Messages in this thread | | | Date | Mon, 14 Sep 2015 14:18:27 -0700 | From | Greg Kroah-Hartman <> | Subject | Re: [4.3-rc1 regression] modular 8250 doesn't load |
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On Mon, Sep 14, 2015 at 02:12:43PM -0700, Greg Kroah-Hartman wrote: > On Mon, Sep 14, 2015 at 10:42:24PM +0200, Mikael Pettersson wrote: > > Greg Kroah-Hartman writes: > > > On Mon, Sep 14, 2015 at 08:06:21PM +0200, Mikael Pettersson wrote: > > > > Greg Kroah-Hartman writes: > > > > > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote: > > > > > > I have CONFIG_SERIAL_8250=m. With 4.2 '/sbin/modprobe 8250' worked > > > > > > and resulted in: > > > > > > > > > > > > [ 41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled > > > > > > [ 41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A > > > > > > > > > > > > With 4.3-rc1 however the command fails and logs the following: > > > > > > > > > > > > [ 34.140300] 8250_base: module license 'unspecified' taints kernel. > > > > > > > > > > Oops, need to fix that. > > > > > > > > > > > [ 34.141846] Disabling lock debugging due to kernel taint > > > > > > [ 34.143388] 8250_base: Unknown symbol uart_insert_char (err 0) > > > > > > [ 34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0) > > > > > > [ 34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0) > > > > > > [ 34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0) > > > > > > [ 34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0) > > > > > > [ 34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0) > > > > > > [ 34.152240] 8250_base: Unknown symbol nr_irqs (err 0) > > > > > > > > > > Are you sure you did 'modprobe' and not 'insmod'? > > > > > > > > Yes, I used modprobe. I double-checked. > > > > > > Then your build should have failed if these functions are not being > > > exported properly by your .config. Most of these are in the serial_core > > > module, is that present/loaded? > > > > Yes, serial_core is loaded. > > > > uart_insert_char is EXPORT_SYMBOL_GPL, so could the missing license tag be preventing > > 8250_core from binding to it? (I haven't checked the other symbols but I assume they > > are also _GPL.) > > Ah, crap, yes, you are right. You can test this with a simple: > MODULE_LICENSE("GPL"); > line added to the 8250_base file.
Wait, 8250_base.c has a module license line.
Can you provide a full .config file?
thanks,
greg k-h
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