linux-kernel - Re: [PATCH v3 2/2] RISC-V: separate Zbb optimisations requiring and not requiring toolchain support

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Date: Tue, 28 May 2024 15:35:38 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Conor Dooley <conor@...nel.org>
Cc: linux-riscv@...ts.infradead.org, 
	Conor Dooley <conor.dooley@...rochip.com>, xiao.w.wang@...el.com, pulehui@...wei.com, 
	Charlie Jenkins <charlie@...osinc.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, linux-kernel@...r.kernel.org, 
	Samuel Holland <samuel.holland@...ive.com>, Pu Lehui <pulehui@...weicloud.com>, 
	Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH v3 2/2] RISC-V: separate Zbb optimisations requiring and
 not requiring toolchain support

On Tue, May 28, 2024 at 12:11:12PM GMT, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> It seems a bit ridiculous to require toolchain support for BPF to
> assemble Zbb instructions, so move the dependency on toolchain support
> for Zbb optimisations out of the Kconfig option and to the callsites.
> 
> Zbb support has always depended on alternatives, so while adjusting the
> config options guarding optimisations, remove any checks for
> whether or not alternatives are enabled.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> v2/v3:
> - Per Drew's suggestion, drop the stub Kconfig option and instead push
>   out the toolchain dependency to the relevant callsites.
> - Delete a bunch of comments about only attempting Zbb if alternatives
>   are available, since they always are.
> ---
>  arch/riscv/Kconfig                    |  4 ++--
>  arch/riscv/include/asm/arch_hweight.h |  6 +++---
>  arch/riscv/include/asm/bitops.h       |  4 ++--
>  arch/riscv/include/asm/checksum.h     |  3 +--
>  arch/riscv/lib/csum.c                 | 21 +++------------------
>  arch/riscv/lib/strcmp.S               |  5 +++--
>  arch/riscv/lib/strlen.S               |  5 +++--
>  arch/riscv/lib/strncmp.S              |  5 +++--
>  8 files changed, 20 insertions(+), 33 deletions(-)


Reviewed-by: Andrew Jones <ajones@...tanamicro.com>