x86/compat: Rename 'start_thread_ia32' to 'compat_start_thread'

This function is shared between the 32-bit compat and x32 ABIs.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1434974121-32575-5-git-send-email-brgerst@gmail.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/elf.h

@@ -187,8 +187,8 @@ static inline void elf_common_init(struct thread_struct *t,
 #define	COMPAT_ELF_PLAT_INIT(regs, load_addr)		\
 	elf_common_init(&current->thread, regs, __USER_DS)
 
-void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
-#define compat_start_thread start_thread_ia32
+void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp);
+#define compat_start_thread compat_start_thread
 
 void set_personality_ia32(bool);
 #define COMPAT_SET_PERSONALITY(ex)			\

arch/x86/kernel/process_64.c

@@ -248,8 +248,8 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
 			    __USER_CS, __USER_DS, 0);
 }
 
-#ifdef CONFIG_IA32_EMULATION
-void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp)
+#ifdef CONFIG_COMPAT
+void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp)
 {
 	start_thread_common(regs, new_ip, new_sp,
 			    test_thread_flag(TIF_X32)