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Date: Tue, 5 Dec 2017 18:27:13 -0800
From: Matthew Wilcox <willy@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>,
        Ross Zwisler <ross.zwisler@linux.intel.com>,
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Subject: Re: [PATCH v4 00/73] XArray version 4
Message-ID: <20171206022713.GN26021@bombadil.infradead.org>
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On Wed, Dec 06, 2017 at 01:17:52PM +1100, Dave Chinner wrote:
> On Wed, Dec 06, 2017 at 01:53:41AM +0000, Matthew Wilcox wrote:
> > Huh, you've caught a couple of problems that 0day hasn't sent me yet.  Try turning on DAX or TRANSPARENT_HUGEPAGE.  Thanks!
> 
> Dax is turned on, CONFIG_TRANSPARENT_HUGEPAGE is not.
> 
> Looks like nothing is setting CONFIG_RADIX_TREE_MULTIORDER, which is
> what xas_set_order() is hidden under.
> 
> Ah, CONFIG_ZONE_DEVICE turns it on, not CONFIG_DAX/CONFIG_FS_DAX.
> 
> Hmmmm.  That seems wrong if it's used in fs/dax.c...

Yes, it's my mistake for not making xas_set_order available in the
!MULTIORDER case.  I'm working on a fix now.

> What a godawful mess Kconfig has turned into.

I'm not going to argue with that ...