[GIT pull] x86 fixes for 4.13

[Thomas Gleixner]

Linus,

please pull the latest x86-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
x86-urgent-for-linus

A small set of x86 fixes:

  - Prevent the kernel from using the EFI reboot method when EFI is
    disabled.

  - Two patches addressing clang issues
  

Thanks,

        tglx

------------------>
Matthias Kaehlcke (1):
      x86/boot: Disable the address-of-packed-member compiler warning

Michael Davidson (1):
      x86/boot: #undef memcpy() et al in string.c

Stefan Assmann (1):
      x86/efi: Fix reboot_mode when EFI runtime services are disabled


 arch/x86/boot/compressed/Makefile | 1 +
 arch/x86/boot/string.c            | 9 +++++++++
 arch/x86/kernel/reboot.c          | 6 +++---
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/compressed/Makefile 
b/arch/x86/boot/compressed/Makefile
index 2c860ad4fe06..8a958274b54c 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -34,6 +34,7 @@ KBUILD_CFLAGS += $(cflags-y)
 KBUILD_CFLAGS += -mno-mmx -mno-sse
 KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
+KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 
 KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
 GCOV_PROFILE := n
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index 630e3664906b..16f49123d747 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -16,6 +16,15 @@
 #include "ctype.h"
 #include "string.h"
 
+/*
+ * Undef these macros so that the functions that we provide
+ * here will have the correct names regardless of how string.h
+ * may have chosen to #define them.
+ */
+#undef memcpy
+#undef memset
+#undef memcmp
+
 int memcmp(const void *s1, const void *s2, size_t len)
 {
        bool diff;
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 67393fc88353..a56bf6051f4e 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -471,12 +471,12 @@ static int __init reboot_init(void)
 
        /*
         * The DMI quirks table takes precedence. If no quirks entry
-        * matches and the ACPI Hardware Reduced bit is set, force EFI
-        * reboot.
+        * matches and the ACPI Hardware Reduced bit is set and EFI
+        * runtime services are enabled, force EFI reboot.
         */
        rv = dmi_check_system(reboot_dmi_table);
 
-       if (!rv && efi_reboot_required())
+       if (!rv && efi_reboot_required() && !efi_runtime_disabled())
                reboot_type = BOOT_EFI;
 
        return 0;