[PATCH] sem2mutex: ipc, id.sem

Semaphore to mutex conversion.

The conversion was generated via scripts, and the result was validated
automatically via a script as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 65 insertions, 56 deletions

diff --git a/ipc/compat.c b/ipc/compat.c
index 1fe95f6659dd..a544dfbb082a 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -30,7 +30,7 @@
 #include <linux/slab.h>
 #include <linux/syscalls.h>
 
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
 #include "util.h"
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 85c52fd26bff..a3bb0c8201c7 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -25,6 +25,8 @@
 #include <linux/netlink.h>
 #include <linux/syscalls.h>
 #include <linux/signal.h>
+#include <linux/mutex.h>
+
 #include <net/sock.h>
 #include "util.h"
 
@@ -760,7 +762,7 @@ out_unlock:
  * The receiver accepts the message and returns without grabbing the queue
  * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers
  * are necessary. The same algorithm is used for sysv semaphores, see
- * ipc/sem.c fore more details.
+ * ipc/mutex.c fore more details.
  *
  * The same algorithm is used for senders.
  */
diff --git a/ipc/msg.c b/ipc/msg.c
index 7eec5ed32379..48a7f17a7236 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -28,6 +28,8 @@
 #include <linux/syscalls.h>
 #include <linux/audit.h>
 #include <linux/seq_file.h>
+#include <linux/mutex.h>
+
 #include <asm/current.h>
 #include <asm/uaccess.h>
 #include "util.h"
@@ -179,8 +181,8 @@ static void expunge_all(struct msg_queue* msq, int res)
  * removes the message queue from message queue ID 
  * array, and cleans up all the messages associated with this queue.
  *
- * msg_ids.sem and the spinlock for this message queue is hold
- * before freeque() is called. msg_ids.sem remains locked on exit.
+ * msg_ids.mutex and the spinlock for this message queue is hold
+ * before freeque() is called. msg_ids.mutex remains locked on exit.
  */
 static void freeque (struct msg_queue *msq, int id)
 {
@@ -208,7 +210,7 @@ asmlinkage long sys_msgget (key_t key, int msgflg)
         int id, ret = -EPERM;
         struct msg_queue *msq;
         
-        down(&msg_ids.sem);
+        mutex_lock(&msg_ids.mutex);
         if (key == IPC_PRIVATE) 
                 ret = newque(key, msgflg);
         else if ((id = ipc_findkey(&msg_ids, key)) == -1) { /* key not used */
@@ -231,7 +233,7 @@ asmlinkage long sys_msgget (key_t key, int msgflg)
                 }
                 msg_unlock(msq);
         }
-        up(&msg_ids.sem);
+        mutex_unlock(&msg_ids.mutex);
         return ret;
 }
 
@@ -361,7 +363,7 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
                 msginfo.msgmnb = msg_ctlmnb;
                 msginfo.msgssz = MSGSSZ;
                 msginfo.msgseg = MSGSEG;
-                down(&msg_ids.sem);
+                mutex_lock(&msg_ids.mutex);
                 if (cmd == MSG_INFO) {
                         msginfo.msgpool = msg_ids.in_use;
                         msginfo.msgmap = atomic_read(&msg_hdrs);
@@ -372,7 +374,7 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
                         msginfo.msgtql = MSGTQL;
                 }
                 max_id = msg_ids.max_id;
-                up(&msg_ids.sem);
+                mutex_unlock(&msg_ids.mutex);
                 if (copy_to_user (buf, &msginfo, sizeof(struct msginfo)))
                         return -EFAULT;
                 return (max_id < 0) ? 0: max_id;
@@ -435,7 +437,7 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
                 return  -EINVAL;
         }
 
-        down(&msg_ids.sem);
+        mutex_lock(&msg_ids.mutex);
         msq = msg_lock(msqid);
         err=-EINVAL;
         if (msq == NULL)
@@ -489,7 +491,7 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
         }
         err = 0;
 out_up:
-        up(&msg_ids.sem);
+        mutex_unlock(&msg_ids.mutex);
         return err;
 out_unlock_up:
         msg_unlock(msq);
diff --git a/ipc/sem.c b/ipc/sem.c
index 59696a840be1..48a54f66a246 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -75,6 +75,8 @@
 #include <linux/audit.h>
 #include <linux/capability.h>
 #include <linux/seq_file.h>
+#include <linux/mutex.h>
+
 #include <asm/uaccess.h>
 #include "util.h"
 
