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Mon, 07 Sep 2026 08:15:06 +0000 X-Mizu-Trace-ID: b383245cc3c82e7c X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Tony Luck , Reinette Chatre , x86@kernel.org, Christian Brauner , Andrew Morton , Jann Horn , "Mike Rapoport (Microsoft)" , "David Hildenbrand (arm)" , Alexey Dobriyan , Lorenzo Stoakes , Oleg Nesterov Cc: Ye Liu , Michal Hocko , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, sj@kernel.org, rientjes@google.com, shakeel.butt@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, will@kernel.org, boqun@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pavel@kernel.org, lance.yang@linux.dev, mhiramat@kernel.org, pmladek@suse.com, longman@redhat.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, mark.rutland@arm.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rcu@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 6/8] fs: convert process/thread iterators to for_each_*_rculock Date: Mon, 7 Sep 2026 16:13:32 +0800 Message-Id: <20260907081334.1152889-7-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260907081334.1152889-1-ye.liu@linux.dev> References: <20260907081334.1152889-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 8A7EF100007 X-Stat-Signature: uucra8kgwkfjhy87zwgr3ugcrkjfi9po X-HE-Tag: 1788768919-712106 X-HE-Meta: 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 eZ048c2q vMgzED4USlkI3AuH9uU08YEqFCh/imU6Ph1/fQrjoFcph3LO+M7x4uixoMlkNcgPX5T8rAGxzfVXqryRQfas9MaiXjm+L+MqcpOb8RGzGUObjbk7K0WNICO2Z9u//CVKnwhIJSBuZruxjVe8qJBGBccS6MSorx8aIYcBVFyF8eZDGU0/ozMb1yaCZPrN5nu+48VLfB3LwV4ApM1ixGmNPyr/gqblHzTBiOqqhnbz9g5q34YA+LzPUWlgPoiE9dFRgydfvopqp9Bd+/KD1x4ewvT67VDx88oWbKwv2G3ryTwOt8Pj/Li6rkysH9myZcNtJNni5QSgfE05dO0ovrVPua6uQ/ErumOBUL05BGtEuMk1o+xJ1AaOgOmaHHUid5DwwsodVud59npY/dWzl70nOOptg/8eALpTJrpSj Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu Replace the manual rcu_read_lock()/rcu_read_unlock() pairs combined with for_each_process() and for_each_process_thread() loops in fs/ with the for_each_*_rculock() macros, which scope the RCU read lock to the loop body via scoped_guard(rcu). No functional change. Signed-off-by: Ye Liu Acked-by: Michal Hocko --- Changes in v2: - Rename *_rcu to *_rculock fs/proc/base.c | 4 +--- fs/resctrl/rdtgroup.c | 8 ++------ 2 files changed, 3 insertions(+), 9 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 6a39de424f62..3de4f4557e4c 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1160,8 +1160,7 @@ static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) if (mm) { struct task_struct *p; - rcu_read_lock(); - for_each_process(p) { + for_each_process_rculock(p) { if (same_thread_group(task, p)) continue; @@ -1177,7 +1176,6 @@ static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) } task_unlock(p); } - rcu_read_unlock(); mmdrop(mm); } err_unlock: diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 5dcbb0a964e8..b14df8b23f1a 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -709,14 +709,12 @@ int rdtgroup_tasks_assigned(struct rdtgroup *r) lockdep_assert_held(&rdtgroup_mutex); - rcu_read_lock(); - for_each_process_thread(p, t) { + for_each_process_thread_rculock(p, t) { if (is_closid_match(t, r) || is_rmid_match(t, r)) { ret = 1; break; } } - rcu_read_unlock(); return ret; } @@ -826,15 +824,13 @@ static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s) struct task_struct *p, *t; pid_t pid; - rcu_read_lock(); - for_each_process_thread(p, t) { + for_each_process_thread_rculock(p, t) { if (is_closid_match(t, r) || is_rmid_match(t, r)) { pid = task_pid_vnr(t); if (pid) seq_printf(s, "%d\n", pid); } } - rcu_read_unlock(); } static int rdtgroup_tasks_show(struct kernfs_open_file *of, -- 2.25.1