[PATCH] remove gcc-2 checks
[linux-2.6.git] / ipc / sem.c
index 5ad7ac0..cb5bb2a 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -73,6 +73,7 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
+#include <linux/seq_file.h>
 #include <asm/uaccess.h>
 #include "util.h"
 
@@ -89,7 +90,7 @@ static struct ipc_ids sem_ids;
 static int newary (key_t, int, int);
 static void freeary (struct sem_array *sma, int id);
 #ifdef CONFIG_PROC_FS
-static int sysvipc_sem_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data);
+static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
 #endif
 
 #define SEMMSL_FAST    256 /* 512 bytes on stack */
@@ -116,10 +117,10 @@ void __init sem_init (void)
 {
        used_sems = 0;
        ipc_init_ids(&sem_ids,sc_semmni);
-
-#ifdef CONFIG_PROC_FS
-       create_proc_read_entry("sysvipc/sem", 0, NULL, sysvipc_sem_read_proc, NULL);
-#endif
+       ipc_init_proc_interface("sysvipc/sem",
+                               "       key      semid perms      nsems   uid   gid  cuid  cgid      otime      ctime\n",
+                               &sem_ids,
+                               sysvipc_sem_proc_show);
 }
 
 /*
@@ -193,6 +194,7 @@ static int newary (key_t key, int nsems, int semflg)
        }
        used_sems += nsems;
 
+       sma->sem_id = sem_buildid(id, sma->sem_perm.seq);
        sma->sem_base = (struct sem *) &sma[1];
        /* sma->sem_pending = NULL; */
        sma->sem_pending_last = &sma->sem_pending;
@@ -201,7 +203,7 @@ static int newary (key_t key, int nsems, int semflg)
        sma->sem_ctime = get_seconds();
        sem_unlock(sma);
 
-       return sem_buildid(id, sma->sem_perm.seq);
+       return sma->sem_id;
 }
 
 asmlinkage long sys_semget (key_t key, int nsems, int semflg)
@@ -379,6 +381,7 @@ static void update_queue (struct sem_array * sma)
                        /* hands-off: q will disappear immediately after
                         * writing q->status.
                         */
+                       smp_wmb();
                        q->status = error;
                        q = n;
                } else {
@@ -459,6 +462,7 @@ static void freeary (struct sem_array *sma, int id)
                n = q->next;
                q->status = IN_WAKEUP;
                wake_up_process(q->sleeper); /* doesn't sleep */
+               smp_wmb();
                q->status = -EIDRM;     /* hands-off q */
                q = n;
        }
@@ -895,7 +899,7 @@ static inline void lock_semundo(void)
        struct sem_undo_list *undo_list;
 
        undo_list = current->sysvsem.undo_list;
-       if ((undo_list != NULL) && (atomic_read(&undo_list->refcnt) != 1))
+       if (undo_list)
                spin_lock(&undo_list->lock);
 }
 
@@ -915,7 +919,7 @@ static inline void unlock_semundo(void)
        struct sem_undo_list *undo_list;
 
        undo_list = current->sysvsem.undo_list;
-       if ((undo_list != NULL) && (atomic_read(&undo_list->refcnt) != 1))
+       if (undo_list)
                spin_unlock(&undo_list->lock);
 }
 
@@ -943,9 +947,7 @@ static inline int get_undo_list(struct sem_undo_list **undo_listp)
                if (undo_list == NULL)
                        return -ENOMEM;
                memset(undo_list, 0, size);
-               /* don't initialize unodhd->lock here.  It's done
-                * in copy_semundo() instead.
-                */
+               spin_lock_init(&undo_list->lock);
                atomic_set(&undo_list->refcnt, 1);
                current->sysvsem.undo_list = undo_list;
        }
@@ -1054,7 +1056,7 @@ asmlinkage long sys_semtimedop(int semid, struct sembuf __user *tsops,
        struct sembuf fast_sops[SEMOPM_FAST];
        struct sembuf* sops = fast_sops, *sop;
        struct sem_undo *un;
-       int undos = 0, decrease = 0, alter = 0, max;
+       int undos = 0, alter = 0, max;
        struct sem_queue queue;
        unsigned long jiffies_left = 0;
 
@@ -1089,13 +1091,10 @@ asmlinkage long sys_semtimedop(int semid, struct sembuf __user *tsops,
                if (sop->sem_num >= max)
                        max = sop->sem_num;
                if (sop->sem_flg & SEM_UNDO)
-                       undos++;
-               if (sop->sem_op < 0)
-                       decrease = 1;
-               if (sop->sem_op > 0)
+                       undos = 1;
+               if (sop->sem_op != 0)
                        alter = 1;
        }
-       alter |= decrease;
 
 retry_undos:
        if (undos) {
@@ -1234,8 +1233,6 @@ int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
                error = get_undo_list(&undo_list);
                if (error)
                        return error;
-               if (atomic_read(&undo_list->refcnt) == 1)
-                       spin_lock_init(&undo_list->lock);
                atomic_inc(&undo_list->refcnt);
                tsk->sysvsem.undo_list = undo_list;
        } else 
@@ -1335,50 +1332,21 @@ next_entry:
 }
 
 #ifdef CONFIG_PROC_FS
-static int sysvipc_sem_read_proc(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+static int sysvipc_sem_proc_show(struct seq_file *s, void *it)
 {
-       off_t pos = 0;
-       off_t begin = 0;
-       int i, len = 0;
-
-       len += sprintf(buffer, "       key      semid perms      nsems   uid   gid  cuid  cgid      otime      ctime\n");
-       down(&sem_ids.sem);
-
-       for(i = 0; i <= sem_ids.max_id; i++) {
-               struct sem_array *sma;
-               sma = sem_lock(i);
-               if(sma) {
-                       len += sprintf(buffer + len, "%10d %10d  %4o %10lu %5u %5u %5u %5u %10lu %10lu\n",
-                               sma->sem_perm.key,
-                               sem_buildid(i,sma->sem_perm.seq),
-                               sma->sem_perm.mode,
-                               sma->sem_nsems,
-                               sma->sem_perm.uid,
-                               sma->sem_perm.gid,
-                               sma->sem_perm.cuid,
-                               sma->sem_perm.cgid,
-                               sma->sem_otime,
-                               sma->sem_ctime);
-                       sem_unlock(sma);
-
-                       pos += len;
-                       if(pos < offset) {
-                               len = 0;
-                               begin = pos;
-                       }
-                       if(pos > offset + length)
-                               goto done;
-               }
-       }
-       *eof = 1;
-done:
-       up(&sem_ids.sem);
-       *start = buffer + (offset - begin);
-       len -= (offset - begin);
-       if(len > length)
-               len = length;
-       if(len < 0)
-               len = 0;
-       return len;
+       struct sem_array *sma = it;
+
+       return seq_printf(s,
+                         "%10d %10d  %4o %10lu %5u %5u %5u %5u %10lu %10lu\n",
+                         sma->sem_perm.key,
+                         sma->sem_id,
+                         sma->sem_perm.mode,
+                         sma->sem_nsems,
+                         sma->sem_perm.uid,
+                         sma->sem_perm.gid,
+                         sma->sem_perm.cuid,
+                         sma->sem_perm.cgid,
+                         sma->sem_otime,
+                         sma->sem_ctime);
 }
 #endif