mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-07-25 16:19:48 +02:00
Alexander LobakinandGreg Kroah-Hartman
0a95318f4c
[ Upstream commit7d8296b250] Avoid open-coding that simple expression each time by moving BYTES_TO_BITS() from the probes code to <linux/bitops.h> to export it to the rest of the kernel. Simplify the macro while at it. `BITS_PER_LONG / sizeof(long)` always equals to %BITS_PER_BYTE, regardless of the target architecture. Do the same for the tools ecosystem as well (incl. its version of bitops.h). The previous implementation had its implicit type of long, while the new one is int, so adjust the format literal accordingly in the perf code. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> Acked-by: Yury Norov <yury.norov@gmail.com> Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of:55052184ac("iio: common: st_sensors: honour channel endianness in read_axis_data") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_BITOPS_H_
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#define _TOOLS_LINUX_BITOPS_H_
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#include <asm/types.h>
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#include <limits.h>
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#ifndef __WORDSIZE
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#define __WORDSIZE (__SIZEOF_LONG__ * 8)
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#endif
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#ifndef BITS_PER_LONG
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# define BITS_PER_LONG __WORDSIZE
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#endif
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#include <linux/bits.h>
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#include <linux/compiler.h>
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#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
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#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
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#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
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#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
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#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
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#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_BYTE)
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extern unsigned int __sw_hweight8(unsigned int w);
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extern unsigned int __sw_hweight16(unsigned int w);
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extern unsigned int __sw_hweight32(unsigned int w);
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extern unsigned long __sw_hweight64(__u64 w);
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/*
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* Defined here because those may be needed by architecture-specific static
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* inlines.
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*/
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#define bitop(op, nr, addr) \
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op(nr, addr)
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#define __set_bit(nr, addr) bitop(___set_bit, nr, addr)
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#define __clear_bit(nr, addr) bitop(___clear_bit, nr, addr)
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#define __change_bit(nr, addr) bitop(___change_bit, nr, addr)
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#define __test_and_set_bit(nr, addr) bitop(___test_and_set_bit, nr, addr)
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#define __test_and_clear_bit(nr, addr) bitop(___test_and_clear_bit, nr, addr)
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#define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr)
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#define test_bit(nr, addr) bitop(_test_bit, nr, addr)
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/*
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* Include this here because some architectures need generic_ffs/fls in
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* scope
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*
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* XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
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*/
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#include <asm-generic/bitops.h>
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#define for_each_set_bit(bit, addr, size) \
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for ((bit) = find_first_bit((addr), (size)); \
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(bit) < (size); \
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(bit) = find_next_bit((addr), (size), (bit) + 1))
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#define for_each_clear_bit(bit, addr, size) \
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for ((bit) = find_first_zero_bit((addr), (size)); \
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(bit) < (size); \
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(bit) = find_next_zero_bit((addr), (size), (bit) + 1))
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/* same as for_each_set_bit() but use bit as value to start with */
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#define for_each_set_bit_from(bit, addr, size) \
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for ((bit) = find_next_bit((addr), (size), (bit)); \
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(bit) < (size); \
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(bit) = find_next_bit((addr), (size), (bit) + 1))
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static inline unsigned long hweight_long(unsigned long w)
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{
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return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
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}
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static inline unsigned fls_long(unsigned long l)
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{
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if (sizeof(l) == 4)
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return fls(l);
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return fls64(l);
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}
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/**
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* rol32 - rotate a 32-bit value left
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* @word: value to rotate
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* @shift: bits to roll
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*/
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static inline __u32 rol32(__u32 word, unsigned int shift)
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{
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return (word << shift) | (word >> ((-shift) & 31));
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}
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#endif
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