From: Mike Rapoport <rppt@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH] userfaultfd: replace ENOSPC with ESRCH in case mm has gone during copy/zeropage
Date: Tue, 8 Aug 2017 09:08:17 +0300 [thread overview]
Message-ID: <20170808060816.GA31648@rapoport-lnx> (raw)
In-Reply-To: <1502111545-32305-1-git-send-email-rppt@linux.vnet.ibm.com>
(adding Michal)
On Mon, Aug 07, 2017 at 04:12:25PM +0300, Mike Rapoport wrote:
> When the process exit races with outstanding mcopy_atomic, it would be
> better to return ESRCH error. When such race occurs the process and it's mm
> are going away and returning "no such process" to the uffd monitor seems
> better fit than ENOSPC.
>
> Suggested-by: Michal Hocko <mhocko@suse.com>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> Cc: Pavel Emelyanov <xemul@virtuozzo.com>
> Cc: Mike Kravetz <mike.kravetz@oracle.com>
> Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
> ---
> The man-pages update is ready and I'll send it out once the patch is
> merged.
>
> fs/userfaultfd.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
> index 06ea26b8c996..b0d5897bc4e6 100644
> --- a/fs/userfaultfd.c
> +++ b/fs/userfaultfd.c
> @@ -1600,7 +1600,7 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx,
> uffdio_copy.len);
> mmput(ctx->mm);
> } else {
> - return -ENOSPC;
> + return -ESRCH;
> }
> if (unlikely(put_user(ret, &user_uffdio_copy->copy)))
> return -EFAULT;
> @@ -1647,7 +1647,7 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx,
> uffdio_zeropage.range.len);
> mmput(ctx->mm);
> } else {
> - return -ENOSPC;
> + return -ESRCH;
> }
> if (unlikely(put_user(ret, &user_uffdio_zeropage->zeropage)))
> return -EFAULT;
> --
> 2.7.4
>
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2017-08-08 6:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 13:12 [PATCH] userfaultfd: replace ENOSPC with ESRCH in case mm has gone during copy/zeropage Mike Rapoport
2017-08-08 6:08 ` Mike Rapoport [this message]
2017-08-10 9:33 ` Michal Hocko
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