linux-kernel - Re: [PATCH v2 1/2] uio: provide vm access to UIO_MEM

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Message-ID: <20130730075239.GN1754@pengutronix.de>
Date:	Tue, 30 Jul 2013 09:52:39 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de, Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH v2 1/2] uio: provide vm access to UIO_MEM_PHYS maps

[expanding Cc: to also include akpm and linux-mm]

Hello,

On Mon, Jul 29, 2013 at 01:09:14PM -0700, Greg Kroah-Hartman wrote:
> On Sun, Jul 28, 2013 at 12:09:37AM +0200, Uwe Kleine-König wrote:
> > This makes it possible to let gdb access mappings of the process that is
> > being debugged.
> > 
> > uio_mmap_logical was moved and uio_vm_ops renamed to group related code
> > and differentiate to new stuff.
> > 
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > ---
> > Changes since v1:
> >     - only use generic_access_phys ifdef CONFIG_HAVE_IOREMAP_PROT
> >     - fix all users of renamed struct
> 
> I still get a build error with this patch:
> 
>   MODPOST 384 modules
> ERROR: "generic_access_phys" [drivers/uio/uio.ko] undefined!
> 
> So something isn't quite right.
Ah, you built as a module and generic_access_phys isn't exported. The
other users of generic_access_phys (arch/x86/pci/i386.c and
drivers/char/mem.c) can only be builtin.

So the IMHO best option is to add an EXPORT_SYMBOL(generic_access_phys)
to mm/memory.c.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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