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authorMasahiro Yamada <yamada.m@jp.panasonic.com>2014-07-30 14:08:13 +0900
committerTom Rini <trini@ti.com>2014-07-30 08:47:46 -0400
commit0a9064fb47bb0a239c04b0b63edebfdd3a201fdc (patch)
tree2980ef23db7ad1fdb64f80bd6a284243f48d3c97 /include/linux/kconfig.h
parenta98b2378e07fbdb0522173086f265e0b60b53242 (diff)
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kconfig: import Kconfig files from Linux 3.16-rc7
Import - scripts/kconfig/* - include/linux/kconfig.h from Linux 3.16-rc7. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/linux/kconfig.h')
-rw-r--r--include/linux/kconfig.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
new file mode 100644
index 0000000..be342b9
--- /dev/null
+++ b/include/linux/kconfig.h
@@ -0,0 +1,46 @@
+#ifndef __LINUX_KCONFIG_H
+#define __LINUX_KCONFIG_H
+
+#include <generated/autoconf.h>
+
+/*
+ * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
+ * these only work with boolean and tristate options.
+ */
+
+/*
+ * Getting something that works in C and CPP for an arg that may or may
+ * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
+ * we match on the placeholder define, insert the "0," for arg1 and generate
+ * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
+ * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
+ * the last step cherry picks the 2nd arg, we get a zero.
+ */
+#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
+
+/*
+ * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
+ * 0 otherwise.
+ *
+ */
+#define IS_ENABLED(option) \
+ (config_enabled(option) || config_enabled(option##_MODULE))
+
+/*
+ * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
+ * otherwise. For boolean options, this is equivalent to
+ * IS_ENABLED(CONFIG_FOO).
+ */
+#define IS_BUILTIN(option) config_enabled(option)
+
+/*
+ * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
+ * otherwise.
+ */
+#define IS_MODULE(option) config_enabled(option##_MODULE)
+
+#endif /* __LINUX_KCONFIG_H */