patch-2_6_7-vs1_9_1_12

[linux-2.6.git] / arch / parisc / kernel / process.c

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index b6ae7c4..f04dea6 100644 (file)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -44,6 +44,7 @@
 #include <linux/sched.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>
+#include <linux/kallsyms.h>
 
 #include <asm/io.h>
 #include <asm/offsets.h>
@@ -51,6 +52,7 @@
 #include <asm/pdc_chassis.h>
 #include <asm/pgalloc.h>
 #include <asm/uaccess.h>
+#include <asm/unwind.h>
 
 int hlt_counter;
 
@@ -368,3 +370,28 @@ out:
 
        return error;
 }
+
+unsigned long 
+get_wchan(struct task_struct *p)
+{
+       struct unwind_frame_info info;
+       unsigned long ip;
+       int count = 0;
+       /*
+        * These bracket the sleeping functions..
+        */
+#      define first_sched      ((unsigned long) scheduling_functions_start_here)
+#      define last_sched       ((unsigned long) scheduling_functions_end_here)
+
+       unwind_frame_init_from_blocked_task(&info, p);
+       do {
+               if (unwind_once(&info) < 0)
+                       return 0;
+               ip = info.ip;
+               if (ip < first_sched || ip >= last_sched)
+                       return ip;
+       } while (count++ < 16);
+       return 0;
+#      undef first_sched
+#      undef last_sched
+}