linux-kernel - [PATCH v4 02/24] arm64: ensure the kernel is compiled for LP64

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Date:	Mon, 13 Apr 2015 21:44:12 +0200
From:	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Andrew Pinski <apinski@...ium.com>,
	Christoph Muellner <christoph.muellner@...obroma-systems.com>,
	Benedikt Huber <benedikt.huber@...obroma-systems.com>,
	Andreas Kraschitzer <andreas.kraschitzer@...obroma-systems.com>,
	Kumar Sankaran <ksankaran@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Subject: [PATCH v4 02/24] arm64: ensure the kernel is compiled for LP64

From: Andrew Pinski <apinski@...ium.com>

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: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
---
 arch/arm64/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 69ceedc..2ad0c34 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -18,14 +18,18 @@ GZFLAGS		:=-9
 KBUILD_DEFCONFIG := defconfig
 
 KBUILD_CFLAGS	+= -mgeneral-regs-only
+KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
+KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS	+= -mbig-endian
 AS		+= -EB
 LD		+= -EB
+LDFLAGS		+= -maarch64linuxb
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
 AS		+= -EL
 LD		+= -EL
+LDFLAGS		+= -maarch64linux
 endif
 
 CHECKFLAGS	+= -D__aarch64__
-- 
1.9.1

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