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Thu, 21 Aug 2025 02:06:20 -0700 (PDT) Received: from 7940hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-76ea0c16351sm1708937b3a.14.2025.08.21.02.06.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Aug 2025 02:06:20 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org, paulmck@kernel.org Cc: frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, boqun.feng@gmail.com, urezki@gmail.com, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf-next v3 0/7] bpf: introduce and use rcu_read_lock_dont_migrate Date: Thu, 21 Aug 2025 17:06:02 +0800 Message-ID: <20250821090609.42508-1-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit migrate_disable() and rcu_read_lock() are used to together in many case in bpf. However, when PREEMPT_RCU is not enabled, rcu_read_lock() will disable preemption, which indicate migrate_disable(), so we don't need to call it in this case. In this series, we introduce rcu_read_lock_dont_migrate and rcu_read_unlock_migrate, which will call migrate_disable and migrate_enable only when PREEMPT_RCU enabled. And use rcu_read_lock_dont_migrate in bpf subsystem. Changes since V2: * make rcu_read_lock_dont_migrate() more compatible by using IS_ENABLED() Changes since V1: * introduce rcu_read_lock_dont_migrate() instead of rcu_migrate_disable() + rcu_read_lock() Menglong Dong (7): rcu: add rcu_read_lock_dont_migrate() bpf: use rcu_read_lock_dont_migrate() for bpf_cgrp_storage_free() bpf: use rcu_read_lock_dont_migrate() for bpf_inode_storage_free() bpf: use rcu_read_lock_dont_migrate() for bpf_iter_run_prog() bpf: use rcu_read_lock_dont_migrate() for bpf_task_storage_free() bpf: use rcu_read_lock_dont_migrate() for bpf_prog_run_array_cg() bpf: use rcu_read_lock_dont_migrate() for trampoline.c include/linux/rcupdate.h | 14 ++++++++++++++ kernel/bpf/bpf_cgrp_storage.c | 6 ++---- kernel/bpf/bpf_inode_storage.c | 6 ++---- kernel/bpf/bpf_iter.c | 6 ++---- kernel/bpf/bpf_task_storage.c | 6 ++---- kernel/bpf/cgroup.c | 6 ++---- kernel/bpf/trampoline.c | 18 ++++++------------ 7 files changed, 30 insertions(+), 32 deletions(-) -- 2.50.1