linux-kernel - [PATCH 20/20] arm64:ilp32: add ARM64

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Date:   Mon, 9 Jan 2017 16:59:57 +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 20/20] arm64:ilp32: add ARM64_ILP32 to Kconfig

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

This patch adds the config option for ILP32.

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/Kconfig | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e668ace..bf34424 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1009,7 +1009,7 @@ source "fs/Kconfig.binfmt"
 
 config COMPAT
 	bool
-	depends on AARCH32_EL0
+	depends on AARCH32_EL0 || ARM64_ILP32
 
 config AARCH32_EL0
 	bool "Kernel support for 32-bit EL0"
@@ -1031,6 +1031,14 @@ config AARCH32_EL0
 
 	  If you want to execute 32-bit userspace applications, say Y.
 
+config ARM64_ILP32
+	bool "Kernel support for ILP32"
+	select COMPAT
+	help
+	  This option enables support for AArch64 ILP32 user space.  ILP32
+	  is an ABI where long and pointers are 32bits but it uses the AARCH64
+	  instruction set.
+
 config SYSVIPC_COMPAT
 	def_bool y
 	depends on COMPAT && SYSVIPC
-- 
2.7.4