mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 06:12:08 +00:00
e13b91c1c4
Remove the __uc32_ prefix in find bitops functions.
Move find_* macros behind asm-generic/bitops.h inclusion.
see commit <19de85ef574c3a2182e3ccad9581805052f14946>
bitops: add #ifndef for each of find bitops
also see commit <63e424c84429903c92a0f1e9654c31ccaf6694d0>
arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT}
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
|
|
* linux/arch/unicore32/include/asm/bitops.h
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef __UNICORE_BITOPS_H__
|
|
#define __UNICORE_BITOPS_H__
|
|
|
|
#define _ASM_GENERIC_BITOPS_FLS_H_
|
|
#define _ASM_GENERIC_BITOPS___FLS_H_
|
|
#define _ASM_GENERIC_BITOPS_FFS_H_
|
|
#define _ASM_GENERIC_BITOPS___FFS_H_
|
|
/*
|
|
* On UNICORE, those functions can be implemented around
|
|
* the cntlz instruction for much better code efficiency.
|
|
*/
|
|
|
|
static inline int fls(int x)
|
|
{
|
|
int ret;
|
|
|
|
asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
|
|
ret = 32 - ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define __fls(x) (fls(x) - 1)
|
|
#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
|
|
#define __ffs(x) (ffs(x) - 1)
|
|
|
|
#include <asm-generic/bitops.h>
|
|
|
|
/* following definitions: to avoid using codes in lib/find_*.c */
|
|
#define find_next_bit find_next_bit
|
|
#define find_next_zero_bit find_next_zero_bit
|
|
#define find_first_bit find_first_bit
|
|
#define find_first_zero_bit find_first_zero_bit
|
|
|
|
#endif /* __UNICORE_BITOPS_H__ */
|