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tools: Simplify BITS_PER_LONG define

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Do it using (__CHAR_BIT__ * __SIZEOF_LONG__), simpler, works everywhere,
reduces the complexity by ditching CONFIG_64BIT, that was being
synthesized from yet another set of defines, which proved fragile,
breaking the build on linux-next for no obvious reasons.

Committer Note:

Except on:

gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)

Fallback to __WORDSIZE in that case...

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160715072243.GP30154@twins.programming.kicks-ass.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Peter Zijlstra 2016-07-15 12:38:18 -03:00 committed by Arnaldo Carvalho de Melo
parent 32a951b4fd
commit e81fcd4372
1 changed files with 2 additions and 21 deletions
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23
tools/include/asm-generic/bitsperlong.h
View File

@ -3,31 +3,12 @@
#include <uapi/asm-generic/bitsperlong.h>
/*
* In the kernel, where this file comes from, we can rely on CONFIG_64BIT,
* here we have to make amends with what the various compilers provides us
* to figure out if we're on a 64-bit machine...
*/
#ifdef __SIZEOF_LONG__
# if __SIZEOF_LONG__ == 8
# define CONFIG_64BIT
# endif
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
#else
# ifdef __WORDSIZE
# if __WORDSIZE == 64
# define CONFIG_64BIT
# endif
# else
# error Failed to determine BITS_PER_LONG value
# endif
#define BITS_PER_LONG __WORDSIZE
#endif
#ifdef CONFIG_64BIT
#define BITS_PER_LONG 64
#else
#define BITS_PER_LONG 32
#endif /* CONFIG_64BIT */
#if BITS_PER_LONG != __BITS_PER_LONG
#error Inconsistent word size. Check asm/bitsperlong.h
#endif