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Fri, 11 Sep 2026 08:01:53 +0000 X-Mizu-Trace-ID: 67efd391483b1f6c X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Josh Poimboeuf , Steven Rostedt Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, mic@digikod.net, tglx@kernel.org, akpm@linux-foundation.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, gourry@gourry.net, 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 12/15] unwind: convert process/thread iterator to for_each_process_thread_rculock Date: Fri, 11 Sep 2026 15:57:57 +0800 Message-Id: <20260911075800.491472-13-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-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: DF59A16000E X-Stat-Signature: juu47afoyigfeeh9duny8tamh8npu8da X-Rspam-User: X-HE-Tag: 1789113715-431814 X-HE-Meta: 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 B5B0V2SV Bk16sgixakKHxZuDTxe9hMauJapFCzCuTzNm+gE9ZuLIyBbCMAgjTTm6ScPhftcR1KhJyeoaVBwuZax80qq+bsuDWkpK4bFaXO/Z2Yehui3A70X4SMMHSgqoBLGrJrWNzSAWYM2Sggh90boJ6jmDt2fGLHui2VLOVajl/VZieCMDvhRL0Yk8GTMfVu41URuQUhP3N9hCtQpDI9Xn+9U5YOmj0iUUtknhXGXzPYYY3H+EOMwJhn/u4haJGfALS73ppDKv3BqpZUJRx233BlW13DM/T31q7wAWgyIRFt1dC/yEmCkCE3RSWClrHFQWgLTNv3VAwnwgHDvEA5Nb5rT3uZesxmdOQ11vFkBuLFdoJqDFj32q6B03GpjgI2H9p/0qaRYLD6DSkyYdkT0jsHxx8WEhIWwGHo2hAZ9Ejb3iyM6uH+iS3ypuoorzYFF4+wXf9OELnYY9A86ImUoc= 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)() combined with for_each_process_thread() loop in kernel/unwind/deferred.c with for_each_process_thread_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 Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Oleg Nesterov --- Changes in v3: - Split from kernel/ patch in v2 (Peter Zijlstra, Steven Rostedt) Changes in v2: - Rename *_rcu to *_rculock kernel/unwind/deferred.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/unwind/deferred.c b/kernel/unwind/deferred.c index 5bea47314254..ecfe1336095e 100644 --- a/kernel/unwind/deferred.c +++ b/kernel/unwind/deferred.c @@ -319,9 +319,8 @@ void unwind_deferred_cancel(struct unwind_work *work) synchronize_srcu(&unwind_srcu); - guard(rcu)(); /* Clear this bit from all threads */ - for_each_process_thread(g, t) { + for_each_process_thread_rculock(g, t) { atomic_long_andnot(BIT(bit), &t->unwind_info.unwind_mask); if (t->unwind_info.cache) -- 2.25.1