cgroup: Use more current logging style

Use pr_fmt and remove embedded prefixes.
Realign modified multi-line statements to open parenthesis.
Convert embedded function name to "%s: ", __func__
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/cgroup.c

@@ -26,6 +26,8 @@
  *  distribution for more details.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/cgroup.h>
 #include <linux/cred.h>
 #include <linux/ctype.h>
@@ -1126,9 +1128,9 @@ static int rebind_subsystems(struct cgroup_root *dst_root,
 		 * Just warn about it and continue.
 		 */
 		if (cgrp_dfl_root_visible) {
-			pr_warn("cgroup: failed to create files (%d) while rebinding 0x%lx to default root\n",
+			pr_warn("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");
+			pr_warn("you may retry by moving them to a different hierarchy and unbinding\n");
 		}
 	}
 
@@ -1323,12 +1325,12 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 	/* Consistency checks */
 
 	if (opts->flags & CGRP_ROOT_SANE_BEHAVIOR) {
-		pr_warn("cgroup: sane_behavior: this is still under development and its behaviors will change, proceed at your own risk\n");
+		pr_warn("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 ||
 		    opts->name) {
-			pr_err("cgroup: sane_behavior: noprefix, xattr, clone_children, release_agent and name are not allowed\n");
+			pr_err("sane_behavior: noprefix, xattr, clone_children, release_agent and name are not allowed\n");
 			return -EINVAL;
 		}
 	} else {
@@ -1374,7 +1376,7 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data)
 	unsigned long added_mask, removed_mask;
 
 	if (root->flags & CGRP_ROOT_SANE_BEHAVIOR) {
-		pr_err("cgroup: sane_behavior: remount is not allowed\n");
+		pr_err("sane_behavior: remount is not allowed\n");
 		return -EINVAL;
 	}
 
@@ -1387,7 +1389,7 @@ 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_warn("cgroup: option changes via remount are deprecated (pid=%d comm=%s)\n",
+		pr_warn("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;
@@ -1396,7 +1398,7 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data)
 	/* Don't allow flags or name to change at remount */
 	if (((opts.flags ^ root->flags) & CGRP_ROOT_OPTION_MASK) ||
 	    (opts.name && strcmp(opts.name, root->name))) {
-		pr_err("cgroup: option or name mismatch, new: 0x%lx \"%s\", old: 0x%lx \"%s\"\n",
+		pr_err("option or name mismatch, new: 0x%lx \"%s\", old: 0x%lx \"%s\"\n",
 		       opts.flags & CGRP_ROOT_OPTION_MASK, opts.name ?: "",
 		       root->flags & CGRP_ROOT_OPTION_MASK, root->name);
 		ret = -EINVAL;
@@ -1665,11 +1667,11 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
 
 		if ((root->flags ^ opts.flags) & CGRP_ROOT_OPTION_MASK) {
 			if ((root->flags | opts.flags) & CGRP_ROOT_SANE_BEHAVIOR) {
-				pr_err("cgroup: sane_behavior: new mount options should match the existing superblock\n");
+				pr_err("sane_behavior: new mount options should match the existing superblock\n");
 				ret = -EINVAL;
 				goto out_unlock;
 			} else {
-				pr_warn("cgroup: new mount options do not match the existing superblock, will be ignored\n");
+				pr_warn("new mount options do not match the existing superblock, will be ignored\n");
 			}
 		}
 
@@ -2889,8 +2891,8 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
 		if (is_add) {
 			ret = cgroup_add_file(cgrp, cft);
 			if (ret) {
-				pr_warn("cgroup_addrm_files: failed to add %s, err=%d\n",
-					cft->name, ret);
+				pr_warn("%s: failed to add %s, err=%d\n",
+					__func__, cft->name, ret);
 				return ret;
 			}
 		} else {
@@ -4168,10 +4170,10 @@ static int create_css(struct cgroup *cgrp, struct cgroup_subsys *ss)
 
 	if (ss->broken_hierarchy && !ss->warned_broken_hierarchy &&
 	    parent->parent) {
-		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",
+		pr_warn("%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_warn("cgroup: \"memory\" requires setting use_hierarchy to 1 on the root.\n");
+			pr_warn("\"memory\" requires setting use_hierarchy to 1 on the root\n");
 		ss->warned_broken_hierarchy = true;
 	}