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Tue, 04 Mar 2025 09:55:56 -0800 (PST) Received: from [192.168.0.235] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-223504c5c67sm98574735ad.135.2025.03.04.09.55.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 09:55:56 -0800 (PST) Message-ID: Subject: Re: [PATCH bpf-next v2 3/5] bpf: simple DFA-based live registers analysis From: Eduard Zingerman To: Alexei Starovoitov Cc: bpf , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Martin KaFai Lau , Kernel Team , Yonghong Song , Tejun Heo Date: Tue, 04 Mar 2025 09:55:52 -0800 In-Reply-To: References: <20250304074239.2328752-1-eddyz87@gmail.com> <20250304074239.2328752-4-eddyz87@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-03-04 at 09:00 -0800, Alexei Starovoitov wrote: > On Mon, Mar 3, 2025 at 11:43=E2=80=AFPM Eduard Zingerman wrote: > >=20 > > + case BPF_STX: > > + switch (mode) { > > + case BPF_MEM: > > + def =3D 0; > > + use =3D dst | src; > > + break; > > + case BPF_ATOMIC: > > + use =3D dst | src; > > + if (insn->imm & BPF_FETCH) { > > + if (insn->imm =3D=3D BPF_CMPXCHG) > > + def =3D r0; > > + else > > + def =3D src; > > + } else { > > + def =3D 0; > > + } > > + break; > > + } >=20 > This would need a follow up to recognize newly introduced > load_acq/store_rel insns. Missed that load_acq landed. Will send v3 shortly.