Re: [PATCH] serial: forbid 8250 on s390

[Greg Kroah-Hartman]

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@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Reviewed-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
> ---
>  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?

thanks,

greg k-h