Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 1 Mar 2021 20:30:35 -0400
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Peter Xu <peterx@redhat.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Gal Pressman <galpress@amazon.com>,
        Matthew Wilcox <willy@infradead.org>,
        Wei Zhang <wzam@amazon.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Christoph Hellwig <hch@lst.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Gibson <david@gibson.dropbear.id.au>,
        Jann Horn <jannh@google.com>,
        Kirill Tkhai <ktkhai@virtuozzo.com>,
        Kirill Shutemov <kirill@shutemov.name>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Andrea Arcangeli <aarcange@redhat.com>, Jan Kara <jack@suse.cz>
Subject: Re: [PATCH v5 0/5] mm/hugetlb: Early cow on fork, and a few cleanups
Message-ID: <20210302003035.GE444867@ziepe.ca>
References: <20210217233547.93892-1-peterx@redhat.com>
 <20210301141151.GA397383@xz-x1>
 <20210301162846.c1f684a5662d37bbec3f1892@linux-foundation.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210301162846.c1f684a5662d37bbec3f1892@linux-foundation.org>
Precedence: bulk

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@redhat.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