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-rw-r--r--backport-include/linux/kconfig.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/backport-include/linux/kconfig.h b/backport-include/linux/kconfig.h
new file mode 100644
index 0000000..d1faad9
--- /dev/null
+++ b/backport-include/linux/kconfig.h
@@ -0,0 +1,45 @@
+#ifndef __BACKPORT_LINUX_KCONFIG_H
+#define __BACKPORT_LINUX_KCONFIG_H
+#include <linux/version.h>
+#if LINUX_VERSION_IS_GEQ(3,1,0)
+#include_next <linux/kconfig.h>
+#endif
+
+#ifndef __ARG_PLACEHOLDER_1
+#define __ARG_PLACEHOLDER_1 0,
+#define config_enabled(cfg) _config_enabled(cfg)
+#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
+#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
+#define ___config_enabled(__ignored, val, ...) val
+
+/*
+ * 3.1 - 3.3 had a broken version of this, so undef
+ * (they didn't have __ARG_PLACEHOLDER_1)
+ */
+#undef IS_ENABLED
+#define IS_ENABLED(option) \
+ (config_enabled(option) || config_enabled(option##_MODULE))
+#endif
+
+/*
+ * Since 4.9 config_enabled has been removed in favor of __is_defined.
+ */
+#ifndef config_enabled
+#define config_enabled(cfg) __is_defined(cfg)
+#endif
+
+#undef IS_BUILTIN
+#define IS_BUILTIN(option) config_enabled(option)
+
+#ifndef IS_REACHABLE
+/*
+ * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled
+ * code can call a function defined in code compiled based on CONFIG_FOO.
+ * This is similar to IS_ENABLED(), but returns false when invoked from
+ * built-in code when CONFIG_FOO is set to 'm'.
+ */
+#define IS_REACHABLE(option) (config_enabled(option) || \
+ (config_enabled(option##_MODULE) && config_enabled(MODULE)))
+#endif
+
+#endif