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The header is included in <linux/xarray.h> like it is on Linux. Some DRM code depends on this header "pollution". Reviewed by: bz Approved by: bz Differential Revision: https://reviews.freebsd.org/D38567
78 lines
3.7 KiB
C
78 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 The FreeBSD Foundation
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*
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* This software was developed by Björn Zeeb under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUXKPI_LINUX_KCONFIG_H_
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#define _LINUXKPI_LINUX_KCONFIG_H_
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/*
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* Checking if an option is defined would be easy if we could do CPP inside CPP.
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* The defined case whether -Dxxx or -Dxxx=1 are easy to deal with. In either
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* case the defined value is "1". A more general -Dxxx=<c> case will require
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* more effort to deal with all possible "true" values. Hope we do not have
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* to do this as well.
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* The real problem is the undefined case. To avoid this problem we do the
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* concat/varargs trick: "yyy" ## xxx can make two arguments if xxx is "1"
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* by having a #define for yyy_1 which is "ignore,".
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* Otherwise we will just get "yyy".
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* Need to be careful about variable substitutions in macros though.
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* This way we make a (true, false) problem a (don't care, true, false) or a
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* (don't care true, false). Then we can use a variadic macro to only select
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* the always well known and defined argument #2. And that seems to be
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* exactly what we need. Use 1 for true and 0 for false to also allow
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* #if IS_*() checks pre-compiler checks which do not like #if true.
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*/
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#define ___XAB_1 dontcare,
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#define ___IS_XAB(_ignore, _x, ...) (_x)
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#define __IS_XAB(_x) ___IS_XAB(_x 1, 0)
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#define _IS_XAB(_x) __IS_XAB(__CONCAT(___XAB_, _x))
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/* This is if CONFIG_ccc=y. */
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#define IS_BUILTIN(_x) _IS_XAB(_x)
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/* This is if CONFIG_ccc=m. */
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#define IS_MODULE(_x) _IS_XAB(_x ## _MODULE)
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/* This is if CONFIG_ccc is compiled in(=y) or a module(=m). */
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#define IS_ENABLED(_x) (IS_BUILTIN(_x) || IS_MODULE(_x))
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/*
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* This is weird case. If the CONFIG_ccc is builtin (=y) this returns true;
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* or if the CONFIG_ccc is a module (=m) and the caller is built as a module
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* (-DMODULE defined) this returns true, but if the callers is not a module
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* (-DMODULE not defined, which means caller is BUILTIN) then it returns
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* false. In other words, a module can reach the kernel, a module can reach
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* a module, but the kernel cannot reach a module, and code never compiled
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* cannot be reached either.
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* XXX -- I'd hope the module-to-module case would be handled by a proper
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* module dependency definition (MODULE_DEPEND() in FreeBSD).
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*/
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#define IS_REACHABLE(_x) (IS_BUILTIN(_x) || \
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(IS_MODULE(_x) && IS_BUILTIN(MODULE)))
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#endif /* _LINUXKPI_LINUX_KCONFIG_H_ */
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