@@ -139,7 +141,7 @@ void __init sem_init (void)
  *      * if it's IN_WAKEUP, then it must wait until the value changes
  *      * if it's not -EINTR, then the operation was completed by
  *        update_queue. semtimedop can return queue.status without
- *        performing any operation on the semaphore array.
+ *        performing any operation on the sem array.
  *      * otherwise it must acquire the spinlock and check what's up.
  *
  * The two-stage algorithm is necessary to protect against the following
@@ -214,7 +216,7 @@ asmlinkage long sys_semget (key_t key, int nsems, int semflg)
 
         if (nsems < 0 || nsems > sc_semmsl)
                 return -EINVAL;
-        down(&sem_ids.sem);
+        mutex_lock(&sem_ids.mutex);
         
         if (key == IPC_PRIVATE) {
                 err = newary(key, nsems, semflg);
@@ -242,7 +244,7 @@ asmlinkage long sys_semget (key_t key, int nsems, int semflg)
                 sem_unlock(sma);
         }
 
-        up(&sem_ids.sem);
+        mutex_unlock(&sem_ids.mutex);
         return err;
 }
 
@@ -437,8 +439,8 @@ static int count_semzcnt (struct sem_array * sma, ushort semnum)
         return semzcnt;
 }
 
-/* Free a semaphore set. freeary() is called with sem_ids.sem down and
- * the spinlock for this semaphore set hold. sem_ids.sem remains locked
+/* Free a semaphore set. freeary() is called with sem_ids.mutex locked and
+ * the spinlock for this semaphore set hold. sem_ids.mutex remains locked
  * on exit.
  */
 static void freeary (struct sem_array *sma, int id)
@@ -525,7 +527,7 @@ static int semctl_nolock(int semid, int semnum, int cmd, int version, union semu
                 seminfo.semmnu = SEMMNU;
                 seminfo.semmap = SEMMAP;
                 seminfo.semume = SEMUME;
-                down(&sem_ids.sem);
+                mutex_lock(&sem_ids.mutex);
                 if (cmd == SEM_INFO) {
                         seminfo.semusz = sem_ids.in_use;
                         seminfo.semaem = used_sems;
@@ -534,7 +536,7 @@ static int semctl_nolock(int semid, int semnum, int cmd, int version, union semu
                         seminfo.semaem = SEMAEM;
                 }
                 max_id = sem_ids.max_id;
-                up(&sem_ids.sem);
+                mutex_unlock(&sem_ids.mutex);
                 if (copy_to_user (arg.__buf, &seminfo, sizeof(struct seminfo))) 
                         return -EFAULT;
                 return (max_id < 0) ? 0: max_id;
@@ -885,9 +887,9 @@ asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
                 return err;
         case IPC_RMID:
         case IPC_SET:
-                down(&sem_ids.sem);
+                mutex_lock(&sem_ids.mutex);
                 err = semctl_down(semid,semnum,cmd,version,arg);
-                up(&sem_ids.sem);
+                mutex_unlock(&sem_ids.mutex);
                 return err;
         default:
                 return -EINVAL;
@@ -1299,9 +1301,9 @@ found:
                 /* perform adjustments registered in u */
                 nsems = sma->sem_nsems;
                 for (i = 0; i < nsems; i++) {
-                        struct sem * sem = &sma->sem_base[i];
+                        struct sem * semaphore = &sma->sem_base[i];
                         if (u->semadj[i]) {
-                                sem->semval += u->semadj[i];
+                                semaphore->semval += u->semadj[i];
                                 /*
                                  * Range checks of the new semaphore value,
                                  * not defined by sus:
@@ -1315,11 +1317,11 @@ found:
                                  *
                                  *      Manfred <manfred@colorfullife.com>
                                  */
-                                if (sem->semval < 0)
-                                        sem->semval = 0;
-                                if (sem->semval > SEMVMX)
-                                        sem->semval = SEMVMX;
-                                sem->sempid = current->tgid;
+                                if (semaphore->semval < 0)
+                                        semaphore->semval = 0;
+                                if (semaphore->semval > SEMVMX)
+                                        semaphore->semval = SEMVMX;
+                                semaphore->sempid = current->tgid;
                         }
                 }
                 sma->sem_otime = get_seconds();
diff --git a/ipc/shm.c b/ipc/shm.c
index 6f9615c09fb2..f806a2e314e0 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -30,6 +30,7 @@
 #include <linux/capability.h>
 #include <linux/ptrace.h>
 #include <linux/seq_file.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 
@@ -109,7 +110,7 @@ static void shm_open (struct vm_area_struct *shmd)
  *
  * @shp: struct to free
  *
- * It has to be called with shp and shm_ids.sem locked,
+ * It has to be called with shp and shm_ids.mutex locked,
  * but returns with shp unlocked and freed.
  */
 static void shm_destroy (struct shmid_kernel *shp)
@@ -139,7 +140,7 @@ static void shm_close (struct vm_area_struct *shmd)
         int id = file->f_dentry->d_inode->i_ino;
         struct shmid_kernel *shp;
 
