linux-kernel - [PATCH 3.14 83/83] x86-64, build: Fix stack protector Makefile breakage with 32-bit userland

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Date:	Sun, 11 May 2014 21:20:24 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, George Spelvin <linux@...izon.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 3.14 83/83] x86-64, build: Fix stack protector Makefile breakage with 32-bit userland

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: George Spelvin <linux@...izon.com>

commit 14262d67fe348018af368a07430fbc06eadeabb1 upstream.

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@...izon.com>
Link: http://lkml.kernel.org/r/20140507210552.7581.qmail@ns.horizon.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/Makefile |    1 +
 1 file changed, 1 insertion(+)

--- 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

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