linux-kernel - [PATCH] cgroup: list_for

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20080604183412.9421.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 04 Jun 2008 18:36:00 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	menage@...gle.com, linux-kernel@...r.kernel.org,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH] cgroup: list_for_each cleanup v2


--------------------------
while() {
	list_entry();
	...
}
--------------------------

is equivalent to following code.

--------------------------
list_for_each_entry(){
	...
}
--------------------------

later can review easily more.

this patch is just clean up.
it doesn't have any behavor change.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

---
 kernel/cgroup.c |   44 +++++++++++++++++++++-----------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

Index: b/kernel/cgroup.c
===================================================================
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -241,17 +241,20 @@ static int use_task_css_set_links;
  */
 static void unlink_css_set(struct css_set *cg)
 {
+	struct cg_cgroup_link *link;
+	struct cg_cgroup_link *saved_link;
+
 	write_lock(&css_set_lock);
 	hlist_del(&cg->hlist);
 	css_set_count--;
-	while (!list_empty(&cg->cg_links)) {
-		struct cg_cgroup_link *link;
-		link = list_entry(cg->cg_links.next,
-				  struct cg_cgroup_link, cg_link_list);
+
+	list_for_each_entry_safe(link, saved_link, &cg->cg_links,
+				 cg_link_list) {
 		list_del(&link->cg_link_list);
 		list_del(&link->cgrp_link_list);
 		kfree(link);
 	}
+
 	write_unlock(&css_set_lock);
 }
 
@@ -363,15 +366,14 @@ static struct css_set *find_existing_css
 static int allocate_cg_links(int count, struct list_head *tmp)
 {
 	struct cg_cgroup_link *link;
+	struct cg_cgroup_link *saved_link;
 	int i;
 	INIT_LIST_HEAD(tmp);
 	for (i = 0; i < count; i++) {
 		link = kmalloc(sizeof(*link), GFP_KERNEL);
 		if (!link) {
-			while (!list_empty(tmp)) {
-				link = list_entry(tmp->next,
-						  struct cg_cgroup_link,
-						  cgrp_link_list);
+			list_for_each_entry_safe(link, saved_link, tmp,
+						 cgrp_link_list) {
 				list_del(&link->cgrp_link_list);
 				kfree(link);
 			}
@@ -384,11 +386,10 @@ static int allocate_cg_links(int count, 
 
 static void free_cg_links(struct list_head *tmp)
 {
-	while (!list_empty(tmp)) {
-		struct cg_cgroup_link *link;
-		link = list_entry(tmp->next,
-				  struct cg_cgroup_link,
-				  cgrp_link_list);
+	struct cg_cgroup_link *link;
+	struct cg_cgroup_link *saved_link;
+
+	list_for_each_entry_safe(link, saved_link, tmp, cgrp_link_list) {
 		list_del(&link->cgrp_link_list);
 		kfree(link);
 	}
@@ -1093,6 +1094,8 @@ static void cgroup_kill_sb(struct super_
 	struct cgroupfs_root *root = sb->s_fs_info;
 	struct cgroup *cgrp = &root->top_cgroup;
 	int ret;
+	struct cg_cgroup_link *link;
+	struct cg_cgroup_link *saved_link;
 
 	BUG_ON(!root);
 
@@ -1112,10 +1115,9 @@ static void cgroup_kill_sb(struct super_
 	 * root cgroup
 	 */
 	write_lock(&css_set_lock);
-	while (!list_empty(&cgrp->css_sets)) {
-		struct cg_cgroup_link *link;
-		link = list_entry(cgrp->css_sets.next,
-				  struct cg_cgroup_link, cgrp_link_list);
+
+	list_for_each_entry_safe(link, saved_link, &cgrp->css_sets,
+				 cgrp_link_list) {
 		list_del(&link->cg_link_list);
 		list_del(&link->cgrp_link_list);
 		kfree(link);
@@ -1756,15 +1758,11 @@ int cgroup_add_files(struct cgroup *cgrp
 int cgroup_task_count(const struct cgroup *cgrp)
 {
 	int count = 0;
-	struct list_head *l;
+	struct cg_cgroup_link *link;
 
 	read_lock(&css_set_lock);
-	l = cgrp->css_sets.next;
-	while (l != &cgrp->css_sets) {
-		struct cg_cgroup_link *link =
-			list_entry(l, struct cg_cgroup_link, cgrp_link_list);
+	list_for_each_entry(link, &cgrp->css_sets, cgrp_link_list) {
 		count += atomic_read(&link->cg->ref.refcount);
-		l = l->next;
 	}
 	read_unlock(&css_set_lock);
 	return count;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/