-        down (&shm_ids.sem);
+        mutex_lock(&shm_ids.mutex);
         /* remove from the list of attaches of the shm segment */
         if(!(shp = shm_lock(id)))
                 BUG();
@@ -151,7 +152,7 @@ static void shm_close (struct vm_area_struct *shmd)
                 shm_destroy (shp);
         else
                 shm_unlock(shp);
-        up (&shm_ids.sem);
+        mutex_unlock(&shm_ids.mutex);
 }
 
 static int shm_mmap(struct file * file, struct vm_area_struct * vma)
@@ -270,7 +271,7 @@ asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
         struct shmid_kernel *shp;
         int err, id = 0;
 
-        down(&shm_ids.sem);
+        mutex_lock(&shm_ids.mutex);
         if (key == IPC_PRIVATE) {
                 err = newseg(key, shmflg, size);
         } else if ((id = ipc_findkey(&shm_ids, key)) == -1) {
@@ -296,7 +297,7 @@ asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
                 }
                 shm_unlock(shp);
         }
-        up(&shm_ids.sem);
+        mutex_unlock(&shm_ids.mutex);
 
         return err;
 }
@@ -467,14 +468,14 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                         return err;
 
                 memset(&shm_info,0,sizeof(shm_info));
-                down(&shm_ids.sem);
+                mutex_lock(&shm_ids.mutex);
                 shm_info.used_ids = shm_ids.in_use;
                 shm_get_stat (&shm_info.shm_rss, &shm_info.shm_swp);
                 shm_info.shm_tot = shm_tot;
                 shm_info.swap_attempts = 0;
                 shm_info.swap_successes = 0;
                 err = shm_ids.max_id;
-                up(&shm_ids.sem);
+                mutex_unlock(&shm_ids.mutex);
                 if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
                         err = -EFAULT;
                         goto out;
@@ -583,7 +584,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                  *      Instead we set a destroyed flag, and then blow
                  *      the name away when the usage hits zero.
                  */
-                down(&shm_ids.sem);
+                mutex_lock(&shm_ids.mutex);
                 shp = shm_lock(shmid);
                 err = -EINVAL;
                 if (shp == NULL) 
@@ -610,7 +611,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                         shm_unlock(shp);
                 } else
                         shm_destroy (shp);
-                up(&shm_ids.sem);
+                mutex_unlock(&shm_ids.mutex);
                 goto out;
         }
 
@@ -620,12 +621,13 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                         err = -EFAULT;
                         goto out;
                 }
-                down(&shm_ids.sem);
+                mutex_lock(&shm_ids.mutex);
                 shp = shm_lock(shmid);
                 err=-EINVAL;
                 if(shp==NULL)
                         goto out_up;
-                if ((err = audit_ipc_perms(0, setbuf.uid, setbuf.gid, setbuf.mode, &(shp->shm_perm))))
+                if ((err = audit_ipc_perms(0, setbuf.uid, setbuf.gid,
+                                        setbuf.mode, &(shp->shm_perm))))
                         goto out_unlock_up;
                 err = shm_checkid(shp,shmid);
                 if(err)
@@ -658,7 +660,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
 out_unlock_up:
         shm_unlock(shp);
 out_up:
-        up(&shm_ids.sem);
+        mutex_unlock(&shm_ids.mutex);
         goto out;
 out_unlock:
         shm_unlock(shp);
@@ -771,7 +773,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
 invalid:
         up_write(&current->mm->mmap_sem);
 
-        down (&shm_ids.sem);
+        mutex_lock(&shm_ids.mutex);
         if(!(shp = shm_lock(shmid)))
                 BUG();
         shp->shm_nattch--;
@@ -780,7 +782,7 @@ invalid:
                 shm_destroy (shp);
         else
                 shm_unlock(shp);
-        up (&shm_ids.sem);
+        mutex_unlock(&shm_ids.mutex);
 
