cgroup: replace pr_warning with preferred pr_warn

As suggested by scripts/checkpatch.pl, substitude all pr_warning()
with pr_warn().

No functional change.
Signed-off-by: Jianyu Zhan <nasa4836@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/cgroup.c

@@ -1126,9 +1126,9 @@ static int rebind_subsystems(struct cgroup_root *dst_root,
 		 * Just warn about it and continue.
 		 */
 		if (cgrp_dfl_root_visible) {
-			pr_warning("cgroup: failed to create files (%d) while rebinding 0x%lx to default root\n",
-				   ret, ss_mask);
-			pr_warning("cgroup: you may retry by moving them to a different hierarchy and unbinding\n");
+			pr_warn("cgroup: failed to create files (%d) while rebinding 0x%lx to default root\n",
+				ret, ss_mask);
+			pr_warn("cgroup: you may retry by moving them to a different hierarchy and unbinding\n");
 		}
 	}
 
@@ -1323,7 +1323,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 	/* Consistency checks */
 
 	if (opts->flags & CGRP_ROOT_SANE_BEHAVIOR) {
-		pr_warning("cgroup: sane_behavior: this is still under development and its behaviors will change, proceed at your own risk\n");
+		pr_warn("cgroup: sane_behavior: this is still under development and its behaviors will change, proceed at your own risk\n");
 
 		if ((opts->flags & (CGRP_ROOT_NOPREFIX | CGRP_ROOT_XATTR)) ||
 		    opts->cpuset_clone_children || opts->release_agent ||
@@ -1387,8 +1387,8 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data)
 		goto out_unlock;
 
 	if (opts.subsys_mask != root->subsys_mask || opts.release_agent)
-		pr_warning("cgroup: option changes via remount are deprecated (pid=%d comm=%s)\n",
-			   task_tgid_nr(current), current->comm);
+		pr_warn("cgroup: option changes via remount are deprecated (pid=%d comm=%s)\n",
+			task_tgid_nr(current), current->comm);
 
 	added_mask = opts.subsys_mask & ~root->subsys_mask;
 	removed_mask = root->subsys_mask & ~opts.subsys_mask;
@@ -1669,7 +1669,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
 				ret = -EINVAL;
 				goto out_unlock;
 			} else {
-				pr_warning("cgroup: new mount options do not match the existing superblock, will be ignored\n");
+				pr_warn("cgroup: new mount options do not match the existing superblock, will be ignored\n");
 			}
 		}
 
@@ -4168,10 +4168,10 @@ static int create_css(struct cgroup *cgrp, struct cgroup_subsys *ss)
 
 	if (ss->broken_hierarchy && !ss->warned_broken_hierarchy &&
 	    parent->parent) {
-		pr_warning("cgroup: %s (%d) created nested cgroup for controller \"%s\" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.\n",
-			   current->comm, current->pid, ss->name);
+		pr_warn("cgroup: %s (%d) created nested cgroup for controller \"%s\" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.\n",
+			current->comm, current->pid, ss->name);
 		if (!strcmp(ss->name, "memory"))
-			pr_warning("cgroup: \"memory\" requires setting use_hierarchy to 1 on the root.\n");
+			pr_warn("cgroup: \"memory\" requires setting use_hierarchy to 1 on the root.\n");
 		ss->warned_broken_hierarchy = true;
 	}