MDEV-6459 max_relay_log_size and sql_slave_skip_counter misbehave on PPC64

make slave_skip_counter and max_relay_log_size ulonglong
(sysvars should generally never be ulong)

sql/rpl_rli.h

@@ -251,10 +251,11 @@ class Relay_log_info : public Slave_reporting_capability
     errors, and have been manually applied by DBA already.
     Must be ulong as it's refered to from set_var.cc
   */
-  volatile ulong slave_skip_counter;
+  volatile ulonglong slave_skip_counter;
+  ulonglong max_relay_log_size;
+
   volatile ulong abort_pos_wait;	/* Incremented on change master */
   volatile ulong slave_run_id;		/* Incremented on slave start */
-  ulong max_relay_log_size;
   mysql_mutex_t log_space_lock;
   mysql_cond_t log_space_cond;
   /*

sql/sql_class.h

@@ -519,6 +519,14 @@ typedef struct system_variables
   ulonglong sortbuff_size;
   ulonglong group_concat_max_len;
   ulonglong default_regex_flags;
+
+  /**
+     Place holders to store Multi-source variables in sys_var.cc during
+     update and show of variables.
+  */
+  ulonglong slave_skip_counter;
+  ulonglong max_relay_log_size;
+
   ha_rows select_limit;
   ha_rows max_join_size;
   ha_rows expensive_subquery_limit;
@@ -587,12 +595,6 @@ typedef struct system_variables
   */
   uint32     gtid_domain_id;
   uint64     gtid_seq_no;
-  /**
-     Place holders to store Multi-source variables in sys_var.cc during
-     update and show of variables.
-  */
-  ulong slave_skip_counter;
-  ulong max_relay_log_size;
 
   /**
     Default transaction access mode. READ ONLY (true) or READ WRITE (false).

sql/sys_vars.cc

@@ -4248,11 +4248,11 @@ static Sys_var_uint Sys_slave_net_timeout(
   Return 0 + warning if it doesn't exist
 */
 
-ulong Sys_var_multi_source_ulong::
-get_master_info_ulong_value(THD *thd, ptrdiff_t offset)
+ulonglong Sys_var_multi_source_ulonglong::
+get_master_info_ulonglong_value(THD *thd, ptrdiff_t offset)
 {
   Master_info *mi;
-  ulong res= 0;                                  // Default value
+  ulonglong res= 0;                                  // Default value
   mysql_mutex_unlock(&LOCK_global_system_variables);
   mysql_mutex_lock(&LOCK_active_mi);
   mi= master_info_index->
@@ -4261,7 +4261,7 @@ get_master_info_ulong_value(THD *thd, ptrdiff_t offset)
   if (mi)
   {
     mysql_mutex_lock(&mi->rli.data_lock);
-    res= *((ulong*) (((uchar*) mi) + master_info_offset));
+    res= *((ulonglong*) (((uchar*) mi) + master_info_offset));
     mysql_mutex_unlock(&mi->rli.data_lock);
   }
   mysql_mutex_unlock(&LOCK_active_mi);    
@@ -4273,7 +4273,7 @@ get_master_info_ulong_value(THD *thd, ptrdiff_t offset)
 bool update_multi_source_variable(sys_var *self_var, THD *thd,
                                   enum_var_type type)
 {
-  Sys_var_multi_source_ulong *self= (Sys_var_multi_source_ulong*) self_var;
+  Sys_var_multi_source_ulonglong *self= (Sys_var_multi_source_ulonglong*) self_var;
   bool result= true;
   Master_info *mi;
 
@@ -4310,17 +4310,13 @@ static bool update_slave_skip_counter(sys_var *self, THD *thd, Master_info *mi)
   return false;
 }
 
-
-static Sys_var_multi_source_ulong
-Sys_slave_skip_counter("sql_slave_skip_counter",
-                       "Skip the next N events from the master log",
-                       SESSION_VAR(slave_skip_counter),
-                       NO_CMD_LINE,
-                       my_offsetof(Master_info, rli.slave_skip_counter),
+static Sys_var_multi_source_ulonglong Sys_slave_skip_counter(
+       "sql_slave_skip_counter", "Skip the next N events from the master log",
+       SESSION_VAR(slave_skip_counter), NO_CMD_LINE,
+       MASTER_INFO_VAR(rli.slave_skip_counter),
        VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1),
        ON_UPDATE(update_slave_skip_counter));
 
-
 static bool update_max_relay_log_size(sys_var *self, THD *thd, Master_info *mi)
 {
   mi->rli.max_relay_log_size= thd->variables.max_relay_log_size;
@@ -4328,16 +4324,13 @@ static bool update_max_relay_log_size(sys_var *self, THD *thd, Master_info *mi)
   return false;
 }
 
