Remove unused mutex from hpa_central

include/jemalloc/internal/hpa.h

@@ -9,11 +9,6 @@
 
 typedef struct hpa_central_s hpa_central_t;
 struct hpa_central_s {
-	/*
-	 * The mutex guarding most of the operations on the central data
-	 * structure.
-	 */
-	malloc_mutex_t mtx;
 	/*
 	 * Guards expansion of eden.  We separate this from the regular mutex so
 	 * that cheaper operations can still continue while we're doing the OS

src/hpa.c

@@ -68,11 +68,7 @@ hpa_central_init(hpa_central_t *central, base_t *base, const hpa_hooks_t *hooks)
 	if (err) {
 		return true;
 	}
-	err = malloc_mutex_init(&central->mtx, "hpa_central",
-	    WITNESS_RANK_HPA_CENTRAL, malloc_mutex_rank_exclusive);
-	if (err) {
-		return true;
-	}
+
 	central->base = base;
 	central->eden = NULL;
 	central->eden_len = 0;