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git://nv-tegra.nvidia.com/linux-nvgpu.git
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622fe70dab
Fixed following Coverity Defects: ioctl_as.c : Bad bit shift operation mc_tu104.c : Bad bit shift operation vm.c : Bad bit shift operation vm_remap.c : Bad bit shift operation A new linux header file for ilog2 is created. The files which used the old ilog2 function have been changed to use the new nvgpu_ilog2 function. CID 9847922 CID 9869507 CID 9859508 CID 10112314 CID 10127813 CID 10127899 CID 10128004 Signed-off-by: Jinesh Parakh <jparakh@nvidia.com> Change-Id: Ia201eea7cc426c3d6581e1e5ae3b882dbab3b490 Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2700994 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*
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* Copyright (c) 2018-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NVGPU_POSIX_LOG2_H
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#define NVGPU_POSIX_LOG2_H
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#include <nvgpu/bitops.h>
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/**
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* @brief Integer logarithm for base 2.
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*
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* Calculates the log to the base 2 of input value \a x and returns the
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* integer value of the same.
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* Macro does not perform any validation of the parameter.
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*
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* @param x [in] The number to get the log for.
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*
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* @return Integer value of log to the base 2 of input \a x.
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*/
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#define nvgpu_ilog2(x) ({ \
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unsigned long fls_val = nvgpu_fls(x); \
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\
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nvgpu_assert(fls_val > 0ULL); \
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fls_val = fls_val - 1U; \
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fls_val; \
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})
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/**
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* @brief Round up to the power of two.
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*
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* Rounds up the input number \a x to power of two and returns.
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*
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* @param x [in] Number to round up.
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* - 0 is not a valid value.
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*
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* @return Input value \a x rounded up to the power of two.
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*/
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#define roundup_pow_of_two(x) \
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({ \
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unsigned long ret = 0U; \
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\
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if ((x) == 0UL) { \
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BUG(); \
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} else { \
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ret = 1UL << \
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nvgpu_fls((x) - 1UL); \
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} \
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ret; \
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})
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/**
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* @brief Round down to the power of two.
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*
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* Rounds down the input number \a x to power of two and returns.
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*
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* @param x [in] Number to round down.
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* - 0 is not a valid value.
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*
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* @return Input value \a x rounded down to the power of two.
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*/
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#define rounddown_pow_of_two(x) \
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({ \
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unsigned long ret; \
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\
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if ((x) == 0UL) { \
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BUG(); \
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} else { \
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ret = 1UL << \
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(nvgpu_fls((x)) - 1UL); \
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} \
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ret; \
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})
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/**
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* @brief Check for power of 2.
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*
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* Checks if the input value \a x is a power of two or not.
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* Macro does not perform any validation of the parameter.
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*
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* @param x [in] Number to check.
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*
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* @return True if the input \a x is a power of two, else returns false.
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*/
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#define is_power_of_2(x) \
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(bool)({ \
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typeof(x) __x__ = (x); \
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((__x__ != 0U) && ((__x__ & (__x__ - 1U)) == 0U)); \
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})
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#endif /* NVGPU_POSIX_LOG2_H */
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