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Hallyn" Cc: Ye Liu , Justin Suess , =?UTF-8?q?G=C3=BCnther=20Noack?= , Gregory Price , SJ Park , Lorenzo Stoakes , akpm@linux-foundation.org, mhocko@suse.com, peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, oleg@redhat.com, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, 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, tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.org, 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 15/15] security/landlock: convert thread iterator to for_each_thread_rculock Date: Mon, 21 Sep 2026 17:33:33 +0800 Message-Id: <20260921093334.105291-1-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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: E225B100002 X-Stat-Signature: tw4aanjmowyfefjapicehryfc7px9ztr X-Rspamd-Server: rspam01 X-HE-Tag: 1789983231-280708 X-HE-Meta: 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 mELf33Ux 0wLlLF1JnQZf7TDsupdq59S02nO0xTWOD9YwN8iuyF36RwW6N6N9Y5ezPaqyFYJu16OzZU7Ouf8hFiV9ynmV3bBOajd2P3I3mMxlfiRLZ7Ac0Egzs8jZ0xooo1GYxCfxZHnK/30zklMqqiEfGgVLCS+iirsT1qqzf/P/ZA9dJqihu/Gl6MC+rUZQGvV1pFTL3eyasy3zaN7ZjjlUzEXhd72I1yfn+aqOwnFjPAMmnWQfI1+qhaUe/t931+1pCBLQR3++O4J0YwvS8W4kgVsZR9Gmj55fY/HTQeVOVauRA1qGL7xveQvF8IXX3NZcH/uf63l3R/CsDimC7gq0f0kjBRHmPlnED7rL8I2rbCz890g++ZuijYvxWBOcF66oG+BeoMx6P/G3FAj4fEHXW1gPyB055uSlb2e3zOxp7hgdCn7tcfwL9pBdKA+5MN6qYsYTKDeOFHer4NTltUYbkefbHbiFDdl8RDs5UHzriKCns5590Lf4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu Replace guard(rcu)() + for_each_thread() with for_each_thread_rculock(), which scopes the RCU read lock to the loop body via scoped_guard(rcu). No functional change. Signed-off-by: Ye Liu Reviewed-by: Justin Suess Reviewed-by: Günther Noack Reviewed-by: Gregory Price (Meta) Reviewed-by: SJ Park Reviewed-by: Lorenzo Stoakes (ARM) --- security/landlock/tsync.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/security/landlock/tsync.c b/security/landlock/tsync.c index 0b71e158c3f5..a578af640aad 100644 --- a/security/landlock/tsync.c +++ b/security/landlock/tsync.c @@ -335,9 +335,7 @@ static size_t count_additional_threads(const struct tsync_works *works) caller = current; - guard(rcu)(); - - for_each_thread(caller, thread) { + for_each_thread_rculock(caller, thread) { /* Skip current, since it is initiating the sync. */ if (thread == caller) continue; @@ -376,9 +374,7 @@ static bool schedule_task_work(struct tsync_works *works, caller = current; - guard(rcu)(); - - for_each_thread(caller, thread) { + for_each_thread_rculock(caller, thread) { /* Skip current, since it is initiating the sync. */ if (thread == caller) continue; -- 2.25.1