Re: [PATCH 4/4] ioctl_userfaultfd.2: Add write-protect mode docs

Peter Xu
2021-03-04T16:15:16Z

On Wed, Mar 03, 2021 at 08:59:47PM -0500, Peter Xu wrote:
> Userfaultfd write-protect mode is supported starting from Linux 5.7.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
> man2/ioctl_userfaultfd.2 | 74 +++++++++++++++++++++++++++++++++++++---
> 1 file changed, 70 insertions(+), 4 deletions(-)
>
> diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
> index 1965d1932..3feb888a8 100644
> --- a/man2/ioctl_userfaultfd.2
> +++ b/man2/ioctl_userfaultfd.2
> @@ -208,10 +208,11 @@ signal will be sent to the faulting process.
> Applications using this
> feature will not require the use of a userfaultfd monitor for processing
> memory accesses to the regions registered with userfaultfd.
> +.TP
> .BR UFFD_FEATURE_THREAD_ID " (since Linux 4.14)"
> If this feature bit is set,
> .I uffd_msg.pagefault.feat.ptid
> -Will be set
> +will be set to the faulted thread ID for each page fault message.

These two changes should belong to the previous patch - will get them fixed
too.

--
Peter Xu