112 lines
3.2 KiB
C
Executable file
112 lines
3.2 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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*
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* (C) COPYRIGHT 2014-2015, 2018, 2020-2022 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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*/
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/*
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* Kernel-wide include for common macros and types.
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*/
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#ifndef _MALISW_H_
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#define _MALISW_H_
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#include <linux/version.h>
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/**
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* MIN - Return the lesser of two values.
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* @x: value1
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* @y: value2
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*
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* As a macro it may evaluate its arguments more than once.
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* Refer to MAX macro for more details
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*/
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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/**
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* MAX - Return the greater of two values.
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* @x: value1
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* @y: value2
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*
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* As a macro it may evaluate its arguments more than once.
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* If called on the same two arguments as MIN it is guaranteed to return
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* the one that MIN didn't return. This is significant for types where not
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* all values are comparable e.g. NaNs in floating-point types. But if you want
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* to retrieve the min and max of two values, consider using a conditional swap
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* instead.
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*/
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#define MAX(x, y) ((x) < (y) ? (y) : (x))
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/**
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* CSTD_UNUSED - Function-like macro for suppressing unused variable warnings.
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*
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* @x: unused variable
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*
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* Where possible such variables should be removed; this macro is present for
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* cases where we much support API backwards compatibility.
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*/
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#define CSTD_UNUSED(x) ((void)(x))
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/**
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* CSTD_NOP - Function-like macro for use where "no behavior" is desired.
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* @...: no-op
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*
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* This is useful when compile time macros turn a function-like macro in to a
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* no-op, but where having no statement is otherwise invalid.
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*/
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#define CSTD_NOP(...) ((void)#__VA_ARGS__)
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/**
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* CSTD_STR1 - Function-like macro for stringizing a single level macro.
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* @x: macro's value
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*
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* @code
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* #define MY_MACRO 32
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* CSTD_STR1( MY_MACRO )
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* > "MY_MACRO"
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* @endcode
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*/
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#define CSTD_STR1(x) #x
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/**
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* CSTD_STR2 - Function-like macro for stringizing a macro's value.
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* @x: macro's value
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*
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* This should not be used if the macro is defined in a way which may have no
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* value; use the alternative @c CSTD_STR2N macro should be used instead.
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* @code
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* #define MY_MACRO 32
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* CSTD_STR2( MY_MACRO )
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* > "32"
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* @endcode
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*/
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#define CSTD_STR2(x) CSTD_STR1(x)
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/* LINUX_VERSION_CODE < 5.4 */
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#if (KERNEL_VERSION(5, 4, 0) > LINUX_VERSION_CODE)
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#if defined(GCC_VERSION) && GCC_VERSION >= 70000
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#ifndef __fallthrough
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#define __fallthrough __attribute__((fallthrough))
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#endif /* __fallthrough */
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#define fallthrough __fallthrough
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#else
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#define fallthrough CSTD_NOP(...) /* fallthrough */
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#endif /* GCC_VERSION >= 70000 */
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#endif /* KERNEL_VERSION(5, 4, 0) */
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#endif /* _MALISW_H_ */
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