[PATCH] ia64 sn xpc: Convert to use kthread API.

[Eric W. Biederman]

From: Eric W. Biederman <ebiederm at xmission.com> - unquoted

This patch starts the xpc kernel threads using kthread_run
not a combination of kernel_thread and daemonize.  Resuling
in slightly simpler and more maintainable code.

Cc: Jes Sorensen <jes at sgi.com>
Cc: Tony Luck <tony.luck at intel.com>
Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 arch/ia64/sn/kernel/xpc_main.c |   31 +++++++++++++------------------
 1 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index e336e16..5b53642 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -56,6 +56,7 @@
 #include <linux/reboot.h>
 #include <linux/completion.h>
 #include <linux/kdebug.h>
+#include <linux/kthread.h>
 #include <asm/sn/intr.h>
 #include <asm/sn/sn_sal.h>
 #include <asm/uaccess.h>
@@ -253,8 +254,6 @@ xpc_hb_checker(void *ignore)
 
 	/* this thread was marked active by xpc_hb_init() */
 
-	daemonize(XPC_HB_CHECK_THREAD_NAME);
-
 	set_cpus_allowed(current, cpumask_of_cpu(XPC_HB_CHECK_CPU));
 
 	xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
@@ -324,8 +323,6 @@ xpc_hb_checker(void *ignore)
 static int
 xpc_initiate_discovery(void *ignore)
 {
-	daemonize(XPC_DISCOVERY_THREAD_NAME);
-
 	xpc_discovery();
 
 	dev_dbg(xpc_part, "discovery thread is exiting\n");
@@ -494,8 +491,6 @@ xpc_activating(void *__partid)
 
 	dev_dbg(xpc_part, "bringing partition %d up\n", partid);
 
-	daemonize("xpc%02d", partid);
-
 	/*
 	 * This thread needs to run at a realtime priority to prevent a
 	 * significant performance degradation.
@@ -559,7 +554,7 @@ xpc_activate_partition(struct xpc_partition *part)
 {
 	partid_t partid = XPC_PARTID(part);
 	unsigned long irq_flags;
-	pid_t pid;
+	struct task_struct *task;
 
 
 	spin_lock_irqsave(&part->act_lock, irq_flags);
@@ -571,9 +566,10 @@ xpc_activate_partition(struct xpc_partition *part)
 
 	spin_unlock_irqrestore(&part->act_lock, irq_flags);
 
-	pid = kernel_thread(xpc_activating, (void *) ((u64) partid), 0);
+	task = kthread_run(xpc_activating, (void *) ((u64) partid),
+			  "xpc%02d", partid);
 
-	if (unlikely(pid <= 0)) {
+	if (unlikely(IS_ERR(task))) {
 		spin_lock_irqsave(&part->act_lock, irq_flags);
 		part->act_state = XPC_P_INACTIVE;
 		XPC_SET_REASON(part, xpcCloneKThreadFailed, __LINE__);
@@ -724,8 +720,6 @@ xpc_daemonize_kthread(void *args)
 	unsigned long irq_flags;
 
 
-	daemonize("xpc%02dc%d", partid, ch_number);
-
 	dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
 		partid, ch_number);
 
@@ -844,8 +838,9 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed,
 		(void) xpc_part_ref(part);
 		xpc_msgqueue_ref(ch);
 
-		pid = kernel_thread(xpc_daemonize_kthread, (void *) args, 0);
-		if (pid < 0) {
+		task = kthread_run(xpc_daemonize_kthread, args,
+				   "xpc%02dc%d", partid, ch_number);
+		if (IS_ERR(task)) {
 			/* the fork failed */
 
 			/*
@@ -1222,7 +1217,7 @@ xpc_init(void)
 	int ret;
 	partid_t partid;
 	struct xpc_partition *part;
-	pid_t pid;
+	struct task_struct *task;
 	size_t buf_size;
 
 
@@ -1353,8 +1348,8 @@ xpc_init(void)
 	 * The real work-horse behind xpc.  This processes incoming
 	 * interrupts and monitors remote heartbeats.
 	 */
-	pid = kernel_thread(xpc_hb_checker, NULL, 0);
-	if (pid < 0) {
+	task = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
+	if (IS_ERR(task)) {
 		dev_err(xpc_part, "failed while forking hb check thread\n");
 
 		/* indicate to others that our reserved page is uninitialized */
@@ -1384,8 +1379,8 @@ xpc_init(void)
 	 * activate based on info provided by SAL. This new thread is short
 	 * lived and will exit once discovery is complete.
 	 */
-	pid = kernel_thread(xpc_initiate_discovery, NULL, 0);
-	if (pid < 0) {
+	task = kthread_run(xpc_initiate_discovery, NULL, XPC_DISCOVERY_THREAD_NAME);
+	if (IS_ERR(task)) {
 		dev_err(xpc_part, "failed while forking discovery thread\n");
 
 		/* mark this new thread as a non-starter */
-- 
1.5.0.g53756