rculist: use list_entry_rcu in places where it's appropriate

Use previously introduced list_entry_rcu instead of an open-coded
list_entry + rcu_dereference combination.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: dipankar@in.ibm.com
LKML-Reference: <20090414181715.GA3634@psychotron.englab.brq.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 13 insertions, 11 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4c38bc8049c..886df41e7452 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -77,6 +77,7 @@ struct sched_param {
 #include <linux/proportions.h>
 #include <linux/seccomp.h>
 #include <linux/rcupdate.h>
+#include <linux/rculist.h>
 #include <linux/rtmutex.h>
 
 #include <linux/time.h>
@@ -2010,7 +2011,8 @@ static inline unsigned long wait_task_inactive(struct task_struct *p,
 }
 #endif
 
-#define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
+#define next_task(p) \
+        list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
 
 #define for_each_process(p) \
         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
@@ -2049,8 +2051,8 @@ int same_thread_group(struct task_struct *p1, struct task_struct *p2)
 
 static inline struct task_struct *next_thread(const struct task_struct *p)
 {
-        return list_entry(rcu_dereference(p->thread_group.next),
-                          struct task_struct, thread_group);
+        return list_entry_rcu(p->thread_group.next,
+                              struct task_struct, thread_group);
 }
 
 static inline int thread_group_empty(struct task_struct *p)
diff --git a/ipc/sem.c b/ipc/sem.c
index 16a2189e96f9..87c2b641fd7b 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1290,8 +1290,8 @@ void exit_sem(struct task_struct *tsk)
                 int i;
 
                 rcu_read_lock();
-                un = list_entry(rcu_dereference(ulp->list_proc.next),
-                                        struct sem_undo, list_proc);
+                un = list_entry_rcu(ulp->list_proc.next,
+                                    struct sem_undo, list_proc);
                 if (&un->list_proc == &ulp->list_proc)
                         semid = -1;
                  else
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index ffbe259700b1..510186f0b72e 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -84,8 +84,8 @@ static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
          * against concurrent list-extension
          */
         rcu_read_lock();
-        qe = list_entry(rcu_dereference(qe->later.next),
-                        struct ima_queue_entry, later);
+        qe = list_entry_rcu(qe->later.next,
+                            struct ima_queue_entry, later);
         rcu_read_unlock();
         (*pos)++;
 
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index e03a7e19c73b..11d2cb19d7a6 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -734,8 +734,8 @@ static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
                 return;
         }
 
-        m = list_entry(rcu_dereference(smk_netlbladdr_list.next),
-                         struct smk_netlbladdr, list);
+        m = list_entry_rcu(smk_netlbladdr_list.next,
+                           struct smk_netlbladdr, list);
 
         /* the comparison '>' is a bit hacky, but works */
         if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
@@ -748,8 +748,8 @@ static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
                         list_add_rcu(&new->list, &m->list);
                         return;
                 }
-                m_next = list_entry(rcu_dereference(m->list.next),
-                                 struct smk_netlbladdr, list);
+                m_next = list_entry_rcu(m->list.next,
+                                        struct smk_netlbladdr, list);
                 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
                         list_add_rcu(&new->list, &m->list);
                         return;