linux-kernel - Re: fs: dax: do not build on ARC or SH

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Message-ID: <15459536.KnHx4a8rlg@wuerfel>
Date:	Mon, 23 Feb 2015 22:31:02 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Matthew Wilcox <willy@...ux.intel.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-sh@...r.kernel.org, Vineet Gupta <vgupta@...opsys.com>
Subject: Re: fs: dax: do not build on ARC or SH

On Monday 23 February 2015 13:40:25 Matthew Wilcox wrote:
> On Mon, Feb 23, 2015 at 12:29:45PM +0100, Arnd Bergmann wrote:
> > The DAX implementation relies on the architecture to provide a working
> > copy_user_page() function, as reported by Michael Ellerman's kisskb
> > build bot:
> > 
> > fs/dax.c: error: implicit declaration of function 'copy_user_page' [-Werror=implicit-function-declaration]:  => 266:2
> > 
> > We already have a list of architectures that are known to be incompatible,
> > but the list is missing ARC and SH at the moment. Further, blackfin and
> > c6x also lack support for this function, but are already excluded because
> > they do not support MMU-based kernels.
> 
> I've got a short list of patches for DAX; I'll add this one to the list.

Ok, thanks!

> Have the maintainers of these architectures been notified that they're
> missing a core piece of kernel functionality?

Not until you put them on Cc here.

	Arnd
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