-static Sys_var_multi_source_ulong
-Sys_max_relay_log_size( "max_relay_log_size",
-                        "relay log will be rotated automatically when the "
-                        "size exceeds this value.  If 0 are startup, it's "
-                        "set to max_binlog_size",
-                        SESSION_VAR(max_relay_log_size),
-                        CMD_LINE(REQUIRED_ARG),
-                        my_offsetof(Master_info, rli.max_relay_log_size),
-                        VALID_RANGE(0, 1024L*1024*1024), DEFAULT(0),
-                        BLOCK_SIZE(IO_SIZE),
+static Sys_var_multi_source_ulonglong Sys_max_relay_log_size(
+       "max_relay_log_size",
+       "relay log will be rotated automatically when the size exceeds this "
+       "value.  If 0 are startup, it's set to max_binlog_size",
+       SESSION_VAR(max_relay_log_size), CMD_LINE(REQUIRED_ARG),
+       MASTER_INFO_VAR(rli.max_relay_log_size),
+       VALID_RANGE(0, 1024L*1024*1024), DEFAULT(0), BLOCK_SIZE(IO_SIZE),
        ON_UPDATE(update_max_relay_log_size));
 
 static Sys_var_charptr Sys_slave_skip_errors(

sql/sys_vars.h

@@ -1993,7 +1993,8 @@ class Sys_var_replicate_events_marked_for_skip: public Sys_var_enum
   like sql_slave_skip_counter are GLOBAL.
 */
 
-class Sys_var_multi_source_ulong;
+#define MASTER_INFO_VAR(X) my_offsetof(Master_info, X), sizeof(((Master_info *)0x10)->X)
+class Sys_var_multi_source_ulonglong;
 class Master_info;
 
 typedef bool (*on_multi_source_update_function)(sys_var *self, THD *thd,
@@ -2002,31 +2003,27 @@ bool update_multi_source_variable(sys_var *self,
                                   THD *thd, enum_var_type type);
 
 
-class Sys_var_multi_source_ulong :public Sys_var_ulong
+class Sys_var_multi_source_ulonglong :public Sys_var_ulonglong
 { 
   ptrdiff_t master_info_offset;
   on_multi_source_update_function update_multi_source_variable_func;
 public:
-  Sys_var_multi_source_ulong(const char *name_arg,
+  Sys_var_multi_source_ulonglong(const char *name_arg,
                              const char *comment, int flag_args,
                              ptrdiff_t off, size_t size,
                              CMD_LINE getopt,
                              ptrdiff_t master_info_offset_arg,
-                             ulong min_val, ulong max_val, ulong def_val,
-                             uint block_size,
+                             size_t master_info_arg_size,
+                             ulonglong min_val, ulonglong max_val,
+                             ulonglong def_val, uint block_size,
                              on_multi_source_update_function on_update_func)
-    :Sys_var_ulong(name_arg, comment, flag_args, off, size,
+    :Sys_var_ulonglong(name_arg, comment, flag_args, off, size,
                        getopt, min_val, max_val, def_val, block_size,
                        0, VARIABLE_NOT_IN_BINLOG, 0, update_multi_source_variable),
     master_info_offset(master_info_offset_arg),
     update_multi_source_variable_func(on_update_func)
   {
-  }
-  bool session_update(THD *thd, set_var *var)
-  {
-    session_var(thd, ulong)= (ulong) (var->save_result.ulonglong_value);
-    /* Value should be moved to multi_master in on_update_func */
-    return false;
+    SYSVAR_ASSERT(master_info_arg_size == size);
   }
   bool global_update(THD *thd, set_var *var)
   {
@@ -2039,9 +2036,9 @@ class Sys_var_multi_source_ulong :public Sys_var_ulong
   }
   uchar *session_value_ptr(THD *thd,LEX_STRING *base)
   {
-    ulong *tmp, res;
-    tmp= (ulong*) (((uchar*)&(thd->variables)) + offset);
-    res= get_master_info_ulong_value(thd, master_info_offset);
+    ulonglong *tmp, res;
+    tmp= (ulonglong*) (((uchar*)&(thd->variables)) + offset);
+    res= get_master_info_ulonglong_value(thd, master_info_offset);
     *tmp= res;
     return (uchar*) tmp;
   }
@@ -2049,7 +2046,7 @@ class Sys_var_multi_source_ulong :public Sys_var_ulong
   {
     return session_value_ptr(thd, base);
   }
-  ulong get_master_info_ulong_value(THD *thd, ptrdiff_t offset);
+  ulonglong get_master_info_ulonglong_value(THD *thd, ptrdiff_t offset);
   bool update_variable(THD *thd, Master_info *mi)
   {
     return update_multi_source_variable_func(this, thd, mi);