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bitops: add #ifndef for each of find bitops

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The style that we normally use in asm-generic is to test the macro itself
for existence, so in asm-generic, do:

	#ifndef find_next_zero_bit_le
	extern unsigned long find_next_zero_bit_le(const void *addr,
		unsigned long size, unsigned long offset);
	#endif

and in the architectures, write

	static inline unsigned long find_next_zero_bit_le(const void *addr,
		unsigned long size, unsigned long offset)
	#define find_next_zero_bit_le find_next_zero_bit_le

This adds the #ifndef for each of the find bitops in the generic header
and source files.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2011-05-26 16:26:09 -07:00 committed by Linus Torvalds
parent a2812e1783
commit 19de85ef57
5 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/asm-generic/bitops/find.h
View File

@ -1,6 +1,7 @@
#ifndef _ASM_GENERIC_BITOPS_FIND_H_
#define _ASM_GENERIC_BITOPS_FIND_H_
#ifndef find_next_bit
/**
* find_next_bit - find the next set bit in a memory region
* @addr: The address to base the search on
@ -9,7 +10,9 @@
*/
extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
size, unsigned long offset);
#endif
#ifndef find_next_zero_bit
/**
* find_next_zero_bit - find the next cleared bit in a memory region
* @addr: The address to base the search on
@ -18,6 +21,7 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
*/
extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
long size, unsigned long offset);
#endif
#ifdef CONFIG_GENERIC_FIND_FIRST_BIT

7
include/asm-generic/bitops/le.h
View File

@ -30,13 +30,20 @@ static inline unsigned long find_first_zero_bit_le(const void *addr,
#define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
#ifndef find_next_zero_bit_le
extern unsigned long find_next_zero_bit_le(const void *addr,
unsigned long size, unsigned long offset);
#endif
#ifndef find_next_bit_le
extern unsigned long find_next_bit_le(const void *addr,
unsigned long size, unsigned long offset);
#endif
#ifndef find_first_zero_bit_le
#define find_first_zero_bit_le(addr, size) \
find_next_zero_bit_le((addr), (size), 0)
#endif
#else
#error "Please fix <asm/byteorder.h>"

2
include/linux/bitops.h
View File

@ -149,6 +149,7 @@ static inline unsigned long __ffs64(u64 word)
#ifdef __KERNEL__
#ifdef CONFIG_GENERIC_FIND_LAST_BIT
#ifndef find_last_bit
/**
* find_last_bit - find the last set bit in a memory region
* @addr: The address to start the search at
@ -158,6 +159,7 @@ static inline unsigned long __ffs64(u64 word)
*/
extern unsigned long find_last_bit(const unsigned long *addr,
unsigned long size);
#endif
#endif /* CONFIG_GENERIC_FIND_LAST_BIT */
#endif /* __KERNEL__ */

4
lib/find_last_bit.c
View File

@ -15,6 +15,8 @@
#include <asm/types.h>
#include <asm/byteorder.h>
#ifndef find_last_bit
unsigned long find_last_bit(const unsigned long *addr, unsigned long size)
{
unsigned long words;
@ -43,3 +45,5 @@ found:
return size;
}
EXPORT_SYMBOL(find_last_bit);
#endif

12
lib/find_next_bit.c
View File

@ -17,6 +17,7 @@
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
#ifdef CONFIG_GENERIC_FIND_NEXT_BIT
#ifndef find_next_bit
/*
* Find the next set bit in a memory region.
*/
@ -59,7 +60,9 @@ found_middle:
return result + __ffs(tmp);
}
EXPORT_SYMBOL(find_next_bit);
#endif
#ifndef find_next_zero_bit
/*
* This implementation of find_{first,next}_zero_bit was stolen from
* Linus' asm-alpha/bitops.h.
@ -103,9 +106,11 @@ found_middle:
return result + ffz(tmp);
}
EXPORT_SYMBOL(find_next_zero_bit);
#endif
#endif /* CONFIG_GENERIC_FIND_NEXT_BIT */
#ifdef CONFIG_GENERIC_FIND_FIRST_BIT
#ifndef find_first_bit
/*
* Find the first set bit in a memory region.
*/
@ -131,7 +136,9 @@ found:
return result + __ffs(tmp);
}
EXPORT_SYMBOL(find_first_bit);
#endif
#ifndef find_first_zero_bit
/*
* Find the first cleared bit in a memory region.
*/
@ -157,6 +164,7 @@ found:
return result + ffz(tmp);
}
EXPORT_SYMBOL(find_first_zero_bit);
#endif
#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
#ifdef __BIG_ENDIAN
@ -186,6 +194,7 @@ static inline unsigned long ext2_swab(const unsigned long y)
#endif
}
#ifndef find_next_zero_bit_le
unsigned long find_next_zero_bit_le(const void *addr, unsigned
long size, unsigned long offset)
{
@ -229,7 +238,9 @@ found_middle_swap:
return result + ffz(ext2_swab(tmp));
}
EXPORT_SYMBOL(find_next_zero_bit_le);
#endif
#ifndef find_next_bit_le
unsigned long find_next_bit_le(const void *addr, unsigned
long size, unsigned long offset)
{
@ -274,6 +285,7 @@ found_middle_swap:
return result + __ffs(ext2_swab(tmp));
}
EXPORT_SYMBOL(find_next_bit_le);
#endif
#endif /* CONFIG_GENERIC_FIND_BIT_LE */
#endif /* __BIG_ENDIAN */