1 files changed, 91 insertions, 0 deletions
diff --git a/include/linux/export.h b/include/linux/export.h
new file mode 100644
index 000000000..9911508a9
--- /dev/null
+++ b/include/linux/export.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _LINUX_EXPORT_H
+#define _LINUX_EXPORT_H
+
+#include <linux/compiler.h>
+#include <linux/linkage.h>
+#include <linux/stringify.h>
+
+/*
+ * Export symbols from the kernel to modules.  Forked from module.h
+ * to reduce the amount of pointless cruft we feed to gcc when only
+ * exporting a simple symbol or two.
+ *
+ * Try not to add #includes here.  It slows compilation and makes kernel
+ * hackers place grumpy comments in header files.
+ */
+
+/*
+ * This comment block is used by fixdep. Please do not remove.
+ *
+ * When CONFIG_MODVERSIONS is changed from n to y, all source files having
+ * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
+ * side effect of the *.o build rule.
+ */
+
+#ifndef __ASSEMBLY__
+#ifdef MODULE
+extern struct module __this_module;
+#define THIS_MODULE (&__this_module)
+#else
+#define THIS_MODULE ((struct module *)0)
+#endif
+#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_64BIT
+#define __EXPORT_SYMBOL_REF(sym)			\
+	.balign 8				ASM_NL	\
+	.quad sym
+#else
+#define __EXPORT_SYMBOL_REF(sym)			\
+	.balign 4				ASM_NL	\
+	.long sym
+#endif
+
+#define ___EXPORT_SYMBOL(sym, license, ns)		\
+	.section ".export_symbol","a"		ASM_NL	\
+	__export_symbol_##sym:			ASM_NL	\
+		.asciz license			ASM_NL	\
+		.asciz ns			ASM_NL	\
+		__EXPORT_SYMBOL_REF(sym)	ASM_NL	\
+	.previous
+
+#if defined(__DISABLE_EXPORTS)
+
+/*
+ * Allow symbol exports to be disabled completely so that C code may
+ * be reused in other execution contexts such as the UEFI stub or the
+ * decompressor.
+ */
+#define __EXPORT_SYMBOL(sym, license, ns)
+
+#elif defined(__GENKSYMS__)
+
+#define __EXPORT_SYMBOL(sym, license, ns)	__GENKSYMS_EXPORT_SYMBOL(sym)
+
+#elif defined(__ASSEMBLY__)
+
+#define __EXPORT_SYMBOL(sym, license, ns) \
+	___EXPORT_SYMBOL(sym, license, ns)
+
+#else
+
+#define __EXPORT_SYMBOL(sym, license, ns)			\
+	extern typeof(sym) sym;					\
+	__ADDRESSABLE(sym)					\
+	asm(__stringify(___EXPORT_SYMBOL(sym, license, ns)))
+
+#endif
+
+#ifdef DEFAULT_SYMBOL_NAMESPACE
+#define _EXPORT_SYMBOL(sym, license)	__EXPORT_SYMBOL(sym, license, __stringify(DEFAULT_SYMBOL_NAMESPACE))
+#else
+#define _EXPORT_SYMBOL(sym, license)	__EXPORT_SYMBOL(sym, license, "")
+#endif
+
+#define EXPORT_SYMBOL(sym)		_EXPORT_SYMBOL(sym, "")
+#define EXPORT_SYMBOL_GPL(sym)		_EXPORT_SYMBOL(sym, "GPL")
+#define EXPORT_SYMBOL_NS(sym, ns)	__EXPORT_SYMBOL(sym, "", __stringify(ns))
+#define EXPORT_SYMBOL_NS_GPL(sym, ns)	__EXPORT_SYMBOL(sym, "GPL", __stringify(ns))
+
+#endif /* _LINUX_EXPORT_H */