mn10300: convert to generic kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 19 insertions, 36 deletions

diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 5cfb086b3903..ddbdc33471a8 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -8,6 +8,7 @@ config MN10300
         select HAVE_ARCH_KGDB
         select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
         select GENERIC_CLOCKEVENTS
+        select GENERIC_KERNEL_THREAD
 
 config AM33_2
         def_bool n
diff --git a/arch/mn10300/include/asm/processor.h b/arch/mn10300/include/asm/processor.h
index 0b844a254067..8b80b19d0c8a 100644
--- a/arch/mn10300/include/asm/processor.h
+++ b/arch/mn10300/include/asm/processor.h
@@ -133,11 +133,6 @@ static inline void start_thread(struct pt_regs *regs,
 extern void release_thread(struct task_struct *);
 
 /*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
-/*
  * Return saved PC of a blocked thread.
  */
 extern unsigned long thread_saved_pc(struct task_struct *tsk);
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 49af5ca89343..8ee09d828c43 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -162,24 +162,6 @@ void show_regs(struct pt_regs *regs)
 }
 
 /*
- * create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-        struct pt_regs regs = {
-                .a0 = (unsigned long) fn;
-                .d0 = (unsigned long) arg;
-        };
-
-        local_save_flags(regs.epsw);
-        regs.epsw |= EPSW_IE | EPSW_IM_7;
-
-        /* 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)
@@ -232,29 +214,34 @@ int copy_thread(unsigned long clone_flags,
         /* allocate the userspace exception frame and set it up */
         c_ksp -= sizeof(struct pt_regs);
         c_regs = (struct pt_regs *) c_ksp;
+        c_ksp -= 12; /* allocate function call ABI slack */
 
+        /* set up things up so the scheduler can start the new task */
         p->thread.uregs = c_regs;
+        ti->frame       = c_regs;
+        p->thread.a3    = (unsigned long) c_regs;
+        p->thread.sp    = c_ksp;
+        p->thread.wchan = p->thread.pc;
+        p->thread.usp   = c_usp;
+
+        if (unlikely(!kregs)) {
+                memset(c_regs, 0, sizeof(struct pt_regs));
+                c_regs->a0 = c_usp; /* function */
+                c_regs->d0 = ustk_size; /* argument */
+                local_save_flags(c_regs->epsw);
+                c_regs->epsw |= EPSW_IE | EPSW_IM_7;
+                p->thread.pc    = (unsigned long) ret_from_kernel_thread;
+                return 0;
+        }
         *c_regs = *kregs;
         c_regs->sp = c_usp;
         c_regs->epsw &= ~EPSW_FE; /* my FPU */
 
-        c_ksp -= 12; /* allocate function call ABI slack */
-
         /* the new TLS pointer is passed in as arg #5 to sys_clone() */
         if (clone_flags & CLONE_SETTLS)
                 c_regs->e2 = current_frame()->d3;
 
-        if (unlikely(!user_mode(kregs)))
-                p->thread.pc    = (unsigned long) ret_from_kernel_thread;
-        else
-                p->thread.pc    = (unsigned long) ret_from_fork;
-
-        /* set up things up so the scheduler can start the new task */
-        ti->frame       = c_regs;
-        p->thread.a3    = (unsigned long) c_regs;
-        p->thread.sp    = c_ksp;
-        p->thread.wchan = p->thread.pc;
-        p->thread.usp   = c_usp;
+        p->thread.pc    = (unsigned long) ret_from_fork;
 
         return 0;
 }