         *raddr = (unsigned long) user_addr;
         err = 0;
diff --git a/ipc/util.c b/ipc/util.c
index 862621980b01..23151ef32590 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -68,7 +68,8 @@ __initcall(ipc_init);
 void __init ipc_init_ids(struct ipc_ids* ids, int size)
 {
         int i;
-        sema_init(&ids->sem,1);
+
+        mutex_init(&ids->mutex);
 
         if(size > IPCMNI)
                 size = IPCMNI;
@@ -138,7 +139,7 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
  *      @ids: Identifier set
  *      @key: The key to find
  *      
- *      Requires ipc_ids.sem locked.
+ *      Requires ipc_ids.mutex locked.
  *      Returns the identifier if found or -1 if not.
  */
  
@@ -150,7 +151,7 @@ int ipc_findkey(struct ipc_ids* ids, key_t key)
 
         /*
          * rcu_dereference() is not needed here
-         * since ipc_ids.sem is held
+         * since ipc_ids.mutex is held
          */
         for (id = 0; id <= max_id; id++) {
                 p = ids->entries->p[id];
@@ -163,7 +164,7 @@ int ipc_findkey(struct ipc_ids* ids, key_t key)
 }
 
 /*
- * Requires ipc_ids.sem locked
+ * Requires ipc_ids.mutex locked
  */
 static int grow_ary(struct ipc_ids* ids, int newsize)
 {
@@ -210,7 +211,7 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
  *      is returned. The list is returned in a locked state on success.
  *      On failure the list is not locked and -1 is returned.
  *
- *      Called with ipc_ids.sem held.
+ *      Called with ipc_ids.mutex held.
  */
  
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
@@ -221,7 +222,7 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
 
         /*
          * rcu_dereference()() is not needed here since
-         * ipc_ids.sem is held
+         * ipc_ids.mutex is held
          */
         for (id = 0; id < size; id++) {
                 if(ids->entries->p[id] == NULL)
@@ -257,7 +258,7 @@ found:
  *      fed an invalid identifier. The entry is removed and internal
  *      variables recomputed. The object associated with the identifier
  *      is returned.
- *      ipc_ids.sem and the spinlock for this ID is hold before this function
+ *      ipc_ids.mutex and the spinlock for this ID is hold before this function
  *      is called, and remain locked on the exit.
  */
  
@@ -270,7 +271,7 @@ struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id)
 
         /* 
          * do not need a rcu_dereference()() here to force ordering
-         * on Alpha, since the ipc_ids.sem is held.
+         * on Alpha, since the ipc_ids.mutex is held.
          */     
         p = ids->entries->p[lid];
         ids->entries->p[lid] = NULL;
@@ -530,13 +531,13 @@ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
 
 /*
  * So far only shm_get_stat() calls ipc_get() via shm_get(), so ipc_get()
- * is called with shm_ids.sem locked.  Since grow_ary() is also called with
- * shm_ids.sem down(for Shared Memory), there is no need to add read 
+ * is called with shm_ids.mutex locked.  Since grow_ary() is also called with
+ * shm_ids.mutex down(for Shared Memory), there is no need to add read
  * barriers here to gurantee the writes in grow_ary() are seen in order 
  * here (for Alpha).
  *
- * However ipc_get() itself does not necessary require ipc_ids.sem down. So
- * if in the future ipc_get() is used by other places without ipc_ids.sem
+ * However ipc_get() itself does not necessary require ipc_ids.mutex down. So
+ * if in the future ipc_get() is used by other places without ipc_ids.mutex
  * down, then ipc_get() needs read memery barriers as ipc_lock() does.
  */
 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id)
@@ -667,7 +668,7 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
          * Take the lock - this will be released by the corresponding
          * call to stop().
          */
-        down(&iface->ids->sem);
+        mutex_lock(&iface->ids->mutex);
 
         /* pos < 0 is invalid */
         if (*pos < 0)
@@ -697,7 +698,7 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it)
                 ipc_unlock(ipc);
 
         /* Release the lock we took in start() */
-        up(&iface->ids->sem);
+        mutex_unlock(&iface->ids->mutex);
 }
 
 static int sysvipc_proc_show(struct seq_file *s, void *it)
diff --git a/ipc/util.h b/ipc/util.h
index efaff3ee7de7..0181553d31d8 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -25,7 +25,7 @@ struct ipc_ids {
         int max_id;
         unsigned short seq;
         unsigned short seq_max;
-        struct semaphore sem;   
+        struct mutex mutex;
         struct ipc_id_ary nullentry;
         struct ipc_id_ary* entries;
 };
@@ -40,7 +40,7 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
 #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
 #endif
 
-/* must be called with ids->sem acquired.*/
+/* must be called with ids->mutex acquired.*/
 int ipc_findkey(struct ipc_ids* ids, key_t key);
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);