Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull two x86 kernel build changes from Ingo Molnar:
 "The first change modifies how 'make oldconfig' works on cross-bitness
  situations on x86.  It was felt the new behavior of preserving the
  bitness of the .config is more logical.  This is a leftover of the
  merge.

  The second change eliminates a Perl warning.  (There's another, more
  complete fix resulting of this warning fix, which second fix in flight
  to you via the kbuild tree, which will remove the timeconst.pl script
  altogether.)"

* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timeconst.pl: Eliminate Perl warning
  x86: Default to ARCH=x86 to avoid overriding CONFIG_64BIT

3 files changed, 6 insertions, 1 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a9e50ac90838..5e05ee3a9810 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1,7 +1,7 @@
 # Select 32 or 64 bit
 config 64BIT
         bool "64-bit kernel" if ARCH = "x86"
-        default ARCH = "x86_64"
+        default ARCH != "i386"
         ---help---
           Say yes to build a 64-bit kernel - formerly known as x86_64
           Say no to build a 32-bit kernel - formerly known as i386
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index e71fc4279aab..5c477260294f 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -2,7 +2,11 @@
 
 # select defconfig based on actual architecture
 ifeq ($(ARCH),x86)
+  ifeq ($(shell uname -m),x86_64)
+        KBUILD_DEFCONFIG := x86_64_defconfig
+  else
         KBUILD_DEFCONFIG := i386_defconfig
+  endif
 else
         KBUILD_DEFCONFIG := $(ARCH)_defconfig
 endif
diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index 5598547281a7..94447086e551 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -1,3 +1,4 @@
+# CONFIG_64BIT is not set
 CONFIG_EXPERIMENTAL=y
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SYSVIPC=y