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Commit b5e61818 authored by Pavel Emelianov's avatar Pavel Emelianov Committed by Linus Torvalds
Browse files

Introduce a handy list_first_entry macro 



There are many places in the kernel where the construction like

   foo = list_entry(head->next, struct foo_struct, list);

are used.
The code might look more descriptive and neat if using the macro

   list_first_entry(head, type, member) \
             list_entry((head)->next, type, member)

Here is the macro itself and the examples of its usage in the generic code.
 If it will turn out to be useful, I can prepare the set of patches to
inject in into arch-specific code, drivers, networking, etc.

Signed-off-by: default avatarPavel Emelianov <xemul@openvz.org>
Signed-off-by: default avatarKirill Korotaev <dev@openvz.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: John McCutchan <ttb@tentacle.dhs.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent db9c02fa

fs/dquot.c

+1 −1
Original line number Diff line number Diff line
@@ -474,7 +474,7 @@ int vfs_quota_sync(struct super_block *sb, int type) 
		spin_lock(&dq_list_lock);

		dirty = &dqopt->info[cnt].dqi_dirty_list;

		while (!list_empty(dirty)) {

			dquot = list_entry(dirty->next, struct dquot, dq_dirty);

			dquot = list_first_entry(dirty, struct dquot, dq_dirty);

			/* Dirty and inactive can be only bad dquot... */

			if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {

				clear_dquot_dirty(dquot);

fs/eventpoll.c

+3 −3
Original line number Diff line number Diff line
@@ -453,7 +453,7 @@ void eventpoll_release_file(struct file *file) 
	mutex_lock(&epmutex);



	while (!list_empty(lsthead)) {

		epi = list_entry(lsthead->next, struct epitem, fllink);

		epi = list_first_entry(lsthead, struct epitem, fllink);



		ep = epi->ep;

		list_del_init(&epi->fllink);
@@ -1143,7 +1143,7 @@ static void ep_unregister_pollwait(struct eventpoll *ep, struct epitem *epi) 


	if (nwait) {

		while (!list_empty(lsthead)) {

			pwq = list_entry(lsthead->next, struct eppoll_entry, llink);

			pwq = list_first_entry(lsthead, struct eppoll_entry, llink);



			list_del_init(&pwq->llink);

			remove_wait_queue(pwq->whead, &pwq->wait);
@@ -1359,7 +1359,7 @@ static int ep_send_events(struct eventpoll *ep, struct list_head *txlist, 
	 * read.

	 */

	for (eventcnt = 0; !list_empty(txlist) && eventcnt < maxevents;) {

		epi = list_entry(txlist->next, struct epitem, rdllink);

		epi = list_first_entry(txlist, struct epitem, rdllink);

		prefetch(epi->rdllink.next);



		/*

fs/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -275,7 +275,7 @@ static void dispose_list(struct list_head *head) 
	while (!list_empty(head)) {

		struct inode *inode;



		inode = list_entry(head->next, struct inode, i_list);

		inode = list_first_entry(head, struct inode, i_list);

		list_del(&inode->i_list);



		if (inode->i_data.nrpages)

fs/inotify.c

+1 −1
Original line number Diff line number Diff line
@@ -509,7 +509,7 @@ void inotify_destroy(struct inotify_handle *ih) 
			mutex_unlock(&ih->mutex);

			break;

		}

		watch = list_entry(watches->next, struct inotify_watch, h_list);

		watch = list_first_entry(watches, struct inotify_watch, h_list);

		get_inotify_watch(watch);

		mutex_unlock(&ih->mutex);

fs/namespace.c

+2 −2
Original line number Diff line number Diff line
@@ -499,7 +499,7 @@ void release_mounts(struct list_head *head) 
{

	struct vfsmount *mnt;

	while (!list_empty(head)) {

		mnt = list_entry(head->next, struct vfsmount, mnt_hash);

		mnt = list_first_entry(head, struct vfsmount, mnt_hash);

		list_del_init(&mnt->mnt_hash);

		if (mnt->mnt_parent != mnt) {

			struct dentry *dentry;
@@ -1177,7 +1177,7 @@ static void expire_mount_list(struct list_head *graveyard, struct list_head *mou 


	while (!list_empty(graveyard)) {

		LIST_HEAD(umounts);

		mnt = list_entry(graveyard->next, struct vfsmount, mnt_expire);

		mnt = list_first_entry(graveyard, struct vfsmount, mnt_expire);

		list_del_init(&mnt->mnt_expire);



		/* don't do anything if the namespace is dead - all the