1 files changed, 17 insertions, 109 deletions

diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index e7366276ef30..765d0f57c787 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -165,41 +165,6 @@ void show_regs(struct pt_regs * regs)
 }
 
 /*
- * Create a kernel thread
- */
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be free'd until both the parent and the child have exited.
- */
-static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
-{
-        fn(arg);
-        do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-        struct pt_regs regs;
-
-        memset(&regs, 0, sizeof (regs));
-        regs.r1 = (unsigned long)fn;
-        regs.r2 = (unsigned long)arg;
-
-        regs.bpc = (unsigned long)kernel_thread_helper;
-
-        regs.psw = M32R_PSW_BIE;
-
-        /* Ok, create the new process. */
-        return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
-                NULL);
-}
-
-/*
  * Free current thread data structures etc..
  */
 void exit_thread(void)
@@ -227,88 +192,31 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long spu,
-        unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
+        unsigned long arg, struct task_struct *tsk)
 {
         struct pt_regs *childregs = task_pt_regs(tsk);
         extern void ret_from_fork(void);
-
-        /* Copy registers */
-        *childregs = *regs;
-
-        childregs->spu = spu;
-        childregs->r0 = 0;      /* Child gets zero as return value */
-        regs->r0 = tsk->pid;
+        extern void ret_from_kernel_thread(void);
+
+        if (unlikely(tsk->flags & PF_KTHREAD)) {
+                memset(childregs, 0, sizeof(struct pt_regs));
+                childregs->psw = M32R_PSW_BIE;
+                childregs->r1 = spu;    /* fn */
+                childregs->r0 = arg;
+                tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
+        } else {
+                /* Copy registers */
+                *childregs = *current_pt_regs();
+                if (spu)
+                        childregs->spu = spu;
+                childregs->r0 = 0;      /* Child gets zero as return value */
+                tsk->thread.lr = (unsigned long)ret_from_fork;
+        }
         tsk->thread.sp = (unsigned long)childregs;
-        tsk->thread.lr = (unsigned long)ret_from_fork;
 
         return 0;
 }
 
-asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
-        unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
-        struct pt_regs regs)
-{
-#ifdef CONFIG_MMU
-        return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
-#else
-        return -EINVAL;
-#endif /* CONFIG_MMU */
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-                         unsigned long parent_tidptr,
-                         unsigned long child_tidptr,
-                         unsigned long r4, unsigned long r5, unsigned long r6,
-                         struct pt_regs regs)
-{
-        if (!newsp)
-                newsp = regs.spu;
-
-        return do_fork(clone_flags, newsp, &regs, 0,
-                       (int __user *)parent_tidptr, (int __user *)child_tidptr);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
-        unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
-        struct pt_regs regs)
-{
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
-                        NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *ufilename,
-                          const char __user *const __user *uargv,
-                          const char __user *const __user *uenvp,
-                          unsigned long r3, unsigned long r4, unsigned long r5,
-                          unsigned long r6, struct pt_regs regs)
-{
-        int error;
-        struct filename *filename;
-
-        filename = getname(ufilename);
-        error = PTR_ERR(filename);
-        if (IS_ERR(filename))
-                goto out;
-
-        error = do_execve(filename->name, uargv, uenvp, &regs);
-        putname(filename);
-out:
-        return error;
-}
-
 /*
  * These bracket the sleeping functions..
  */