linux-kernel - [GIT PULL] cgroup fixes for v5.18-rc6

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Date:   Thu, 12 May 2022 07:29:58 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [GIT PULL] cgroup fixes for v5.18-rc6

Hello,

This pull contains one commit - Waiman's fix for cgroup2 cpuset bug where it
could miss nodes which were hot-added.

Thanks.

The following changes since commit a7391ad3572431a354c927cf8896e86e50d7d0bf:

  Merge tag 'iomm-fixes-v5.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu (2022-05-04 11:04:52 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.18-fixes

for you to fetch changes up to 2685027fca387b602ae565bff17895188b803988:

  cgroup/cpuset: Remove cpus_allowed/mems_allowed setup in cpuset_init_smp() (2022-05-05 08:57:00 -1000)

----------------------------------------------------------------
Waiman Long (1):
      cgroup/cpuset: Remove cpus_allowed/mems_allowed setup in cpuset_init_smp()

 kernel/cgroup/cpuset.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 9390bfd9f1cd..71a418858a5e 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -3390,8 +3390,11 @@ static struct notifier_block cpuset_track_online_nodes_nb = {
  */
 void __init cpuset_init_smp(void)
 {
-	cpumask_copy(top_cpuset.cpus_allowed, cpu_active_mask);
-	top_cpuset.mems_allowed = node_states[N_MEMORY];
+	/*
+	 * cpus_allowd/mems_allowed set to v2 values in the initial
+	 * cpuset_bind() call will be reset to v1 values in another
+	 * cpuset_bind() call when v1 cpuset is mounted.
+	 */
 	top_cpuset.old_mems_allowed = top_cpuset.mems_allowed;
 
 	cpumask_copy(top_cpuset.effective_cpus, cpu_active_mask);