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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_ARGS_H #define _LINUX_ARGS_H /* * How do these macros work? * * In __COUNT_ARGS() _0 to _12 are just placeholders from the start * in order to make sure _n is positioned over the correct number * from 12 to 0 (depending on X, which is a variadic argument list). * They serve no purpose other than occupying a position. Since each * macro parameter must have a distinct identifier, those identifiers * are as good as any. * * In COUNT_ARGS() we use actual integers, so __COUNT_ARGS() returns * that as _n. */ /* This counts to 12. Any more, it will return 13th argument. */ #define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n #define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) /* Concatenate two parameters, but allow them to be expanded beforehand. */ #define __CONCAT(a, b) a ## b #define CONCATENATE(a, b) __CONCAT(a, b) #endif /* _LINUX_ARGS_H */