cgroup: remove CGRP_ROOT_OPTION_MASK

cgroup_root->flags only contains CGRP_ROOT_* flags and there's no
reason to mask the flags.  Remove CGRP_ROOT_OPTION_MASK.

This doesn't cause any behavior differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 28853e7..c4901c1 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -320,9 +320,6 @@ enum {
 
        CGRP_ROOT_NOPREFIX      = (1 << 1), /* mounted subsystems have no named prefix */
        CGRP_ROOT_XATTR         = (1 << 2), /* supports extended attributes */
-
-       /* mount options live below bit 16 */
-       CGRP_ROOT_OPTION_MASK   = (1 << 16) - 1,
 };
 
 /*

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index cd02e99..5411fff 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1490,11 +1490,10 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data)
        removed_mask = root->subsys_mask & ~opts.subsys_mask;
 
        /* Don't allow flags or name to change at remount */
-       if (((opts.flags ^ root->flags) & CGRP_ROOT_OPTION_MASK) ||
+       if ((opts.flags ^ root->flags) ||
            (opts.name && strcmp(opts.name, root->name))) {
                pr_err("option or name mismatch, new: 0x%x \"%s\", old: 0x%x \"%s\"\n",
-                      opts.flags & CGRP_ROOT_OPTION_MASK, opts.name ?: "",
-                      root->flags & CGRP_ROOT_OPTION_MASK, root->name);
+                      opts.flags, opts.name ?: "", root->flags, root->name);
                ret = -EINVAL;
                goto out_unlock;
        }
@@ -1762,7 +1761,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
                        goto out_unlock;
                }
 
-               if ((root->flags ^ opts.flags) & CGRP_ROOT_OPTION_MASK) {
+               if (root->flags ^ opts.flags) {
                        if ((root->flags | opts.flags) & CGRP_ROOT_SANE_BEHAVIOR) {
                                pr_err("sane_behavior: new mount options should match the existing superblock\n");
                                ret = -EINVAL;