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

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Message-ID: <20150223184025.GD2780@wil.cx>
Date:	Mon, 23 Feb 2015 13:40:25 -0500
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	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 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.

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