linux-kernel - Re: [PATCH v3 00/10] userfaultfd: add minor fault handling for shmem

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Message-ID: <alpine.LSU.2.11.2104151203320.15150@eggly.anvils>
Date:   Thu, 15 Apr 2021 12:12:48 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Joe Perches <joe@...ches.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Peter Xu <peterx@...hat.com>, Shaohua Li <shli@...com>,
        Shuah Khan <shuah@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Wang Qing <wangqing@...o.com>, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        Brian Geffon <bgeffon@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Subject: Re: [PATCH v3 00/10] userfaultfd: add minor fault handling for
 shmem

On Thu, 15 Apr 2021, Axel Rasmussen wrote:

> Base
> ====
> 
> This series is based on (and therefore should apply cleanly to) the tag
> "v5.12-rc7-mmots-2021-04-11-20-49", additionally with Peter's selftest cleanup
> series applied first:
> 
> https://lore.kernel.org/patchwork/cover/1412450/
> 
> Changelog
> =========
> 
> v2->v3:
> - Picked up {Reviewed,Acked}-by's.
> - Reorder commits: introduce CONTINUE before MINOR registration. [Hugh, Peter]
> - Don't try to {unlock,put}_page an xarray value in shmem_getpage_gfp. [Hugh]
> - Move enum mcopy_atomic_mode forward declare out of CONFIG_HUGETLB_PAGE. [Hugh]
> - Keep mistakenly removed UFFD_USER_MODE_ONLY in selftest. [Peter]
> - Cleanup context management in self test (make clear implicit, remove unneeded
>   return values now that we have err()). [Peter]
> - Correct dst_pte argument to dst_pmd in shmem_mcopy_atomic_pte macro. [Hugh]
> - Mention the new shmem support feature in documentation. [Hugh]

I shall ignore this v3 completely: "git send-email" is a wonderful
tool for mailing out patchsets in quick succession, but I have not
yet mastered "git send-review" to do the thinking for me as quickly.

Still deliberating on 4/9 and 9/9 of v2: they're very close,
but raise userfaultfd questions I still have to answer myself.

Hugh