From f969d69ba9f952e5bdd38278e25e26a3e4a61a70 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Sat, 29 Jan 2000 01:41:54 +0000
Subject: Merge with 2.3.27.

---
 arch/mips/kernel/process.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

(limited to 'arch/mips/kernel/process.c')

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index f0c346b61..959e7b339 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -1,4 +1,4 @@
-/* $Id: process.c,v 1.16 1999/10/09 00:00:58 ralf Exp $
+/* $Id: process.c,v 1.17 1999/12/04 03:59:00 ralf Exp $
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
@@ -186,3 +186,37 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 
 	return retval;
 }
+
+/*
+ * These bracket the sleeping functions..
+ */
+extern void scheduling_functions_start_here(void);
+extern void scheduling_functions_end_here(void);
+#define first_sched	((unsigned long) scheduling_functions_start_here)
+#define last_sched	((unsigned long) scheduling_functions_end_here)
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long schedule_frame;
+	unsigned long pc;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	pc = thread_saved_pc(&p->thread);
+	if (pc == (unsigned long) interruptible_sleep_on
+	    || pc == (unsigned long) sleep_on) {
+		schedule_frame = ((unsigned long *)p->thread.reg30)[9];
+		return ((unsigned long *)schedule_frame)[15];
+	}
+	if (pc == (unsigned long) interruptible_sleep_on_timeout
+	    || pc == (unsigned long) sleep_on_timeout) {
+		schedule_frame = ((unsigned long *)p->thread.reg30)[9];
+		return ((unsigned long *)schedule_frame)[16];
+	}
+	if (pc >= first_sched && pc < last_sched) {
+		printk(KERN_DEBUG "Bug in %s\n", __FUNCTION__);
+	}
+
+	return pc;
+}
-- 
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