linux-kernel - Re: [PATCH v2] ioctl_userfaultfd.2, userfaultfd.2: add minor fault mode

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Message-ID: <YQA2SC4ecPh7cz7f@t490s>
Date:   Tue, 27 Jul 2021 12:37:28 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2] ioctl_userfaultfd.2, userfaultfd.2: add minor fault
 mode

On Fri, Jun 04, 2021 at 12:56:22PM -0700, Axel Rasmussen wrote:
> Userfaultfd minor fault mode is supported starting from Linux 5.13.
> 
> This commit adds a description of the new mode, as well as the new ioctl
> used to resolve such faults. The two go hand-in-hand: one can't resolve
> a minor fault without continue, and continue can't be used to resolve
> any other kind of fault.
> 
> This patch covers just the hugetlbfs implementation (in 5.13). Support
> for shmem is forthcoming, but as it has not yet made it into a kernel
> release candidate, it will be added in a future commit.
> 
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>

FWIW:

Reviewed-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu