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Fri, 11 Sep 2026 07:59:05 +0000 X-Mizu-Trace-ID: 70c9cc29d1278767 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, 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, 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 v3 03/15] mm/ksm: convert process iterator to for_each_process_rculock Date: Fri, 11 Sep 2026 15:57:48 +0800 Message-Id: <20260911075800.491472-4-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260911075800.491472-1-ye.liu@linux.dev> References: <20260911075800.491472-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: knfqoac8eqz9987zxzdx8iu81sbuc5wo X-Rspam-User: X-Rspamd-Queue-Id: E6A57A0008 X-Rspamd-Server: rspam03 X-HE-Tag: 1789113546-502709 X-HE-Meta: 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 nFrcgLpL gN6/Vlenz9fvThskHaeuACaYfdiDuBK9MSkOL/B6JM8r0ZqdBBNF/BgPGMV1alYYi2ZcV6vcCsQEACJx2Pl3aGVgSfvVvw6aei0LVfr3TfjzfSiZO+OGNUqIeGflw8CtE24U9zNXif6RaZmKpDyARZZt5HiaLoppztGw6TkYdPXeb2choD6yLnm47Pk4a/CtG0+cst4X+hnpieBDiRtLkjPGYq+srCOhGR+HggzYUNnq8u0bVH8it+WO48e/IJreIaUgnDW+74p4KrUPlxyFCPXMk4NYs2wdE9FUWj/gKVTHW/Br0LmntbGdD6N4QbK/QRJAYsRZAVCJQisEIQRaGcPZBDqSiEtQbJ0D0xMxFIsOeoJ1DWExgFMYRjnOR02b/xBJfeOZZDs16Laag3PQeyMDII3xiEmNZWphNHOO0chN1Veme3ePdGdO4WuYKMbK/uxMZhjNfXPbGLdmu7pFKeDMuYZ2wvWvSy7ShodFQqpxufoA= 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) --- Changes in v2: - Rename *_rcu to *_rculock 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