mmap_cache: remove mmap_cache_is_enabled

This function is no longer used and could be removed.

* mmap_cache.c (mmap_cache_is_enabled): Remove.
* mmap_cache.h: Likewise.

mmap_cache.c

@@ -34,7 +34,6 @@
 #include "xstring.h"
 
 static unsigned int mmap_cache_generation;
-static bool use_mmap_cache;
 
 static void
 mmap_cache_invalidate(struct tcb *tcp, void *unused)
@@ -55,17 +54,14 @@ mmap_cache_invalidate(struct tcb *tcp, void *unused)
 void
 mmap_cache_enable(void)
 {
+	static bool use_mmap_cache;
+
 	if (!use_mmap_cache) {
 		mmap_notify_register_client(mmap_cache_invalidate, NULL);
 		use_mmap_cache = true;
 	}
 }
 
-extern bool mmap_cache_is_enabled(void)
-{
-	return use_mmap_cache;
-}
-
 /*
  * caching of /proc/ID/maps for each process to speed up stack tracing
  *

mmap_cache.h

@@ -68,9 +68,6 @@ enum mmap_cache_rebuild_result {
 extern void
 mmap_cache_enable(void);
 
-extern bool
-mmap_cache_is_enabled(void);
-
 extern void
 mmap_cache_delete(struct tcb *, const char *caller);