[tip:x86/urgent] x86-64, build: Fix stack protector Makefile breakage with 32-bit userland

[tip-bot for George Spelvin <tipbot@zytor.com>]

Commit-ID:  14262d67fe348018af368a07430fbc06eadeabb1
Gitweb:     http://git.kernel.org/tip/14262d67fe348018af368a07430fbc06eadeabb1
Author:     George Spelvin <linux@horizon.com>
AuthorDate: Wed, 7 May 2014 17:05:52 -0400
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Wed, 7 May 2014 14:14:44 -0700

x86-64, build: Fix stack protector Makefile breakage with 32-bit userland

If you are using a 64-bit kernel with 32-bit userland, then
scripts/gcc-x86_64-has-stack-protector.sh invokes 32-bit gcc
with -mcmodel=kernel, which produces:

<stdin>:1:0: error: code model 'kernel' not supported in the 32 bit mode

and trips the "broken compiler" test at arch/x86/Makefile:120.

There are several places a fix is possible, but the following seems
cleanest.  (But it's minimal; it would also be possible to factor
out a bunch of stuff from the two branches of the if.)

Signed-off-by: George Spelvin <linux@horizon.com>
Link: http://lkml.kernel.org/r/20140507210552.7581.qmail@ns.horizon.com
Cc: <stable@vger.kernel.org> # v3.14
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index ce6ad7e..33f71b0 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -79,6 +79,7 @@ else
         UTS_MACHINE := x86_64
         CHECKFLAGS += -D__x86_64__ -m64
 
+        biarch := -m64
         KBUILD_AFLAGS += -m64
         KBUILD_CFLAGS += -m64