Re: [PATCH v2 1/1] userfaultfd/sysctl: add vm.unprivileged_userfaultfd

[Xiaoming Ni]

On Tue, Mar 19, 2019 at 11:07:22AM +0800, Peter Xu wrote:
> Add a global sysctl knob "vm.unprivileged_userfaultfd" to control
> whether userfaultfd is allowed by unprivileged users.  When this is
> set to zero, only privileged users (root user, or users with the
> CAP_SYS_PTRACE capability) will be able to use the userfaultfd
> syscalls.

Hello
I am a bit confused about this patch, can you help to answer it.

Why the sysctl interface of fs/userfaultfd.c belongs to vm_table instead 
of fs_table ?

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cefdca0a86be517bc390fc4541e3674b8e7803b0

Thanks
Xiaoming Ni