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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2010-09-29 11:08:50 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-09 21:51:44 +0200 |
| commit | 708ff2a0097b02d32d375b66996661f36cd4d6d1 (patch) | |
| tree | 66f7922a1e35de1ad15ba84849bd6fc602c26087 /include/asm-generic | |
| parent | asm-generic: kdebug.h: Checkpatch cleanup (diff) | |
| download | linux-708ff2a0097b02d32d375b66996661f36cd4d6d1.tar.xz linux-708ff2a0097b02d32d375b66996661f36cd4d6d1.zip | |
bitops: make asm-generic/bitops/find.h more generic
asm-generic/bitops/find.h has the extern declarations of find_next_bit()
and find_next_zero_bit() and the macro definitions of find_first_bit()
and find_first_zero_bit(). It is only usable by the architectures which
enables CONFIG_GENERIC_FIND_NEXT_BIT and disables
CONFIG_GENERIC_FIND_FIRST_BIT.
x86 and tile enable both CONFIG_GENERIC_FIND_NEXT_BIT and
CONFIG_GENERIC_FIND_FIRST_BIT. These architectures cannot include
asm-generic/bitops/find.h in their asm/bitops.h. So ifdefed extern
declarations of find_first_bit and find_first_zero_bit() are put in
linux/bitops.h.
This makes asm-generic/bitops/find.h usable by these architectures
and use it. Also this change is needed for the forthcoming duplicated
extern declarations cleanup.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/bitops/find.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/find.h b/include/asm-generic/bitops/find.h index 1914e9742512..30afec0db7d7 100644 --- a/include/asm-generic/bitops/find.h +++ b/include/asm-generic/bitops/find.h @@ -9,7 +9,32 @@ extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, unsigned long offset); #endif +#ifdef CONFIG_GENERIC_FIND_FIRST_BIT + +/** + * find_first_bit - find the first set bit in a memory region + * @addr: The address to start the search at + * @size: The maximum size to search + * + * Returns the bit number of the first set bit. + */ +extern unsigned long find_first_bit(const unsigned long *addr, + unsigned long size); + +/** + * find_first_zero_bit - find the first cleared bit in a memory region + * @addr: The address to start the search at + * @size: The maximum size to search + * + * Returns the bit number of the first cleared bit. + */ +extern unsigned long find_first_zero_bit(const unsigned long *addr, + unsigned long size); +#else /* CONFIG_GENERIC_FIND_FIRST_BIT */ + #define find_first_bit(addr, size) find_next_bit((addr), (size), 0) #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0) +#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ + #endif /*_ASM_GENERIC_BITOPS_FIND_H_ */ |