MySQL的配置文件my.cnf增加log参数文件报错

在[mysqld]后面增加一行
log=/tmp/mysql.log
然后重启mysql,
shell>service mysql restart
然后报错
MySQL server PID file could not be found![失败]
Starting MySQL.The server quit without updating PID file (/var/lib/mysql/xuyou58.com.pid).[失败]
查看日志文件：
2014-06-26 17:22:59 0 [ERROR] /usr/sbin/mysqld: ambiguous option '--log=/var/lib/mysql/mysql.log' (log-bin, log_slave_updates)
2014-06-26 17:22:59 0 [ERROR] Aborting

查了google，解决方案是目前log参数弃用，改用
general_log=ON
general_log_file=/tmp/mysql.log