x86/asm/efi: Create a stack frame in efi_call()

efi_call() is a callable non-leaf function which doesn't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.

Create a stack frame for it when CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Josh Poimboeuf <[e-mail]>
Reviewed-by: Matt Fleming <[e-mail]>
Reviewed-by: Borislav Petkov <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Bernd Petrovitsch <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Brian Gerst <[e-mail]>
Cc: Chris J Arges <[e-mail]>
Cc: Denys Vlasenko <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Jiri Slaby <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Michal Marek <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Pedro Alves <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/platform/efi/efi_stub_64.S

···
 #include <asm/msr.h>
 #include <asm/processor-flags.h>
 #include <asm/page_types.h>
+#include <asm/frame.h>
 
 #define SAVE_XMM			\
 	mov %rsp, %rax;			\
···
 	.endm
 
 ENTRY(efi_call)
+	FRAME_BEGIN
 	SAVE_XMM
 	mov (%rsp), %rax
 	mov 8(%rax), %rax
···
 	RESTORE_PGT
 	addq $48, %rsp
 	RESTORE_XMM
+	FRAME_END
 	ret
 ENDPROC(efi_call)