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

From: Andrew Jones <ajones@ventanamicro.com>
To: Conor Dooley <conor@kernel.org>
Cc: linux-riscv@lists.infradead.org,
	"Conor Dooley" <conor.dooley@microchip.com>,
	xiao.w.wang@intel.com, pulehui@huawei.com,
	"Charlie Jenkins" <charlie@rivosinc.com>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	linux-kernel@vger.kernel.org,
	"Samuel Holland" <samuel.holland@sifive.com>,
	"Pu Lehui" <pulehui@huaweicloud.com>,
	"Björn Töpel" <bjorn@kernel.org>
Subject: Re: [PATCH v3 2/2] RISC-V: separate Zbb optimisations requiring and not requiring toolchain support
Date: Tue, 28 May 2024 15:35:38 +0200	[thread overview]
Message-ID: <20240528-4a498a28af8d912561d1a103@orel> (raw)
In-Reply-To: <20240528-opossum-flavorful-3411811b87e2@spud>

On Tue, May 28, 2024 at 12:11:12PM GMT, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@microchip.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@microchip.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@ventanamicro.com>

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