x86: Detect stack protector for i386 builds on x86_64

Stack protector support was not detected when building with
ARCH=i386 on x86_64 systems:

arch/x86/Makefile:80: stack protector enabled but no compiler support

The "-m32" argument needs to be passed to the detection script.

Signed-off-by: Michal Schmidt <[e-mail]>
Cc: Tejun Heo <[e-mail]>
Cc: Jeremy Fitzhardinge <[e-mail]>
Cc: Arjan van de Ven <[e-mail]>
LKML-Reference: <20090829182718.10f566b1@leela>
Signed-off-by: Ingo Molnar <[e-mail]>
--

arch/x86/Makefile

···
 
 ifdef CONFIG_CC_STACKPROTECTOR
 	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
-        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y)
+        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(biarch)),y)
                 stackp-y := -fstack-protector
                 stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
                 KBUILD_CFLAGS += $(stackp-y)