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

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Message-Id: <a009093c-06f6-4ea7-8e72-6ad84125262a@app.fastmail.com>
Date: Tue, 01 Oct 2024 15:31:03 +0000
From: "Arnd Bergmann" <arnd@...nel.org>
To: "Niklas Schnelle" <schnelle@...ux.ibm.com>,
 "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Jiri Slaby" <jirislaby@...nel.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 linux-serial@...r.kernel.org, "Heiko Carstens" <hca@...ux.ibm.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] tty: serial: handle HAS_IOPORT dependencies

On Tue, Oct 1, 2024, at 11:21, Niklas Schnelle wrote:
> On Thu, 2024-05-23 at 03:11 +0100, Maciej W. Rozycki wrote:
>
> With 2 more HAS_IOPORT patches having gone into v6.12-rc1 I'm looking
> at what's left and we're down to 4 prerequisite patches[0] before being
> able to compile-time disable inb()/outb()/…. This one being by far the
> largest of these. Looking at your suggestion it seems that to compile
> 8250_pci.c without HAS_IOPORT I'll have to add #ifdef CONFIG_HAS_IOPORT
> around the MOXI section as that uses I/O ports unconditionally. The
> rest seems fine and I guess would theoretically work on a system with
> !HAS_IOPORT. I'll send a v2 with that included. 

I think that is the correct approach, yes. From what I can tell, the
older version of the 8250 patch added the #ifdef blocks for all other
port types that need port I/O, but the moxa version was added later
than that and just needs the same change.

      Arnd