Re: [PATCH] RISC-V: fix check for zvkb with tip-of-tree clang

[Conor Dooley <conor@kernel.org>]

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On Sat, Jan 27, 2024 at 01:00:54AM -0800, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> LLVM commit 8e01042da9d3 ("[RISCV] Add missing dependency check for Zvkb
> (#79467)") broke the check used by the TOOLCHAIN_HAS_VECTOR_CRYPTO
> kconfig symbol because it made zvkb start depending on v or zve*.  Fix
> this by specifying both v and zvkb when checking for support for zvkb.

Seems like a reasonable change on the part of LLVM.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Cheers,
Conor.

> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>
> ---
>  arch/riscv/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index b49016bb5077b..912fff31492b9 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -581,21 +581,21 @@ config TOOLCHAIN_HAS_ZBB
>  	default y
>  	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
>  	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
>  	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
>  	depends on AS_HAS_OPTION_ARCH
>  
>  # This symbol indicates that the toolchain supports all v1.0 vector crypto
>  # extensions, including Zvk*, Zvbb, and Zvbc.  LLVM added all of these at once.
>  # binutils added all except Zvkb, then added Zvkb.  So we just check for Zvkb.
>  config TOOLCHAIN_HAS_VECTOR_CRYPTO
> -	def_bool $(as-instr, .option arch$(comma) +zvkb)
> +	def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
>  	depends on AS_HAS_OPTION_ARCH
>  
>  config RISCV_ISA_ZBB
>  	bool "Zbb extension support for bit manipulation instructions"
>  	depends on TOOLCHAIN_HAS_ZBB
>  	depends on MMU
>  	depends on RISCV_ALTERNATIVE
>  	default y
>  	help
>  	   Adds support to dynamically detect the presence of the ZBB
> 
> base-commit: cb4ede926134a65bc3bf90ed58dace8451d7e759
> -- 
> 2.43.0
> 
> 
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