c6x: switch to generic kernel_thread()

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

3 files changed, 6 insertions, 21 deletions

diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 983c859e40b..45268b50c0c 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -17,6 +17,7 @@ config C6X
         select OF
         select OF_EARLY_FLATTREE
         select GENERIC_CLOCKEVENTS
+        select GENERIC_KERNEL_THREAD
 
 config MMU
         def_bool n
diff --git a/arch/c6x/include/asm/processor.h b/arch/c6x/include/asm/processor.h
index c50af7ef1c9..b9eb3da7f27 100644
--- a/arch/c6x/include/asm/processor.h
+++ b/arch/c6x/include/asm/processor.h
@@ -92,8 +92,6 @@ static inline void release_thread(struct task_struct *dead_task)
 {
 }
 
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
 #define copy_segments(tsk, mm)          do { } while (0)
 #define release_segments(mm)            do { } while (0)
 
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index f98616d92f2..2770d9a9a84 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -104,22 +104,6 @@ void machine_power_off(void)
         halt_loop();
 }
 
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-        struct pt_regs regs = {
-                .a0 = (unsigned long)fn,
-                .a1 = (unsigned long)arg,
-                .tsr = 0, /* kernel mode */
-        };
-
-        /* Ok, create the new process.. */
-        return do_fork(flags | CLONE_VM | CLONE_UNTRACED, -1, &regs,
-                       0, NULL, NULL);
-}
-
 void flush_thread(void)
 {
 }
@@ -177,14 +161,16 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 
         childregs = task_pt_regs(p);
 
-        *childregs = *regs;
-
-        if (usp == -1) {
+        if (!regs) {
                 /* case of  __kernel_thread: we return to supervisor space */
+                memset(childregs, 0, sizeof(struct pt_regs));
                 childregs->sp = (unsigned long)(childregs + 1);
                 p->thread.pc = (unsigned long) ret_from_kernel_thread;
+                childregs->a0 = usp;            /* function */
+                childregs->a1 = ustk_size;      /* argument */
         } else {
                 /* Otherwise use the given stack */
+                *childregs = *regs;
                 childregs->sp = usp;
                 p->thread.pc = (unsigned long) ret_from_fork;
         }