x86/asm/entry/64: Remove stub_iopl

stub_iopl is no longer needed: pt_regs->flags needs no fixing up
after previous change. Remove it.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1425984307-2143-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/entry_64.S

@@ -421,22 +421,9 @@ ENTRY(stub_\func)
 END(stub_\func)
 	.endm
 
-	.macro FIXED_FRAME label,func
-ENTRY(\label)
-	CFI_STARTPROC
-	DEFAULT_FRAME 0, 8		/* offset 8: return address */
-	FIXUP_TOP_OF_STACK %r11, 8
-	call \func
-	RESTORE_TOP_OF_STACK %r11, 8
-	ret
-	CFI_ENDPROC
-END(\label)
-	.endm
-
 	FORK_LIKE  clone
 	FORK_LIKE  fork
 	FORK_LIKE  vfork
-	FIXED_FRAME stub_iopl, sys_iopl
 
 ENTRY(stub_execve)
 	CFI_STARTPROC

arch/x86/syscalls/syscall_64.tbl

@@ -178,7 +178,7 @@
 169	common	reboot			sys_reboot
 170	common	sethostname		sys_sethostname
 171	common	setdomainname		sys_setdomainname
-172	common	iopl			stub_iopl
+172	common	iopl			sys_iopl
 173	common	ioperm			sys_ioperm
 174	64	create_module
 175	common	init_module		sys_init_module

arch/x86/um/sys_call_table_64.c

@@ -16,7 +16,7 @@
  */
 
 /* Not going to be implemented by UML, since we have no hardware. */
-#define stub_iopl sys_ni_syscall
+#define sys_iopl sys_ni_syscall
 #define sys_ioperm sys_ni_syscall
 
 /*