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Date: Fri, 21 Jul 2017 12:02:19 -0600
From: Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: Re: [PATCH v3 1/5] mm: add vm_insert_mixed_mkwrite()
Message-ID: <20170721180219.GB18697@linux.intel.com>
References: <20170628220152.28161-1-ross.zwisler@linux.intel.com>
 <20170628220152.28161-2-ross.zwisler@linux.intel.com>
 <20170720152616.GB6664@redhat.com>
 <20170720155922.GA21186@linux.intel.com>
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To: Ross Zwisler <ross.zwisler@linux.intel.com>, Vivek Goyal <vgoyal@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, "Darrick J. Wong" <darrick.wong@oracle.com>, Theodore Ts'o <tytso@mit.edu>, Alexander Viro <viro@zeniv.linux.org.uk>, Andreas Dilger <adilger.kernel@dilger.ca>, Christoph Hellwig <hch@lst.de>, Dan Williams <dan.j.williams@intel.com>, Dave Hansen <dave.hansen@intel.com>, Ingo Molnar <mingo@redhat.com>, Jan Kara <jack@suse.cz>, Jonathan Corbet <corbet@lwn.net>, Matthew Wilcox <mawilcox@microsoft.com>, Steven Rostedt <rostedt@goodmis.org>, linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-xfs@vger.kernel.org

On Thu, Jul 20, 2017 at 09:59:22AM -0600, Ross Zwisler wrote:
> On Thu, Jul 20, 2017 at 11:26:16AM -0400, Vivek Goyal wrote:
<>
> > Hi Ross,
> > 
> > vm_insert_mixed_mkwrite() is same as vm_insert_mixed() except this sets
> > write parameter to inser_pfn() true. Will it make sense to just add
> > mkwrite parameter to vm_insert_mixed() and not add a new helper function.
> > (like insert_pfn()).
> > 
> > Vivek
> 
> Yep, this is how my initial implementation worked:
> 
> https://lkml.org/lkml/2017/6/7/907
> 
> vm_insert_mixed_mkwrite() was the new version that took an extra parameter,
> and vm_insert_mixed() stuck around as a wrapper that supplied a default value
> for the new parameter, so existing call sites didn't need to change and didn't
> need to worry about the new parameter, but so that we didn't duplicate any
> code.
> 
> I changed this to the way that it currently works based on Dan's feedback in
> that same mail thread.

Looking at this again, I agree that duplicating vm_insert_mixed() seems
undesirable.  For v4 I'll add the flag to vm_insert_mixed() and just update
all the call sites instead of adding a separate wrapper for the mkwrite case,
which will fix this duplication and address Dan's naming concerns.

Thanks for the review feedback.

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