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[31.30.173.78]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a5a17b17d10sm974132366b.198.2024.05.16.05.38.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 May 2024 05:38:29 -0700 (PDT) Date: Thu, 16 May 2024 14:38:28 +0200 From: Andrew Jones To: Xiao Wang Cc: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, luke.r.nels@gmail.com, xi.wang@gmail.com, bjorn@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, pulehui@huawei.com, haicheng.li@intel.com, conor@kernel.org, ben.dooks@codethink.co.uk Subject: Re: [PATCH v3] riscv, bpf: Optimize zextw insn with Zba extension Message-ID: <20240516-0ec6ff4ad0e23302003be51a@orel> References: <20240516090430.493122-1-xiao.w.wang@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240516090430.493122-1-xiao.w.wang@intel.com> On Thu, May 16, 2024 at 05:04:30PM GMT, Xiao Wang wrote: > The Zba extension provides add.uw insn which can be used to implement > zext.w with rs2 set as ZERO. > > Signed-off-by: Xiao Wang > --- > v3: > * Remove the Kconfig dependencies on TOOLCHAIN_HAS_ZBA and > RISCV_ALTERNATIVE. (Andrew) > v2: > * Add Zba description in the Kconfig. (Lehui) > * Reword the Kconfig help message to make it clearer. (Conor) > --- > arch/riscv/Kconfig | 12 ++++++++++++ > arch/riscv/net/bpf_jit.h | 18 ++++++++++++++++++ > 2 files changed, 30 insertions(+) > Reviewed-by: Andrew Jones