write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/include/linux/const.h
..
..
@@ -3,4 +3,12 @@
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 #include <vdso/const.h>
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+/*
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+ * This returns a constant expression while determining if an argument is
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+ * a constant expression, most importantly without evaluating the argument.
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+ * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
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+ */
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+#define __is_constexpr(x) \
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+	(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
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+
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 #endif /* _LINUX_CONST_H */