linux-kernel - Re: [PATCH] STAGING: Comedi: Build only on arches providing PAGE_KERNEL

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Date:	Thu, 23 Jun 2011 16:05:57 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Martyn Welch <martyn.welch@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org,
	linux-am33-list@...hat.com, Paul Mundt <lethal@...ux-sh.org>,
	linux-sh@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-arch@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"linuxppc-dev@...ts.ozlabs.org Tony Luck" <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: [PATCH] STAGING: Comedi: Build only on arches providing
 PAGE_KERNEL_NOCACHE

On Thu, Jun 23, 2011 at 07:10:29AM -0500, Kumar Gala wrote:

> > (Adding the PPC folks to cc.)
> > 
> > A "git grep -w PAGE_KERNEL_NOCACHE arch/powerpc/" doesn't find anything so
> > I don't think the driver will build there.  I don't have a PPC toolchain
> > to verify that.
> 
> I can verify it fails on PPC as well:
> 
> drivers/staging/comedi/drivers.c: In function 'comedi_buf_alloc':
> drivers/staging/comedi/drivers.c:505:37: error: 'PAGE_KERNEL_NOCACHE' undeclared (first use in this function)
> drivers/staging/comedi/drivers.c:505:37: note: each undeclared identifier is reported only once for each function it appears in
> 
> However, we do have a #define for PAGE_KERNEL_NC.

Do you think this driver in it's current stage is so valuable that some
ifdefery to get it to work on PPC is the way to go?

IA-64 has PAGE_KERNEL_UC, so basically the same question for IA-64, too.

But preferably the driver should be sorted out properly and until the v1
of my patch which disables it on all architectures that don't provide a
PAGE_KERNEL_NOCACHE definition will do just fine.

  Ralf
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