x86-64: Fix unwind annotations in syscall stubs

With the return address removed from the stack, these should
really refer to their caller's register state.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Alexander van Heukelum <heukelum@fastmail.fm>
LKML-Reference: <4C7FBA3D0200007800013F61@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/entry_64.S

@@ -714,9 +714,8 @@ END(ptregscall_common)
 
 ENTRY(stub_execve)
 	CFI_STARTPROC
-	popq %r11
-	CFI_ADJUST_CFA_OFFSET -8
-	CFI_REGISTER rip, r11
+	addq $8, %rsp
+	PARTIAL_FRAME 0
 	SAVE_REST
 	FIXUP_TOP_OF_STACK %r11
 	movq %rsp, %rcx
@@ -735,7 +734,7 @@ END(stub_execve)
 ENTRY(stub_rt_sigreturn)
 	CFI_STARTPROC
 	addq $8, %rsp
-	CFI_ADJUST_CFA_OFFSET	-8
+	PARTIAL_FRAME 0
 	SAVE_REST
 	movq %rsp,%rdi
 	FIXUP_TOP_OF_STACK %r11
@@ -1445,7 +1444,6 @@ error_swapgs:
 error_sti:
 	TRACE_IRQS_OFF
 	ret
-	CFI_ENDPROC
 
 /*
  * There are two places in the kernel that can potentially fault with
@@ -1470,6 +1468,7 @@ bstep_iret:
 	/* Fix truncated RIP */
 	movq %rcx,RIP+8(%rsp)
 	jmp error_swapgs
+	CFI_ENDPROC
 END(error_entry)