From: Mike Yuan <me@yhndnzj.com>
Date: Tue, 30 Jul 2024 18:35:10 +0000 (+0200)
Subject: cgroup-setup: kernel threads can reside in arbitrary cgroups
X-Git-Tag: v257-rc1~753^2~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e6d305573458c640b97046667bb39a0d0e6bfa8;p=thirdparty%2Fsystemd.git

cgroup-setup: kernel threads can reside in arbitrary cgroups

Realistically this doesn't matter, as cg_migrate() is only
used to populate init.scope. But it's probably better to
make things clear.
---

diff --git a/src/shared/cgroup-setup.c b/src/shared/cgroup-setup.c
index 62927773697..cf7a0eb2720 100644
--- a/src/shared/cgroup-setup.c
+++ b/src/shared/cgroup-setup.c
@@ -639,10 +639,7 @@ int cg_migrate(
                         if (set_contains(s, PID_TO_PTR(pid)))
                                 continue;
 
-                        /* Ignore kernel threads. Since they can only exist in the root cgroup, we only
-                         * check for them there. */
-                        if (cfrom && empty_or_root(pfrom) &&
-                            pid_is_kernel_thread(pid) > 0)
+                        if (pid_is_kernel_thread(pid) > 0)
                                 continue;
 
                         r = cg_attach(cto, pto, pid);