linux-kernel - Re: [PATCH 1/1] tty: serial: handle HAS

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Date: Mon, 08 Apr 2024 17:35:59 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby
 <jirislaby@...nel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        Arnd
 Bergmann <arnd@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>,
        LKML
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] tty: serial: handle HAS_IOPORT dependencies

On Mon, 2024-04-08 at 12:54 +0300, Ilpo Järvinen wrote:
> On Fri, 5 Apr 2024, Niklas Schnelle wrote:
> 
> > In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> > compile time. We thus need to add HAS_IOPORT as dependency for those
> > drivers using them unconditionally. For 8250 based drivers some support
> > MMIO only use so fence only the parts requiring I/O ports.
> > 
> > Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> > ---
> > Note: This patch does not depend any not-yet-mainline HAS_IOPORT changes
> > and may be merged via subsystem specific trees at your earliest
> > convenience.
> > 
> > Note 2: This was previously acked here:
> > https://lore.kernel.org/all/2023053050-prodigal-shine-4d1c@gregkh/
> > Given this was almost a year ago and didn't apply then I didn't
> > carry the Ack over though.
> > 
> > 
---8<---
> > diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
> > index 47ff50763c04..54bf98869abf 100644
> > --- a/drivers/tty/serial/8250/Kconfig
> > +++ b/drivers/tty/serial/8250/Kconfig
> > @@ -6,7 +6,6 @@
> >  
> >  config SERIAL_8250
> >  	tristate "8250/16550 and compatible serial support"
> > -	depends on !S390
> 
> Why? Your changelogs gives zero insight on this change.

I used this for compile testing since I build on s390 natively and this
would have hidden the missing HAS_IOPORT dependencies I'm pretty sure
it was added because of the I/O port problem too. I'll either add to
the commit description that it is no longer needed or drop this. Any
preference?