我知道以下内容授予所有名称以'xian_'开头的数据库的所有证据,但是mysql抱怨语法错误near ''xian_......
GRANT ALL PRIVILEGES ON 'xian_%.*' TO xian@'192.168.1.%';
什么是正确的语法？我是否正确地认为_需求\_也在逃避,因为它也是一个通配符？
我正在尝试编写一个简单的Linux内核驱动程序,以便在加载模块时打开GPIO引脚.模块加载工作,但当我调用rmmod删除它时,我收到此错误:
sudo rmmod psctl
[13051.599199] ------------[ cut here ]------------
[13051.608758] WARNING: at drivers/base/core.c:196 device_release+0x78/0x84()
[13051.620581] Device 'psctl.0' does not have a release() function, it is broken and must be fixed.
[13051.637898] Modules linked in: psctl(O-) tmp102 hwmon nfsd rtc_ds1307 i2c_dev snd_bcm2835 snd_pcm snd_page_alloc snd_seq snd_seq_device snd_timer snd spidev leds_gpio led_class spi_bcm2708 i2c_bcm2708 [last unloaded: psctl]
[13051.670268] [<c0013f64>] (unwind_backtrace+0x0/0xf0) from [<c001e80c>] (warn_slowpath_common+0x4c/0x64)
[13051.688743] [<c001e80c>] (warn_slowpath_common+0x4c/0x64) from [<c001e8b8>] (warn_slowpath_fmt+0x30/0x40)
[13051.707217] [<c001e8b8>] (warn_slowpath_fmt+0x30/0x40) from [<c0239240>] (device_release+0x78/0x84)
[13051.725132] [<c0239240>] (device_release+0x78/0x84) from [<c01f4ad8>] (kobject_release+0x50/0x84)
[13051.742880] …