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Mon, 21 Sep 2026 09:22:09 +0000 X-Mizu-Trace-ID: e1e273a490565660 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Andrew Morton , David Hildenbrand Cc: Ye Liu , 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, oleg@redhat.com, tglx@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, tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.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 03/15] mm/ksm: convert process iterator to for_each_process_rculock Date: Mon, 21 Sep 2026 17:20:49 +0800 Message-Id: <20260921092101.89285-4-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-Rspam-User: X-Stat-Signature: k8z63xwieruiigazkeasgepyy994duwx X-Rspamd-Queue-Id: 23AED40008 X-Rspamd-Server: rspam07 X-HE-Tag: 1789982530-477993 X-HE-Meta: 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 i2+/c/FE BjLjHwpxeZB16ZGamSA3iqE0Sc39qTSrCDC/px5U/s13NpMQJmje0HUmwjTYGrdPOkciGzQydndKX2wg7RJQKfiXi9fLoW+ugZnFou0kLMFg4fpn9lLLUGVcmoeI4nmFMHwoxro4FPr2HMaIVLQEbB/O+c6r78z4eQf2UC4jOFT8Ss/q7ULydJdbt7BojAHx+eMAuUUncFrA0x6GViCFsrRVkVObY3WLXjAskFO4PspHRd0AkrFt/C0Y5Drswx/mtcAhSYgZuAfJSJOlQDYYY0CQHrK8S5yJevgHhSkzhfe44QquT/bcxfnXcAOdEVk3AtKE+JAZQC8KPrca7EX3dOSES3j5noOM6RwYzTGDdEBzk8w5jiYws+r6jnSN834ybUBjFd8G1wYXIVvoWD9Ykpav1XC26TSffjUZSW9tIi4J89vPTV3jg2aepMV0PiqddS6N8o97PHxlMsI9oNWoZnbG6rCovRw3tgOppZXoT1T7pvZc= 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() pair combined with for_each_process() loop in mm/ksm.c with for_each_process_rculock(), which scopes 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 Acked-by: David Hildenbrand (Arm) Reviewed-by: Gregory Price (Meta) Reviewed-by: Lorenzo Stoakes (ARM) --- mm/ksm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/ksm.c b/mm/ksm.c index 49d48d1e0998..69d30e80a090 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3280,8 +3280,7 @@ void collect_procs_ksm(const struct folio *folio, const struct page *page, struct anon_vma *av = rmap_item->anon_vma; anon_vma_lock_read(av); - rcu_read_lock(); - for_each_process(tsk) { + for_each_process_rculock(tsk) { struct anon_vma_chain *vmac; const unsigned long addr = rmap_item->address & PAGE_MASK; const unsigned long index = rmap_item->linear_page_index; @@ -3298,7 +3297,6 @@ void collect_procs_ksm(const struct folio *folio, const struct page *page, } } } - rcu_read_unlock(); anon_vma_unlock_read(av); } } -- 2.25.1