[PATCH] s390: atomic primitives

      Hugh Dickins <hugh@veritas.com>

Fix the broken atomic_cmpxchg primitive.  Add atomic_sub_and_test,
atomic64_sub_return, atomic64_sub_and_test, atomic64_cmpxchg,
atomic64_add_unless and atomic64_inc_not_zero.  Replace old style
atomic_compare_and_swap by atomic_cmpxchg.  Shorten the whole header by
defining most primitives with the two inline functions atomic_add_return and
atomic_sub_return.

In addition this patch contains the s390 related fixes of Hugh's "mm: fill
arch atomic64 gaps" patch.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 22 insertions, 24 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 7008d32..6278739 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -7,7 +7,7 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
  *
- * $Revision: 1.167 $
+ * $Revision: 1.169 $
  */
 
 #include <linux/config.h>
@@ -1323,7 +1323,7 @@ void
 dasd_schedule_bh(struct dasd_device * device)
 {
 	/* Protect against rescheduling. */
-	if (atomic_compare_and_swap (0, 1, &device->tasklet_scheduled))
+	if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
 		return;
 	dasd_get_device(device);
 	tasklet_hi_schedule(&device->tasklet);
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
index 83f7577..56fa691 100644
--- a/drivers/s390/char/sclp_quiesce.c
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -32,7 +32,7 @@ do_load_quiesce_psw(void * __unused)
 	psw_t quiesce_psw;
 	int cpu;
 
-	if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
+	if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
 		signal_processor(smp_processor_id(), sigp_stop);
 	/* Wait for all other cpus to enter stopped state */
 	for_each_online_cpu(cpu) {
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 1efc9f2..482e07e 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -65,7 +65,7 @@ static void
 tapeblock_trigger_requeue(struct tape_device *device)
 {
 	/* Protect against rescheduling. */
-	if (atomic_compare_and_swap(0, 1, &device->blk_data.requeue_scheduled))
+	if (atomic_cmpxchg(&device->blk_data.requeue_scheduled, 0, 1) != 0)
 		return;
 	schedule_work(&device->blk_data.requeue_task);
 }
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index be9d2d6..e849289 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -1,7 +1,7 @@
 /*
  *  drivers/s390/cio/ccwgroup.c
  *  bus driver for ccwgroup
- *   $Revision: 1.32 $
+ *   $Revision: 1.33 $
  *
  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
  *                       IBM Corporation
@@ -263,7 +263,7 @@ ccwgroup_set_online(struct ccwgroup_device *gdev)
 	struct ccwgroup_driver *gdrv;
 	int ret;
 
-	if (atomic_compare_and_swap(0, 1, &gdev->onoff))
+	if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
 		return -EAGAIN;
 	if (gdev->state == CCWGROUP_ONLINE) {
 		ret = 0;
@@ -289,7 +289,7 @@ ccwgroup_set_offline(struct ccwgroup_device *gdev)
 	struct ccwgroup_driver *gdrv;
 	int ret;
 
-	if (atomic_compare_and_swap(0, 1, &gdev->onoff))
+	if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
 		return -EAGAIN;
 	if (gdev->state == CCWGROUP_OFFLINE) {
 		ret = 0;
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 85908ca..0590cff 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1,7 +1,7 @@
 /*
  *  drivers/s390/cio/device.c
  *  bus driver for ccw devices
- *   $Revision: 1.131 $
+ *   $Revision: 1.137 $
  *
  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
  *			 IBM Corporation
@@ -374,7 +374,7 @@ online_store (struct device *dev, struct device_attribute *attr, const char *buf
 	int i, force, ret;
 	char *tmp;
 
-	if (atomic_compare_and_swap(0, 1, &cdev->private->onoff))
+	if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
 		return -EAGAIN;
 
 	if (cdev->drv && !try_module_get(cdev->drv->owner)) {
diff --git a/drivers/s390/net/iucv.c b/drivers/s390/net/iucv.c
index df7647c..ecb2f8f 100644
--- a/drivers/s390/net/iucv.c
+++ b/drivers/s390/net/iucv.c
@@ -1,5 +1,5 @@
 /* 
- * $Id: iucv.c,v 1.45 2005/04/26 22:59:06 braunu Exp $
+ * $Id: iucv.c,v 1.47 2005/11/21 11:35:22 mschwide Exp $
  *
  * IUCV network driver
  *
@@ -29,7 +29,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
- * RELEASE-TAG: IUCV lowlevel driver $Revision: 1.45 $
+ * RELEASE-TAG: IUCV lowlevel driver $Revision: 1.47 $
  *
  */
 
