Valgrind updates

Avoid locking sum testing with valgrind compilation.

Make memory unaccessible in the valgrind for dm_pool_abadon_object.

Valgrind hinting should not be needed in _free_chunk for dm_free.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.85 - 
 ===================================
+  Enhance usability with the valgrind memcheck tool.
   Support regular quit of the lvm_thread_fn function in clvmd.
   Fix reading of unallocated memory in lvm1 format import function.
   Replace several strncmp() calls with id_equal().

lib/mm/memlock.c

@@ -195,6 +195,14 @@ static int _maps_line(const struct config_node *cn, lvmlock_t lock,
 		}
 	}
 
+#ifdef VALGRIND_POOL
+	/*
+	 * Valgrind is continually eating memory while executing code
+	 * so we need to deactivate check of locked memory size
+         */
+	sz -= sz; /* = 0, but avoids getting warning about dead assigment */
+
+#endif
 	*mstats += sz;
 	log_debug("%s %10ldKiB %12lx - %12lx %c%c%c%c%s",
 		  (lock == LVM_MLOCK) ? "mlock" : "munlock",

libdm/mm/pool-fast.c

@@ -238,6 +238,9 @@ void *dm_pool_end_object(struct dm_pool *p)
 
 void dm_pool_abandon_object(struct dm_pool *p)
 {
+#ifdef VALGRIND_POOL
+	VALGRIND_MAKE_MEM_NOACCESS(p->chunk, p->object_len);
+#endif
 	p->object_len = 0;
 	p->object_alignment = DEFAULT_ALIGNMENT;
 }
@@ -278,11 +281,5 @@ static struct chunk *_new_chunk(struct dm_pool *p, size_t s)
 
 static void _free_chunk(struct chunk *c)
 {
-	if (c) {
-#ifdef VALGRIND_POOL
-		VALGRIND_MAKE_MEM_UNDEFINED(c, c->end - (char *) c);
-#endif
-
 	dm_free(c);
-	}
 }