linux-kernel - Re: [PATCH 1/3] list_bl: Add hlist_bl_add

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Date:   Wed, 13 Mar 2019 17:25:05 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Nikos Tsironis <ntsironis@...ikto.com>, agk@...hat.com,
        dm-devel@...hat.com, mpatocka@...hat.com, iliastsi@...ikto.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] list_bl: Add hlist_bl_add_before/behind helpers

On Mon, Mar 11, 2019 at 06:43:33PM -0400, Mike Snitzer wrote:
> On Mon, Mar 11 2019 at  6:13pm -0400,
> Paul E. McKenney <paulmck@...ux.ibm.com> wrote:
> 
> > On Mon, Mar 11, 2019 at 11:16:08AM -0700, Christoph Hellwig wrote:
> > > On Thu, Feb 28, 2019 at 04:32:02PM -0500, Mike Snitzer wrote:
> > > > Hi Paul and Christoph,
> > > > 
> > > > You've added your Signed-off-by to include/linux/list_bl.h commits in
> > > > the past.  I'm not sure how this proposed patch should be handled.
> > > > 
> > > > These new hlist_bl_add_{before,behind} changes are a prereq for
> > > > dm-snapshot changes that Nikos has proposed, please see:
> > > > https://patchwork.kernel.org/patch/10739265/
> > > > 
> > > > Any assistance/review you, or others on LKML, might be able to provide
> > > > would be appreciated.
> > > 
> > > I just killed two helpers.  That being said assuming that we only
> > > rely on the next pointer for the lockless traversals the changes look
> > > fine to me, but the code might be beyond my paygrade..
> > 
> > First, apologies for being slow on this one.
> 
> No problem.
>  
> > Second, were the two helpers hlist_bl_add_{before,behind}()?  If so, I
> > guess there is not much point in me looking them over.  Though perhaps
> > I should be looking something else over?
> 
> No, think Christoph was referring to his commit 1879fd6a26571fd4e8e1f
> from 2011.
> 
> Anyway, I'd like you to look over this new proposed patch that
> introduces hlist_bl_add_{before,behind}(), please see:
> https://patchwork.kernel.org/patch/10835713/
> 
> If you're happy with the patch, and can provide your Reviewed-by or
> Acked-by, I'll then pick it up as a prereq for the broader dm-snapshot
> changes that Nikos has provided.

I replied to the version earlier in this email thread.  Looks close,
but a couple of questions.

							Thanx, Paul