powerpc/kernel: Rename copy_thread() 'arg' argument to 'kthread_arg'

The 'arg' argument to copy_thread() is only ever used when forking a new
kernel thread. Hence, rename it to 'kthread_arg' for clarity.

Signed-off-by: Alex Dowad <alexinbeijing@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index b4cc7bef6b16d88d8ba5a27d60d7df13d2f7e74a..febb50dd53285d8cbee941e5895bcbcb3bc77b8f 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1114,8 +1114,11 @@ static void setup_ksp_vsid(struct task_struct *p, unsigned long sp)
  */
 extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
 
+/*
+ * Copy architecture-specific thread state
+ */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-               unsigned long arg, struct task_struct *p)
+               unsigned long kthread_arg, struct task_struct *p)
 {
        struct pt_regs *childregs, *kregs;
        extern void ret_from_fork(void);
@@ -1127,6 +1130,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
        sp -= sizeof(struct pt_regs);
        childregs = (struct pt_regs *) sp;
        if (unlikely(p->flags & PF_KTHREAD)) {
+               /* kernel thread */
                struct thread_info *ti = (void *)task_stack_page(p);
                memset(childregs, 0, sizeof(struct pt_regs));
                childregs->gpr[1] = sp + sizeof(struct pt_regs);
@@ -1137,11 +1141,12 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
                clear_tsk_thread_flag(p, TIF_32BIT);
                childregs->softe = 1;
 #endif
-               childregs->gpr[15] = arg;
+               childregs->gpr[15] = kthread_arg;
                p->thread.regs = NULL;  /* no user register state */
                ti->flags |= _TIF_RESTOREALL;
                f = ret_from_kernel_thread;
        } else {
+               /* user thread */
                struct pt_regs *regs = current_pt_regs();
                CHECK_FULL_REGS(regs);
                *childregs = *regs;