linux-kernel - Re: [PATCH] mtd: spi-nor: don't build Cadence QuadSPI on non-ARM

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Date:	Tue, 19 Jul 2016 19:50:27 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	Stefan Roese <sr@...x.de>,
	kbuild test robot <fengguang.wu@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	kbuild-all@...org, Graham Moore <grmoore@...nsource.altera.com>
Subject: Re: [PATCH] mtd: spi-nor: don't build Cadence QuadSPI on non-ARM

On Wed, Jul 20, 2016 at 03:50:27AM +0200, Marek Vasut wrote:
> On 07/19/2016 10:05 PM, Brian Norris wrote:
> > On Tue, Jul 19, 2016 at 08:03:00AM +0200, Stefan Roese wrote:
> >> On 18.07.2016 22:20, Brian Norris wrote:
> >>> Hmm, does x86 not define readsl()/writesl()? I can never tell what
> >>> accessors are supposed to be "standard" across architectures.
> >>>
> >>> Either we need to drop the COMPILE_TEST or maybe make it (!X86 &&
> >>> COMPILE_TEST).
> >>
> >> iowrite32_rep() etc should work for x86 as well.
> > 
> > Looks like it might. I'm not sure the original submitter can retest
> > right now (travel), so I'd probably rather just take the easy fix for
> > now, and we can widen to COMPILE_TEST later if desired.
> 
> Isn't there a generic readsl() and writesl() implementation in
> include/asm-generic/io.h ?

Yes, but somehow x86 has managed to avoid that. I guess it's optional
for arch/<foo>/include/asm/io.h to include <asm-generic/io.h>? At any
rate, I double-checked myself by adding '#error "blah"' to
include/asm-generic/io.h, and x86 still seemed to build fine (at least
for the modules I was checking, like cadence-quadspi.o).

> > If I could get an ack on something like this, I'll apply it soon:
> 
> This is fine, I am making a note to revisit this.

Cool. In that case...

> > ---8<---
> > From: Brian Norris <computersforpeace@...il.com>
> > Date: Tue, 19 Jul 2016 13:02:40 -0700
> > Subject: [PATCH] mtd: spi-nor: don't build Cadence QuadSPI on non-ARM
> > 
> > This controller driver is used only on ARM but is mostly written
> > portably so it can build on other arch'es. Unfortunately, at least x86
> > doesn't provibe readsl()/writesl() accessors. We could possibly fix this
> > issue in the future by using io{read,write}32_rep() instead, but let's
> > just drop the architectures we aren't using for now.
> > 
> > Signed-off-by: Brian Norris <computersforpeace@...il.com>

Applied.

Brian