Hi Tejun, After merging the cgroup tree, today's linux-next build (powerpc ppc64_defconfig) failed like this: kernel/cgroup.c: In function 'cgroup_mount': kernel/cgroup.c:1572:2: error: too few arguments to function 'kernfs_mount' dentry = kernfs_mount(fs_type, flags, root->kf_root); ^ Caused by commit 2bd59d48ebfb ("cgroup: convert to kernfs") interacting with commit fed95bab8d29 ("sysfs: fix namespace refcnt leak") from the driver-core.current tree. I added the following merge fix patch, but it may not be completely correct, please check. From: Stephen Rothwell Date: Wed, 26 Feb 2014 17:41:51 +1100 Subject: [PATCH] cgroup: fix up for kernfs_mount API change Signed-off-by: Stephen Rothwell --- kernel/cgroup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 306ad0ed19ef..8f4ddbe23d58 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1569,7 +1569,7 @@ out_unlock: if (ret) return ERR_PTR(ret); - dentry = kernfs_mount(fs_type, flags, root->kf_root); + dentry = kernfs_mount(fs_type, flags, root->kf_root, NULL); if (IS_ERR(dentry)) cgroup_put(&root->top_cgroup); return dentry; -- 1.9.0 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au