Re: [PATCH 1/2] ioctl_userfaultfd.2: add UFFD_FEATURE_EXACT_ADDRESS

["Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>]

Hi Nadav,

On 3/7/22 19:48, Nadav Amit wrote:
> From: Nadav Amit <namit@vmware.com>
> 
> Describe the new UFFD_FEATURE_EXACT_ADDRESS API feature.
> 
> Signed-off-by: Nadav Amit <namit@vmware.com>
> ---

LGTM.  Please ping when it's added to Linus's tree,
and add a comment with the commit message that added it.

Thanks,

Alex

>  man2/ioctl_userfaultfd.2 | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
> index 504f61d4b..94480158e 100644
> --- a/man2/ioctl_userfaultfd.2
> +++ b/man2/ioctl_userfaultfd.2
> @@ -214,6 +214,14 @@ memory accesses to the regions registered with userfaultfd.
>  If this feature bit is set,
>  .I uffd_msg.pagefault.feat.ptid
>  will be set to the faulted thread ID for each page-fault message.
> +.TP
> +.BR UFFD_FEATURE_EXACT_ADDRESS " (since Linux 5.18)"
> +If this feature bit is set,
> +.I uffd_msg.pagefault.address
> +will be set to the exact page-fault address that was reported by the hardware,
> +and will not mask the offset within the page.
> +Note that old Linux versions might indicate the exact address as well,
> +even though the feature bit is not set.
>  .PP
>  The returned
>  .I ioctls

-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/