linux-kernel - Re: [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX

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Message-ID: <20161017090937.GG3359@quack2.suse.cz>
Date:   Mon, 17 Oct 2016 11:09:37 +0200
From:   Jan Kara <jack@...e.cz>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-nvdimm@...ts.01.org,
        linux-xfs@...r.kernel.org
Subject: Re: [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX_PMD

On Mon 17-10-16 11:27:24, Aneesh Kumar K.V wrote:
> Ross Zwisler <ross.zwisler@...ux.intel.com> writes:
> 
> > Now that DAX PMD faults are once again working and are now participating in
> > DAX's radix tree locking scheme, allow their config option to be enabled.
> >
> > Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> > ---
> >  fs/Kconfig | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/fs/Kconfig b/fs/Kconfig
> > index 2bc7ad7..b6f0fce 100644
> > --- a/fs/Kconfig
> > +++ b/fs/Kconfig
> > @@ -55,7 +55,6 @@ config FS_DAX_PMD
> >  	depends on FS_DAX
> >  	depends on ZONE_DEVICE
> >  	depends on TRANSPARENT_HUGEPAGE
> > -	depends on BROKEN
> >  
> >  endif # BLOCK
> 
> 
> This series made dax_pmd_fault return VM_FAULT_FALLBACK in [PATCH v6 09/17] dax: remove dax_pmd_fault(). 
> That essentially disable dax pmd for ext4. Any plans to fix that ?

I'm working on converting ext4 to the new iomap infrastructure. Once that
is done, it can use new DAX helpers for PMD faults easily.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR