Commit 2f6c6d08 authored Oct 14, 2020 by Linus Torvalds

cgroup

Pull cgroup updates from Tejun Heo:
 "Two minor changes.

  One makes cgroup interface files ignore zero-sized writes rather than
  triggering -EINVAL on them. The other change is a cleanup which
  doesn't cause any behavior changes"

* 'for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: Zero sized write should be no-op
  cgroup: remove redundant kernfs_activate in cgroup_setup_root()

parents 09cad075 65026da5

kernel/cgroup/cgroup.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -2006,7 +2006,6 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
		BUG_ON(!list_empty(&root_cgrp->self.children));
		BUG_ON(atomic_read(&root->nr_cgrps) != 1);

		kernfs_activate(root_cgrp->kn);
		ret = 0;
		goto out;

		@@ -3682,6 +3681,9 @@ static ssize_t cgroup_file_write(struct kernfs_open_file of, char buf,
		struct cgroup_subsys_state *css;
		int ret;

		if (!nbytes)
		return 0;

		/*
		* If namespaces are delegation boundaries, disallow writes to
		* files in an non-init namespace root from inside the namespace

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