linux-kernel - Re: [PATCH v4 05/41] counter: add HAS

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Date:   Fri, 19 May 2023 10:21:08 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH v4 05/41] counter: add HAS_IOPORT dependencies

On Fri, May 19, 2023 at 03:39:57PM +0200, Niklas Schnelle wrote:
> On Fri, 2023-05-19 at 15:38 +0200, Niklas Schnelle wrote:
> > On Fri, 2023-05-19 at 15:17 +0200, Niklas Schnelle wrote:
> > > On Thu, 2023-05-18 at 21:26 -0400, William Breathitt Gray wrote:
> > > > On Tue, May 16, 2023 at 01:00:01PM +0200, Niklas Schnelle wrote:
> > > > > In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> > > > > not being declared. We thus need to add HAS_IOPORT as dependency for
> > > > > those drivers using them.
> > > > > 
> > > > > 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>
> > > > 
> > > > Hi Niklas,
> > > > 
> > > > The change itself is fine, but please update the description to reflect
> > > > that this is adding a depends on HAS_IOPORT_MAP rather than HAS_IOPORT,
> > > > along with the reason why it's needed (i.e. devm_ioport_map() is used).
> > > > 
> > > > Thanks,
> > > > 
> > > > William Breathitt Gray
> > > > 
> > > > 
> > > 
> > > Right, this clearly needs adjustment. I went with the following commit
> > > message for v5:
> > > 
> > > "counter: add HAS_IOPORT_MAP dependency
> > > 
> > > The 104_QUAD_8 counter driver uses devm_ioport_map() without depending
> > > on HAS_IOPORT_MAP. This causes compilation to fail on platforms such as
> > > s390 which do not support I/O port mapping. Add the missing
> > > HAS_IOPORT_MAP dependency to fix this."
> > > 
> > 
> > Just noticed this isn't entirely correct. As devm_ioport_map() has an
> > empty stub for HAS_IOPORT_MAP=n this doesn't lead to a compile error it
> > just doesn't work. Will reword to "This causes the driver to not be
> > useable on platforms ..."
> 
> s/useable/usable/

104_QUAD_8 has an explicit dependency on PC104 and X86, so I don't think
it would ever be used outside of x86 platforms. Does it still make sense
to have the HAS_IOPORT_MAP dependency in this case?

William Breathitt Gray

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