linux-kernel - Re: [PATCH] serial: forbid 8250 on s390

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Message-Id: <8e92cb31-f35a-6f4b-7409-035e87c0818a@de.ibm.com>
Date:   Tue, 12 Dec 2017 09:56:05 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: forbid 8250 on s390



On 12/12/2017 09:48 AM, Greg Kroah-Hartman wrote:
> On Tue, Dec 12, 2017 at 09:08:35AM +0100, Christian Borntraeger wrote:
>> Using "make kvmconfig" results in a potentially unusable linux image
>> on s390.  The reason is that both the (default on s390) sclp consoles
>> as well as the 8250 console register a ttyS<x> as console. Since there
>> will be no 8250 on s390 let's fence 8250. This will ensure that there
>> is always a working sclp console.
>>
>> Reported-by: Alice Frosi <alice@...ux.vnet.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
>> Reviewed-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
>> ---
>>  drivers/tty/serial/8250/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
> 
> Does this need to be backported to any stable kernels?  Or does anyone
> who runs them on s390 already have this config option disabled?

All shipped s390 kernels have 8250 disabled anyway. A backport of this
patch could be helpful to let users who want to use "make kvmconfig" give 
a working configuration but it is certainly not critical.

Christian