linux-kernel - [PATCH v1 5/5] relayfs: uniformally use possible cpu iteration

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250512024935.64704-6-kerneljasonxing@gmail.com>
Date: Mon, 12 May 2025 10:49:35 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: axboe@...nel.dk,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>,
	Yushan Zhou <katrinzhou@...cent.com>
Subject: [PATCH v1 5/5] relayfs: uniformally use possible cpu iteration

From: Jason Xing <kernelxing@...cent.com>

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 <katrinzhou@...cent.com>
Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 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);
 
 	mutex_lock(&relay_channels_mutex);
-	for_each_online_cpu(i) {
+	for_each_possible_cpu(i) {
 		buf = 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 = *per_cpu_ptr(chan->buf, i);
 		if (unlikely(!buf)) {
 			WARN_ONCE(1, KERN_ERR "CPU has no buffer!\n");
-- 
2.43.5