https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fec50db7033ea478773b159e0e2efb135270e3b7 authored by Linus Torvalds on 07 April 2024, 20:22:46 UTC
Linux 6.9-rc3
Linux 6.9-rc3
Tip revision: fec50db
count_zeros.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Count leading and trailing zeros functions
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#ifndef _LINUX_BITOPS_COUNT_ZEROS_H_
#define _LINUX_BITOPS_COUNT_ZEROS_H_
#include <asm/bitops.h>
/**
* count_leading_zeros - Count the number of zeros from the MSB back
* @x: The value
*
* Count the number of leading zeros from the MSB going towards the LSB in @x.
*
* If the MSB of @x is set, the result is 0.
* If only the LSB of @x is set, then the result is BITS_PER_LONG-1.
* If @x is 0 then the result is COUNT_LEADING_ZEROS_0.
*/
static inline int count_leading_zeros(unsigned long x)
{
if (sizeof(x) == 4)
return BITS_PER_LONG - fls(x);
else
return BITS_PER_LONG - fls64(x);
}
#define COUNT_LEADING_ZEROS_0 BITS_PER_LONG
/**
* count_trailing_zeros - Count the number of zeros from the LSB forwards
* @x: The value
*
* Count the number of trailing zeros from the LSB going towards the MSB in @x.
*
* If the LSB of @x is set, the result is 0.
* If only the MSB of @x is set, then the result is BITS_PER_LONG-1.
* If @x is 0 then the result is COUNT_TRAILING_ZEROS_0.
*/
static inline int count_trailing_zeros(unsigned long x)
{
#define COUNT_TRAILING_ZEROS_0 (-1)
if (sizeof(x) == 4)
return ffs(x);
else
return (x != 0) ? __ffs(x) : COUNT_TRAILING_ZEROS_0;
}
#endif /* _LINUX_BITOPS_COUNT_ZEROS_H_ */