linux-kernel - Re: [PATCH 6.0 19/20] mm/huge_memory: do not clobber swp_entry

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Date:   Sat, 29 Oct 2022 20:33:01 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Mel Gorman <mgorman@...hsingularity.net>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Yang Shi <shy828301@...il.com>,
        Brian Foster <bfoster@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Seth Jennings <sjenning@...hat.com>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Subject: Re: [PATCH 6.0 19/20] mm/huge_memory: do not clobber swp_entry_t
 during THP split

On Tue, 25 Oct 2022, Greg Kroah-Hartman wrote:
> On Tue, Oct 25, 2022 at 08:11:44AM -0700, Hugh Dickins wrote:
> > On Mon, 24 Oct 2022, Greg Kroah-Hartman wrote:
> > > From: Mel Gorman <mgorman@...hsingularity.net>
> > > 
> > > commit 71e2d666ef85d51834d658830f823560c402b8b6 upstream.
> > >...
> > 
> > Greg, this patch from Mel is important,
> > but introduces a warning which is giving Tvrtko trouble - see linux-mm
> > https://lore.kernel.org/linux-mm/1596edbb-02ad-6bdf-51b8-15c2d2e08b76@linux.intel.com/
> > 
> > We already have the fix for the warning, it's making its way through the
> > system, and is marked for stable, but it has not reached Linus's tree yet.
> > 
> > Please drop this 19/20 from 6.0.4, then I'll reply to this to let you know
> > when the fix does reach Linus's tree - hopefully the two can go together
> > in the next 6.0-stable.
> > 
> > I apologize for not writing yesterday: gmail had gathered together
> > different threads with the same subject, I thought you and stable
> > were Cc'ed on the linux-mm mail and you would immediately drop it
> > yourself, but in fact you were not on that thread at all.
> 
> No worries, now dropped, thanks.

Thanks Greg.  Linus's tree now contains my fix
5aae9265ee1a ("mm: prep_compound_tail() clear page->private")
to Mel's fix
71e2d666ef85 ("mm/huge_memory: do not clobber swp_entry_t during THP split")
so they can now go on together into 6.0 stable.

They would also have been good in 5.19 stable: but too late now, it's EOL.

Hugh