lib/string_choices: add str_true_false()/str_false_true() helper

Add str_true_false()/str_false_true() helper to retur a "true" or "false"
string literal.  We found more than 10 cases currently exist in the tree. 
So these helpers can be used for these cases.


This patch (of 3):

Add str_true_false()/str_false_true() helper to return "true" or "false"
string literal.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Hongbo Li <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Anna Schumaker <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Hongbo Li

include/linux/string_choices.h

@@ -42,6 +42,12 @@ static inline const char *str_yes_no(bool v)
 	return v ? "yes" : "no";
 }
 
+static inline const char *str_true_false(bool v)
+{
+	return v ? "true" : "false";
+}
+#define str_false_true(v)		str_true_false(!(v))
+
 /**
  * str_plural - Return the simple pluralization based on English counts
  * @num: Number used for deciding pluralization