@@ -355,7 +355,7 @@ do { \
 static void
 iucv_banner(void)
 {
-	char vbuf[] = "$Revision: 1.45 $";
+	char vbuf[] = "$Revision: 1.47 $";
 	char *version = vbuf;
 
 	if ((version = strchr(version, ':'))) {
@@ -477,7 +477,7 @@ grab_param(void)
 		ptr++;
 		if (ptr >= iucv_param_pool + PARAM_POOL_SIZE)
 			ptr = iucv_param_pool;
-	} while (atomic_compare_and_swap(0, 1, &ptr->in_use));
+	} while (atomic_cmpxchg(&ptr->in_use, 0, 1) != 0);
 	hint = ptr - iucv_param_pool;
 
 	memset(&ptr->param, 0, sizeof(ptr->param));
diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index f8f55cc..7b2663f 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -1396,7 +1396,7 @@ qeth_idx_activate_get_answer(struct qeth_channel *channel,
 	channel->ccw.cda = (__u32) __pa(iob->data);
 
 	wait_event(card->wait_q,
-		   atomic_compare_and_swap(0,1,&channel->irq_pending) == 0);
+		   atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0);
 	QETH_DBF_TEXT(setup, 6, "noirqpnd");
 	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 	rc = ccw_device_start(channel->ccwdev,
@@ -1463,7 +1463,7 @@ qeth_idx_activate_channel(struct qeth_channel *channel,
 	memcpy(QETH_IDX_ACT_QDIO_DEV_REALADDR(iob->data), &temp, 2);
 
 	wait_event(card->wait_q,
-		   atomic_compare_and_swap(0,1,&channel->irq_pending) == 0);
+		   atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0);
 	QETH_DBF_TEXT(setup, 6, "noirqpnd");
 	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 	rc = ccw_device_start(channel->ccwdev,
@@ -1616,7 +1616,7 @@ qeth_issue_next_read(struct qeth_card *card)
 	}
 	qeth_setup_ccw(&card->read, iob->data, QETH_BUFSIZE);
 	wait_event(card->wait_q,
-		   atomic_compare_and_swap(0,1,&card->read.irq_pending) == 0);
+		   atomic_cmpxchg(&card->read.irq_pending, 0, 1) == 0);
 	QETH_DBF_TEXT(trace, 6, "noirqpnd");
 	rc = ccw_device_start(card->read.ccwdev, &card->read.ccw,
 			      (addr_t) iob, 0, 0);
@@ -1882,7 +1882,7 @@ qeth_send_control_data(struct qeth_card *card, int len,
 	spin_unlock_irqrestore(&card->lock, flags);
 	QETH_DBF_HEX(control, 2, iob->data, QETH_DBF_CONTROL_LEN);
 	wait_event(card->wait_q,
-		   atomic_compare_and_swap(0,1,&card->write.irq_pending) == 0);
+		   atomic_cmpxchg(&card->write.irq_pending, 0, 1) == 0);
 	qeth_prepare_control_data(card, len, iob);
 	if (IS_IPA(iob->data))
 		timer.expires = jiffies + QETH_IPA_TIMEOUT;
@@ -1924,7 +1924,7 @@ qeth_osn_send_control_data(struct qeth_card *card, int len,
 	QETH_DBF_TEXT(trace, 5, "osndctrd");
 
 	wait_event(card->wait_q,
-		   atomic_compare_and_swap(0,1,&card->write.irq_pending) == 0);
+		   atomic_cmpxchg(&card->write.irq_pending, 0, 1) == 0);
 	qeth_prepare_control_data(card, len, iob);
 	QETH_DBF_TEXT(trace, 6, "osnoirqp");
 	spin_lock_irqsave(get_ccwdev_lock(card->write.ccwdev), flags);
@@ -4236,9 +4236,8 @@ qeth_do_send_packet_fast(struct qeth_card *card, struct qeth_qdio_out_q *queue,
 	QETH_DBF_TEXT(trace, 6, "dosndpfa");
 
 	/* spin until we get the queue ... */
-	while (atomic_compare_and_swap(QETH_OUT_Q_UNLOCKED,
-				       QETH_OUT_Q_LOCKED,
-				       &queue->state));
+	while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
+			      QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
 	/* ... now we've got the queue */
 	index = queue->next_buf_to_fill;
 	buffer = &queue->bufs[queue->next_buf_to_fill];
@@ -4292,9 +4291,8 @@ qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
 	QETH_DBF_TEXT(trace, 6, "dosndpkt");
 
 	/* spin until we get the queue ... */
-	while (atomic_compare_and_swap(QETH_OUT_Q_UNLOCKED,
-				       QETH_OUT_Q_LOCKED,
-				       &queue->state));
+	while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
+			      QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
 	start_index = queue->next_buf_to_fill;
 	buffer = &queue->bufs[queue->next_buf_to_fill];
 	/*