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[35.83.186.167]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e1bba0696sm1902898a91.7.2026.09.15.20.45.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Sep 2026 20:45:17 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 16 Sep 2026 03:45:16 +0000 Message-Id: Cc: "Andy Lutomirski" , "Josh Triplett" , "Uladzislau Rezki" , "Mathieu Desnoyers" , "Lai Jiangshan" , "Zqiang" , "Juergen Gross" , "Luis Chamberlain" , "Ihor Solodrai" , , , , , , , "Andy Lutomirski" , "Josh Triplett" , "Uladzislau Rezki" , "Mathieu Desnoyers" , "Lai Jiangshan" , "Zqiang" , "Juergen Gross" , "Luis Chamberlain" , "Ihor Solodrai" , , , , , , Subject: Re: [PATCH RFC v3 06/13] bpf: Take a Tasks Trace reader in the trampoline glue From: "Alexei Starovoitov" To: "Josef Bacik" , "Paul E. McKenney" , "Frederic Weisbecker" , "Neeraj Upadhyay" , "Joel Fernandes" , "Boqun Feng" , "Thomas Gleixner" , "Peter Zijlstra" , "Steven Rostedt" , "Masami Hiramatsu" , "Mark Rutland" , "Jiri Olsa" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , , "Catalin Marinas" , "Will Deacon" , "Puranjay Mohan" , "Xu Kuohai" , "Paul E. McKenney" , "Frederic Weisbecker" , "Neeraj Upadhyay" , "Joel Fernandes" , "Boqun Feng" , "Thomas Gleixner" , "Peter Zijlstra" , "Steven Rostedt" , "Masami Hiramatsu" , "Mark Rutland" , "Jiri Olsa" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , , "Catalin Marinas" , "Will Deacon" , "Puranjay Mohan" , "Xu Kuohai" X-Mailer: aerc 0.17.0 References: <20260915-b4-rcu-tasks-preempt-qs-v3-0-0ad30c4c5ee7@toxicpanda.com> <20260915-b4-rcu-tasks-preempt-qs-v3-6-0ad30c4c5ee7@toxicpanda.com> In-Reply-To: <20260915-b4-rcu-tasks-preempt-qs-v3-6-0ad30c4c5ee7@toxicpanda.com> On Tue Sep 15, 2026 at 1:17 PM UTC, Josef Bacik wrote: > +static __always_inline void bpf_tramp_read_lock_trace(void) > +{ > + if (IS_ENABLED(CONFIG_TASKS_RCU_TRAMPOLINE_READERS)) > + rcu_read_lock_trace(); > +} > + > +static __always_inline void bpf_tramp_read_unlock_trace(void) > +{ > + if (IS_ENABLED(CONFIG_TASKS_RCU_TRAMPOLINE_READERS)) > + rcu_read_unlock_trace(); > +} > + > +static u64 notrace __rcu_trampoline > +__bpf_prog_enter_recur(struct bpf_prog *prog, struct bpf_tramp_run_ctx *= run_ctx) > __acquires(RCU) > { > + bpf_tramp_read_lock_trace(); > rcu_read_lock_dont_migrate(); This is double increment. rcu_read_lock_dont_migrate() includes rcu_read_lock_trace().