linux-kernel - [PATCH] x86: uapi: Fix __BITS_PER

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Date:	Thu, 01 Oct 2015 01:40:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	x86@...nel.org
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: uapi: Fix __BITS_PER_LONG for x32

On x32, gcc predefines __x86_64__ but long is only 32-bit.  Use
__ILP32__ to distinguish x32.

Fixes this compiler error in perf:

/«PKGBUILDDIR»/tools/include/asm-generic/bitops/__ffs.h: In function '__ffs':
/«PKGBUILDDIR»/tools/include/asm-generic/bitops/__ffs.h:19:8: error: right shift count >= width of type [-Werror=shift-count-overflow]
   word >>= 32;
        ^

This isn't sufficient to build perf for x32, though.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/include/uapi/asm/bitsperlong.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/uapi/asm/bitsperlong.h b/arch/x86/include/uapi/asm/bitsperlong.h
index b0ae1c4..217909b 100644
--- a/arch/x86/include/uapi/asm/bitsperlong.h
+++ b/arch/x86/include/uapi/asm/bitsperlong.h
@@ -1,7 +1,7 @@
 #ifndef __ASM_X86_BITSPERLONG_H
 #define __ASM_X86_BITSPERLONG_H
 
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__ILP32__)
 # define __BITS_PER_LONG 64
 #else
 # define __BITS_PER_LONG 32
-- 
Ben Hutchings
Knowledge is power.  France is bacon.
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