linux-kernel - cpuset: return -EINVAL for legacy non-subset child creation attempt

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Date:	Tue, 01 Dec 2015 16:22:37 +0100
From:	Mike Galbraith <efault@....de>
To:	Li Zefan <lizefan@...wei.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: cpuset: return -EINVAL for legacy non-subset child creation attempt

A legacy hierarchy child set that is not a subset of its parent is not
a permissions issue, it's an invalid configuration.  Return -EINVAL.

Signed-off-by: Mike Galbraith <efault@....de>
---
 kernel/cpuset.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -472,7 +472,7 @@ static int validate_change(struct cpuset
 	par = parent_cs(cur);
 
 	/* On legacy hiearchy, we must be a subset of our parent cpuset. */
-	ret = -EACCES;
+	ret = -EINVAL;
 	if (!cgroup_subsys_on_dfl(cpuset_cgrp_subsys) &&
 	    !is_cpuset_subset(trial, par))
 		goto out;
@@ -481,7 +481,6 @@ static int validate_change(struct cpuset
 	 * If either I or some sibling (!= me) is exclusive, we can't
 	 * overlap
 	 */
-	ret = -EINVAL;
 	cpuset_for_each_child(c, css, par) {
 		if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) &&
 		    c != cur &&


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