linux-kernel - [PATCH 06/20] arm64: ensure the kernel is compiled for LP64

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Message-ID: <1483961397-8599-7-git-send-email-ynorov@caviumnetworks.com>
Date:   Mon, 9 Jan 2017 16:59:43 +0530
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        "linux-arch @ vger . kernel . org Arnd Bergmann" <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>
CC:     Yury Norov <ynorov@...iumnetworks.com>,
        Andrew Pinski <pinskia@...il.com>,
        Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
        Adam Borowski <kilobyte@...band.pl>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Steve Ellcey <sellcey@...iumnetworks.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Ramana Radhakrishnan <ramana.gcc@...glemail.com>,
        Florian Weimer <fweimer@...hat.com>,
        Bamvor Zhangjian <bamvor.zhangjian@...wei.com>,
        Andreas Schwab <schwab@...e.de>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        <schwidefsky@...ibm.com>, <broonie@...nel.org>,
        Joseph Myers <joseph@...esourcery.com>,
        <christoph.muellner@...obroma-systems.com>,
        <szabolcs.nagy@....com>, <klimov.linux@...il.com>,
        <Nathan_Lynch@...tor.com>, <agraf@...e.de>,
        <Prasun.Kapoor@...iumnetworks.com>, <geert@...ux-m68k.org>,
        <philipp.tomsich@...obroma-systems.com>,
        <manuel.montezelo@...il.com>, <linyongting@...wei.com>,
        <davem@...emloft.net>, <zhouchengming1@...wei.com>,
        Andrew Pinski <apinski@...ium.com>
Subject: [PATCH 06/20] 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: Andrew Pinski <Andrew.Pinski@...iumnetworks.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
Reviewed-by: David Daney <ddaney@...iumnetworks.com>
---
 arch/arm64/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index b9a4a93..c89734d 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -48,15 +48,20 @@ 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
 AS		+= -EB
 LD		+= -EB
+LDFLAGS		+= -maarch64linuxb
 UTS_MACHINE	:= aarch64_be
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
 AS		+= -EL
 LD		+= -EL
+LDFLAGS		+= -maarch64linux
 UTS_MACHINE	:= aarch64
 endif
 
-- 
2.7.4