[PARISC] be more defensive in process.c::get_wchan

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

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index e8dea4177113f8a63b1e92bb369b357b816ecebe..355664812b8319e1d0c9b01115fd4dbe162f8dc2 100644 (file)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -13,7 +13,7 @@
  *    Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
  *    Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
  *    Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
- *    Copyright (C) 2001-2002 Helge Deller <deller at parisc-linux.org>
+ *    Copyright (C) 2001-2007 Helge Deller <deller at parisc-linux.org>
  *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
  *
  *
@@ -54,11 +54,6 @@
 #include <asm/uaccess.h>
 #include <asm/unwind.h>
 
-void default_idle(void)
-{
-       barrier();
-}
-
 /*
  * The idle thread. There's no useful work to be
  * done, so just try to conserve power and have a
@@ -308,7 +303,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
                 * Copy function and argument to be called from
                 * ret_from_kernel_thread.
                 */
-#ifdef __LP64__
+#ifdef CONFIG_64BIT
                cregs->gr[27] = pregs->gr[27];
 #endif
                cregs->gr[26] = pregs->gr[26];
@@ -360,8 +355,8 @@ asmlinkage int sys_execve(struct pt_regs *regs)
        error = PTR_ERR(filename);
        if (IS_ERR(filename))
                goto out;
-       error = do_execve(filename, (char __user **) regs->gr[25],
-               (char __user **) regs->gr[24], regs);
+       error = do_execve(filename, (char __user * __user *) regs->gr[25],
+               (char __user * __user *) regs->gr[24], regs);
        if (error == 0) {
                task_lock(current);
                current->ptrace &= ~PT_DTRACE;
@@ -373,12 +368,23 @@ out:
        return error;
 }
 
-unsigned long 
+extern int __execve(const char *filename, char *const argv[],
+               char *const envp[], struct task_struct *task);
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+       return __execve(filename, argv, envp, current);
+}
+
+unsigned long
 get_wchan(struct task_struct *p)
 {
        struct unwind_frame_info info;
        unsigned long ip;
        int count = 0;
+
+       if (!p || p == current || p->state == TASK_RUNNING)
+               return 0;
+
        /*
         * These bracket the sleeping functions..
         */