sparc: switch to kernel_clone()

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Link: https://lore.kernel.org/r/20200819104655.436656-7-christian.brauner@ubuntu.com

arch/sparc/kernel/process.c

@@ -25,7 +25,7 @@ asmlinkage long sparc_fork(struct pt_regs *regs)
 		.stack		= regs->u_regs[UREG_FP],
 	};
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered
@@ -50,7 +50,7 @@ asmlinkage long sparc_vfork(struct pt_regs *regs)
 		.stack		= regs->u_regs[UREG_FP],
 	};
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered
@@ -96,7 +96,7 @@ asmlinkage long sparc_clone(struct pt_regs *regs)
 	else
 		args.stack = regs->u_regs[UREG_FP];
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered