linux-kernel - Re: [PATCH 0/3] btrfs: Convert kmap/memset/kunmap to memzero

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Date:   Fri, 12 Mar 2021 12:57:57 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] btrfs: Convert kmap/memset/kunmap to memzero_user()

On Thu, Mar 11, 2021 at 07:57:48AM -0800, Ira Weiny wrote:
> On Wed, Mar 10, 2021 at 03:58:36PM -0800, Andrew Morton wrote:
> > On Tue,  9 Mar 2021 13:21:34 -0800 ira.weiny@...el.com wrote:
> > 
> > > Previously this was submitted to convert to zero_user()[1].  zero_user() is not
> > > the same as memzero_user() and in fact some zero_user() calls may be better off
> > > as memzero_user().  Regardless it was incorrect to convert btrfs to
> > > zero_user().
> > > 
> > > This series corrects this by lifting memzero_user(), converting it to
> > > kmap_local_page(), and then using it in btrfs.
> > 
> > This impacts btrfs more than MM.  I suggest the btrfs developers grab
> > it, with my
> 
> I thought David wanted you to take these this time?
> 
> "I can play the messenger again but now it seems a round of review is needed
> and with some testing it'll be possible in some -rc. At that point you may take
> the patches via the mm tree, unless Linus is ok with a late pull."
> 
> 	-- https://lore.kernel.org/lkml/20210224123049.GX1993@twin.jikos.cz/
> 
> But reading that again I'm not sure what he meant.

As Linus had some objections I was not sure it was still feasible for
the merge window, but this is now sorted. This new patchset does further
changes in MM and the btrfs part is a straightforward cleanup. I've
noticed Andrew added the patches to his queue which I'd prefer so I've
added my reviewed-by to the third patch. Thanks.