linux-kernel - Re: [PATCH v3 11/11] RISC-V: provide Kconfig & commandline options to control parsing "riscv,isa"

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Date:   Tue, 4 Jul 2023 08:12:49 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     <palmer@...belt.com>
CC:     <conor@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>,
        Andrew Jones <ajones@...tanamicro.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Evan Green <evan@...osinc.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        <linux-doc@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: [PATCH v3 11/11] RISC-V: provide Kconfig & commandline options
 to control parsing "riscv,isa"

On Mon, Jul 03, 2023 at 11:28:03AM +0100, Conor Dooley wrote:
> As it says on the tin, provide Kconfig option to control parsing the
> "riscv,isa" devicetree property. If either option is used, the kernel
> will fall back to parsing "riscv,isa", where "riscv,isa-base" and
> "riscv,isa-extensions" are not present.
> The Kconfig options are set up so that the default kernel configuration
> will enable the fallback path, without needing the commandline option.
> 
> Suggested-by: Andrew Jones <ajones@...tanamicro.com>
> Suggested-by: Palmer Dabbelt <palmer@...osinc.com>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> Changes in v3:
> - Invert the Kconfig entry. It's now default y & not hidden by
>   NONPORTABLE, but its entablement will now activate the fallback
> - Add a commandline option to enable the fallback on kernels that do not
>   enable it in Kconfig, as Drew suggested
> - Default the global var to the Kconfig option & override it with the
>   commandline one, rather than have checks for IS_ENABLED() and for the
>   commandline option in riscv_fill_hwcap() &
>   riscv_early_of_processor_hartid()

My own bot reports a build failure for nommu, because of section
mismatches. riscv_early_of_processor_hartid() needs a dose of __init:

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 1acf3679600d..208f1a700121 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -41,7 +41,7 @@ int riscv_of_processor_hartid(struct device_node *node, unsigned long *hart)
 	return 0;
 }
 
-int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hart)
+int __init riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hart)
 {
 	const char *isa;
 
Good aul nommu build, always the one that catches stuff :)

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