More XtraDB after-merge fixes following review and buildbot runs:

 - Better fix for --innodb-use-sys-malloc causing Valgrind warnings.
 - Different fix for INNODB_IBUF_MAX_SIZE variable changing default value.
 - Fix some problems with the safe mutex lazy init patch.

mysql-test/include/mtr_check.sql:
  Do not check INNODB_IBUF_MAX_SIZE for changes. It is not a dynamic variable, so cannot
  be changed by a test case anyway, and the value may vary slightly from one start of the
  server to the next.
mysql-test/lib/mtr_cases.pm:
  Even just starting and stopping the server with --innodb-use-sys-malloc to check for
  disabled test case under valgrind will cause valgrind leak warnings. So add not_valgrind
  to the list of conditions also tested for directly in mysql-test-run.pl.
mysql-test/mysql-test-run.pl:
  Even just starting and stopping the server with --innodb-use-sys-malloc to check for
  disabled test case under valgrind will cause valgrind leak warnings. So add not_valgrind
  to the list of conditions also tested for directly in mysql-test-run.pl.
mysys/thr_mutex.c:
  Fix a few problems found during review of the lazy init safe mutex patch.
storage/xtradb/ibuf/ibuf0ibuf.c:
  Revert previous fix of INNODB_IBUF_MAX_SIZE default varying slightly between server starts.
  (Fixed instead by ignoring that variable in the test suite).

mysql-test/include/mtr_check.sql

@@ -12,7 +12,9 @@ BEGIN
   -- Dump all global variables except those
   -- that are supposed to change
   SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
-    WHERE variable_name != 'timestamp' and variable_name != "debug" order by variable_name;
+   WHERE variable_name != 'timestamp' AND variable_name != "debug"
+     AND variable_name != 'INNODB_IBUF_MAX_SIZE'
+   ORDER BY variable_name;
 
   -- Dump all databases, there should be none
   -- except those that was created during bootstrap

mysql-test/lib/mtr_cases.pm

@@ -970,6 +970,16 @@ sub collect_one_test_case {
     }
   }
 
+  if ( $tinfo->{'not_valgrind'} )
+  {
+    if ( $::opt_valgrind_mysqld )
+    {
+      $tinfo->{'skip'}= 1;
+      $tinfo->{'comment'}= "Not compatible with Valgrind testing";
+      return $tinfo;
+    }
+  }
+
   # ----------------------------------------------------------------------
   # Find config file to use if not already selected in <testname>.opt file
   # ----------------------------------------------------------------------
@@ -1050,6 +1060,7 @@ my @tags=
  ["include/ndb_master-slave.inc", "ndb_test", 1],
  ["federated.inc", "federated_test", 1],
  ["include/not_embedded.inc", "not_embedded", 1],
+ ["include/not_valgrind.inc", "not_valgrind", 1],
 );
 
 

mysql-test/mysql-test-run.pl

@@ -224,7 +224,7 @@ my $opt_strace_client;
 our $opt_user = "root";
 
 my $opt_valgrind= 0;
-my $opt_valgrind_mysqld= 0;
+our $opt_valgrind_mysqld= 0;
 my $opt_valgrind_mysqltest= 0;
 my @default_valgrind_args= ("--show-reachable=yes");
 my @valgrind_args;

mysys/thr_mutex.c

@@ -160,6 +160,9 @@ static int safe_mutex_lazy_init_deadlock_detection(safe_mutex_t *mp)
                        &mp->locked_mutex, sizeof(*mp->locked_mutex),
                        &mp->used_mutex, sizeof(*mp->used_mutex), NullS))
   {
+    /* Disable deadlock handling for this mutex */
+    mp->create_flags|= MYF_NO_DEADLOCK_DETECTION;
+    mp->active_flags|= MYF_NO_DEADLOCK_DETECTION;
     return 1;                                   /* Error */
   }
 
@@ -196,6 +199,9 @@ int safe_mutex_init(safe_mutex_t *mp,
   mp->line= line;
   /* Skip the very common '&' prefix from the autogenerated name */
   mp->name= name[0] == '&' ? name + 1 : name;
+
+  if (!safe_mutex_deadlock_detector)
+    my_flags|= MYF_NO_DEADLOCK_DETECTION;
   /* Deadlock detection is initialised only lazily, on first use. */
 
   mp->create_flags= my_flags;

storage/xtradb/ibuf/ibuf0ibuf.c

@@ -422,12 +422,7 @@ ibuf_init_at_db_start(void)
 	grow in size, as the references on the upper levels of the tree can
 	change */
 
-        /* The default for ibuf_max_size is calculated from the requested
-           buffer pool size srv_buf_pool_size, not the actual size as returned
-           by buf_pool_get_curr_size(). The latter can differ from the former
-           by one page due to alignment requirements, and we do not want a
-           user-visible variable like INNODB_IBUF_MAX_SIZE to vary at random. */
-	ibuf->max_size = ut_min( srv_buf_pool_size / UNIV_PAGE_SIZE
+	ibuf->max_size = ut_min( buf_pool_get_curr_size() / UNIV_PAGE_SIZE
 		/ IBUF_POOL_SIZE_PER_MAX_SIZE, (ulint) srv_ibuf_max_size / UNIV_PAGE_SIZE);
 
 	srv_ibuf_max_size = (long long) ibuf->max_size * UNIV_PAGE_SIZE;