arm64: ensure the kernel is compiled for LP64

The kernel needs to be compiled as a LP64 binary for ARM64, even when
using a compiler that defaults to code-generation for the ILP32 ABI.
Consequently, we need to explicitly pass '-mabi=lp64' (supported on
gcc-4.9 and newer).

Signed-off-by: Andrew Pinski <Andrew.Pinski@caviumnetworks.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Reviewed-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 9b41f1e..939b310 100644 (file)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -50,17 +50,22 @@ KBUILD_CFLAGS       += -fno-asynchronous-unwind-tables
 KBUILD_CFLAGS  += $(call cc-option, -mpc-relative-literal-loads)
 KBUILD_AFLAGS  += $(lseinstr) $(brokengasinst)
 
+KBUILD_CFLAGS  += $(call cc-option,-mabi=lp64)
+KBUILD_AFLAGS  += $(call cc-option,-mabi=lp64)
+
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS        += -mbig-endian
 CHECKFLAGS     += -D__AARCH64EB__
 AS             += -EB
 LD             += -EB
+LDFLAGS                += -maarch64linuxb
 UTS_MACHINE    := aarch64_be
 else
 KBUILD_CPPFLAGS        += -mlittle-endian
 CHECKFLAGS     += -D__AARCH64EL__
 AS             += -EL
 LD             += -EL
+LDFLAGS                += -maarch64linux
 UTS_MACHINE    := aarch64
 endif