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Mon, 21 Sep 2026 09:24:43 +0000 X-Mizu-Trace-ID: c113fa249d93a37b X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Tony Luck , Reinette Chatre , x86@kernel.org, Christian Brauner , Jann Horn , Jan Kara , Al Viro , Andrew Morton , Alexey Dobriyan , Ye Liu , "Mike Rapoport (Microsoft)" , Oleg Nesterov Cc: Michal Hocko , SJ Park , Gregory Price , Lorenzo Stoakes , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.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, 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 Subject: [PATCH v4 13/15] fs: convert process/thread iterators to for_each_*_rculock Date: Mon, 21 Sep 2026 17:20:59 +0800 Message-Id: <20260921092101.89285-14-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260921092101.89285-1-ye.liu@linux.dev> References: <20260921092101.89285-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4DFDB40006 X-Stat-Signature: 51eyb463u4akrb6is1onk16q1jxqqg4s X-Rspam-User: X-HE-Tag: 1789982685-527272 X-HE-Meta: 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 y5XrabFn KhwnN0+yAxfmerYE2iPVtXGm5IrxGAKdVJB2AAQyh3BH+UEH436RXcLV8FKdxRRiaIyAZwIjwbjB2LqkC54GZIumFHld70oZClssLcgZlq5do9E4Tm0yTTQl0qmZW30DF6RuiqCf7YX+zTIk3azV9nxa6AXJJUfs/coxqZKdGiblbFiBXlG9a1oDvy0WPGVfTxQMsnhZVstJmjhxODOekcoPj6Oo7YXgw7u7ziGGfVKosHw+ccy4WUf9LVP8lzqY89BxZahKpYMrwGjno2Xmd7FKwtdVqMN0h56XakvfM9EfxvQtclcd+Ofu69n6GQy9psCVOYPdylhEN+zTf3QnV+JJHp5CU5S5eL/L2tYMeaFz620ADAujTVKrIJOZ9wAHqQByIJR9ph6RoUhD4rxWBLMyz1KHzmRccst28lHNrGJ4poqtwdmLMN7DowM9LvE7Vb7CT0oOUJjNi4i+JkdH+po9hFKTXzLeWIvtABYUQj0jbps0= 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 Reviewed-by: SJ Park Reviewed-by: Gregory Price (Meta) Reviewed-by: Lorenzo Stoakes (ARM) --- 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