   Wed, 7 Sep 2022 16:35:50 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <heiko@...ech.de>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>
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

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?

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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