linux-kernel - [PATCH v6 05/19] arm64:uapi: set __BITS_PER

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Date:	Wed, 18 Nov 2015 00:16:45 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<arnd@...db.de>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<pinskia@...il.com>, <ddaney.cavm@...il.com>,
	<jan.dakinevich@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<christoph.muellner@...obroma-systems.com>,
	<philipp.tomsich@...obroma-systems.com>, <broonie@...nel.org>,
	<andrey.konovalov@...aro.org>, <Nathan_Lynch@...tor.com>,
	<agraf@...e.de>, <bamvor.zhangjian@...wei.com>,
	<klimov.linux@...il.com>, <joseph@...esourcery.com>,
	<schwab@...e.de>, Yury Norov <ynorov@...iumnetworks.com>
Subject: [PATCH v6 05/19] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64

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

Define __BITS_PER_LONG depending on the ABI used (i.e. check whether
__ILP32__ or __LP64__ is defined).  This is necessary for glibc to
determine the appropriate type definitions for the system call interface.

Reviewed-by: David Daney <ddaney@...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>
---
 arch/arm64/include/uapi/asm/bitsperlong.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/bitsperlong.h b/arch/arm64/include/uapi/asm/bitsperlong.h
index fce9c29..4265243 100644
--- a/arch/arm64/include/uapi/asm/bitsperlong.h
+++ b/arch/arm64/include/uapi/asm/bitsperlong.h
@@ -16,7 +16,14 @@
 #ifndef __ASM_BITSPERLONG_H
 #define __ASM_BITSPERLONG_H
 
-#define __BITS_PER_LONG 64
+#if defined(__LP64__)
+/* Assuming __LP64__ will be defined for native ELF64's and not for ILP32. */
+#  define __BITS_PER_LONG 64
+#elif defined(__ILP32__)
+#  define __BITS_PER_LONG 32
+#else
+#  error "Neither LP64 nor ILP32: unsupported ABI in asm/bitsperlong.h"
+#endif
 
 #include <asm-generic/bitsperlong.h>
 
-- 
2.1.4

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