Re: fs: dax: do not build on ARC or SH

From: Guenter Roeck
Date: Mon Feb 23 2015 - 17:16:27 EST

On Mon, Feb 23, 2015 at 01:58:47PM -0800, Christoph Hellwig wrote:
> On Mon, Feb 23, 2015 at 01:56:34PM -0800, Guenter Roeck wrote:
> > Guess there a philosophical difference in opinion if the architecture code
> > should (have to) provide copy_user_page() or not outside the architecture
> > code itself. After all, fs/dax.c _is_ the only user of this function outside
> > the architecture code.
> Given that copy_user_page just is an optimized version of copy_page
> all these architectures should just grab the trivial macro defintion
> from the asm-generic version so that we could avoid this discussion.
I tried to do just that, for mips, with little success.

Presumably, if copy_page() followed by a conditional flush_data_cache_page()
does not work on mips, I would assume that copy_page() without flush does not
work either.

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