From 03ba4131783cc9e872f8bb26a03f15bc11f27564 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Sat, 19 Sep 1998 19:15:08 +0000
Subject:  - Merge with Linux 2.1.121.  - Bugfixes.

---
 ipc/sem.c  | 10 +++++-----
 ipc/shm.c  | 38 +++++++++++++++++++++++++++++++++++++-
 ipc/util.c |  6 +++++-
 3 files changed, 47 insertions(+), 7 deletions(-)

(limited to 'ipc')

diff --git a/ipc/sem.c b/ipc/sem.c
index 0ab578584..655047cf2 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -56,7 +56,7 @@ static int max_semid = 0;
 
 static unsigned short sem_seq = 0;
 
-__initfunc(void sem_init (void))
+void __init sem_init (void)
 {
 	int i;
 
@@ -466,10 +466,10 @@ asmlinkage int sys_semctl (int semid, int semnum, int cmd, union semun arg)
 		if (ipcperms (ipcp, S_IRUGO))
 			goto out;
 		switch (cmd) {
-		case GETVAL : return curr->semval;
-		case GETPID : return curr->sempid;
-		case GETNCNT: return count_semncnt(sma,semnum);
-		case GETZCNT: return count_semzcnt(sma,semnum);
+		case GETVAL : err = curr->semval; goto out;
+		case GETPID : err = curr->sempid; goto out;
+		case GETNCNT: err = count_semncnt(sma,semnum); goto out;
+		case GETZCNT: err = count_semzcnt(sma,semnum); goto out;
 		case GETALL:
 			array = arg.array;
 			break;
diff --git a/ipc/shm.c b/ipc/shm.c
index c7568b784..0ec61b1e3 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -3,6 +3,7 @@
  * Copyright (C) 1992, 1993 Krishna Balasubramanian
  *         Many improvements/fixes by Bruno Haible.
  * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994.
+ * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli.
  */
 
 #include <linux/errno.h>
@@ -45,7 +46,7 @@ static ulong swap_attempts = 0;
 static ulong swap_successes = 0;
 static ulong used_segs = 0;
 
-__initfunc(void shm_init (void))
+void __init shm_init (void)
 {
 	int id;
 
@@ -837,3 +838,38 @@ int shm_swap (int prio, int gfp_mask)
 	shm_rss--;
 	return 1;
 }
+
+/*
+ * Free the swap entry and set the new pte for the shm page.
+ */
+static void shm_unuse_page(struct shmid_ds *shp, unsigned long idx,
+			   unsigned long page, unsigned long entry)
+{
+	pte_t pte;
+
+	pte = pte_mkdirty(mk_pte(page, PAGE_SHARED));
+	shp->shm_pages[idx] = pte_val(pte);
+	atomic_inc(&mem_map[MAP_NR(page)].count);
+	shm_rss++;
+
+	swap_free(entry);
+	shm_swp--;
+}
+
+/*
+ * unuse_shm() search for an eventually swapped out shm page.
+ */
+void shm_unuse(unsigned long entry, unsigned long page)
+{
+	int i, n;
+
+	for (i = 0; i < SHMMNI; i++)
+		if (shm_segs[i] != IPC_UNUSED && shm_segs[i] != IPC_NOID)
+			for (n = 0; n < shm_segs[i]->shm_npages; n++)
+				if (shm_segs[i]->shm_pages[n] == entry)
+				{
+					shm_unuse_page(shm_segs[i], n,
+						       page, entry);
+					return;
+				}
+}
diff --git a/ipc/util.c b/ipc/util.c
index c7933273a..7cb2f24dd 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -24,7 +24,7 @@
 
 extern void sem_init (void), msg_init (void), shm_init (void);
 
-__initfunc(void ipc_init (void))
+void __init ipc_init (void)
 {
 	sem_init();
 	msg_init();
@@ -125,4 +125,8 @@ asmlinkage int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf)
 	return -ENOSYS;
 }
 
+void shm_unuse(unsigned long entry, unsigned long page)
+{
+}
+
 #endif /* CONFIG_SYSVIPC */
-- 
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