linux-kernel - Re: [PATCH v5 0/5] mm/hugetlb: Early cow on fork, and a few cleanups

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Message-ID: <20210302003035.GE444867@ziepe.ca>
Date:   Mon, 1 Mar 2021 20:30:35 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Peter Xu <peterx@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Gal Pressman <galpress@...zon.com>,
        Matthew Wilcox <willy@...radead.org>,
        Wei Zhang <wzam@...zon.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Jann Horn <jannh@...gle.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Kirill Shutemov <kirill@...temov.name>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrea Arcangeli <aarcange@...hat.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v5 0/5] mm/hugetlb: Early cow on fork, and a few cleanups

On Mon, Mar 01, 2021 at 04:28:46PM -0800, Andrew Morton wrote:
> On Mon, 1 Mar 2021 09:11:51 -0500 Peter Xu <peterx@...hat.com> wrote:
> 
> > On Wed, Feb 17, 2021 at 06:35:42PM -0500, Peter Xu wrote:
> > > v5:
> > > - patch 4: change "int cow" into "bool cow"
> > > - collect r-bs for Jason
> > 
> > Andrew,
> > 
> > I just noticed 5.12-rc1 has released; is this series still possible to make it
> > for 5.12, or needs to wait for 5.13?
> > 
> 
> It has taken a while to settle down.  What is the case for
> fast-tracking it into 5.12?

IIRC hugetlb users and fork and DMA will get the unexpected VA
corruption that triggered all this work.

Jason