ia64: Rename ia64_invoke_kernel_thread_helper() to start_kernel_thread()

	for symmetry with start_kernel() and to make it obvious when the
	end of the call-chain has been reached.

arch/ia64/kernel/head.S

@@ -816,7 +816,7 @@ GLOBAL_ENTRY(ia64_delay_loop)
 	br.ret.sptk.many rp
 END(ia64_delay_loop)
 
-GLOBAL_ENTRY(ia64_invoke_kernel_thread_helper)
+GLOBAL_ENTRY(start_kernel_thread)
 	.prologue
 	.save rp, r0				// this is the end of the call-chain
 	.body
@@ -827,7 +827,7 @@ GLOBAL_ENTRY(ia64_invoke_kernel_thread_helper)
 	mov out0 = r8
 	br.call.sptk.many rp = sys_exit;;
 1:	br.sptk.few 1b				// not reached
-END(ia64_invoke_kernel_thread_helper)
+END(start_kernel_thread)
 
 #ifdef CONFIG_IA64_BRL_EMU
 

arch/ia64/kernel/process.c

@@ -574,8 +574,8 @@ ia64_set_personality (struct elf64_hdr *elf_ex, int ibcs2_interpreter)
 pid_t
 kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)
 {
-	extern void ia64_invoke_kernel_thread_helper (void);
-	unsigned long *helper_fptr = (unsigned long *) &ia64_invoke_kernel_thread_helper;
+	extern void start_kernel_thread (void);
+	unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread;
 	struct {
 		struct switch_stack sw;
 		struct pt_regs pt;