linux-kernel - Re: [PATCH] riscv: Fix toolchain vector detection

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Message-ID: <20240819-unbiased-feast-846ab1347aaf@spud>
Date: Mon, 19 Aug 2024 17:45:04 +0100
From: Conor Dooley <conor@...nel.org>
To: Anton Blanchard <antonb@...storrent.com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH] riscv: Fix toolchain vector detection

On Mon, Aug 19, 2024 at 12:11:31AM +0000, Anton Blanchard wrote:
> A recent change to gcc flags rv64iv as no longer valid:
> 
>    cc1: sorry, unimplemented: Currently the 'V' implementation
>    requires the 'M' extension
> 
> and as a result vector support is disabled. Fix this by adding m
> to our toolchain vector detection code.
> 
> Signed-off-by: Anton Blanchard <antonb@...storrent.com>

This one definitely needs a cc: stable, it's required as far back as
6.6, right?

> ---
>  arch/riscv/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 0f3cd7c3a436..939ea7f6a228 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -552,8 +552,8 @@ config RISCV_ISA_SVPBMT
>  config TOOLCHAIN_HAS_V
>  	bool
>  	default y
> -	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64iv)
> -	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32iv)
> +	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
> +	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)
>  	depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
>  	depends on AS_HAS_OPTION_ARCH
>  
> -- 
> 2.34.1
> 
> 

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