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

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Message-Id: <20190311221321.GP13351@linux.ibm.com>
Date:   Mon, 11 Mar 2019 15:13:21 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Mike Snitzer <snitzer@...hat.com>,
        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 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.

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?

							Thanx, Paul