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Sun, 11 May 2025 19:49:56 -0700 (PDT) From: Jason Xing To: axboe@kernel.dk, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Jason Xing , Yushan Zhou Subject: [PATCH v1 5/5] relayfs: uniformally use possible cpu iteration Date: Mon, 12 May 2025 10:49:35 +0800 Message-Id: <20250512024935.64704-6-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250512024935.64704-1-kerneljasonxing@gmail.com> References: <20250512024935.64704-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jason Xing Use for_each_possible_cpu to create per-cpu relayfs file to avoid later hotplug cpu which doesn't have its own file. Reviewed-by: Yushan Zhou Signed-off-by: Jason Xing --- kernel/relay.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/relay.c b/kernel/relay.c index 27f7e701724f..dcb099859e83 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -519,7 +519,7 @@ struct rchan *relay_open(const char *base_filename, kref_init(&chan->kref); =20 mutex_lock(&relay_channels_mutex); - for_each_online_cpu(i) { + for_each_possible_cpu(i) { buf =3D relay_open_buf(chan, i); if (!buf) goto free_bufs; @@ -615,7 +615,7 @@ int relay_late_setup_files(struct rchan *chan, * no files associated. So it's safe to call relay_setup_buf_file() * on all currently online CPUs. */ - for_each_online_cpu(i) { + for_each_possible_cpu(i) { buf =3D *per_cpu_ptr(chan->buf, i); if (unlikely(!buf)) { WARN_ONCE(1, KERN_ERR "CPU has no buffer!\n"); --=20 2.43.5