dev_pagemap related cleanups v2

[Jason Gunthorpe]

On Wed, Jun 19, 2019 at 09:46:23AM -0700, Dan Williams wrote:
> On Wed, Jun 19, 2019 at 9:37 AM Jason Gunthorpe <jgg at ziepe.ca> wrote:
> >
> > On Wed, Jun 19, 2019 at 11:40:32AM +0200, Christoph Hellwig wrote:
> > > On Tue, Jun 18, 2019 at 12:47:10PM -0700, Dan Williams wrote:
> > > > > Git tree:
> > > > >
> > > > >     git://git.infradead.org/users/hch/misc.git hmm-devmem-cleanup.2
> > > > >
> > > > > Gitweb:
> > > > >
> > > > >     http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/hmm-devmem-cleanup.2
> > >
> > > >
> > > > Attached is my incremental fixups on top of this series, with those
> > > > integrated you can add:
> > >
> > > I've folded your incremental bits in and pushed out a new
> > > hmm-devmem-cleanup.3 to the repo above.  Let me know if I didn't mess
> > > up anything else.  I'll wait for a few more comments and Jason's
> > > planned rebase of the hmm branch before reposting.
> >
> > I said I wouldn't rebase the hmm.git (as it needs to go to DRM, AMD
> > and RDMA git trees)..
> >
> > Instead I will merge v5.2-rc5 to the tree before applying this series.
> >
> > I've understood this to be Linus's prefered workflow.
> >
> > So, please send the next iteration of this against either
> > plainv5.2-rc5 or v5.2-rc5 merged with hmm.git and I'll sort it out.
> 
> Just make sure that when you backmerge v5.2-rc5 you have a clear
> reason in the merge commit message about why you needed to do it.
> While needless rebasing is top of the pet peeve list, second place, as
> I found out, is mystery merges without explanations.

Yes, I always describe the merge commits. Linus also particular about
having *good reasons* for merges.

This is why I can't fix the hmm.git to have rc5 until I have patches
to apply..

Probbaly I will just put CH's series on rc5 and merge it with the
cover letter as the merge message. This avoid both rebasing and gives
purposeful merges.

Thanks,
Jason