From 77b9bd9c49442407804c37bcc82021a35277f83c Mon Sep 17 00:00:00 2001 From: Alexander van Heukelum Date: Tue, 1 Apr 2008 11:46:19 +0200 Subject: x86: generic versions of find_first_(zero_)bit, convert i386 Generic versions of __find_first_bit and __find_first_zero_bit are introduced as simplified versions of __find_next_bit and __find_next_zero_bit. Their compilation and use are guarded by a new config variable GENERIC_FIND_FIRST_BIT. The generic versions of find_first_bit and find_first_zero_bit are implemented in terms of the newly introduced __find_first_bit and __find_first_zero_bit. This patch does not remove the i386-specific implementation, but it does switch i386 to use the generic functions by setting GENERIC_FIND_FIRST_BIT=y for X86_32. Signed-off-by: Alexander van Heukelum Signed-off-by: Ingo Molnar --- include/linux/bitops.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'include/linux') diff --git a/include/linux/bitops.h b/include/linux/bitops.h index 3865f2c93bd..355d67ba3bd 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -113,6 +113,40 @@ static inline unsigned fls_long(unsigned long l) } #ifdef __KERNEL__ +#ifdef CONFIG_GENERIC_FIND_FIRST_BIT +extern unsigned long __find_first_bit(const unsigned long *addr, + unsigned long size); + +/** + * 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. + */ +static __always_inline unsigned long +find_first_bit(const unsigned long *addr, unsigned long size) +{ + return __find_first_bit(addr, size); +} + +extern unsigned long __find_first_zero_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. + */ +static __always_inline unsigned long +find_first_zero_bit(const unsigned long *addr, unsigned long size) +{ + return __find_first_zero_bit(addr, size); +} +#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ + #ifdef CONFIG_GENERIC_FIND_NEXT_BIT extern unsigned long __find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset); -- cgit v1.2.3