Re: [RFC 1/3] x86/vdso: create vdso file, use it for mapping

[Andy Lutomirski]

On Thu, Aug 25, 2016 at 8:21 AM, Dmitry Safonov <dsafonov@xxxxxxxxxxxxx> wrote:
> I added here a new in-kernel fs with ramfs-like options.
> Created vdso file in this fs (yet for testing, only 64-bit vdso).
> Mapped this file to process's mm on setup_additional_pages.
> Just for testing purpose it's done only for specific UID.

I'm wondering whether all this code could be easily moved into the
core special mapping helpers so that all special mappings get the same
benefit.  We could embed a struct file * (or struct inode or whatever)
in special_mapping if needed.

Also, could this be simplified to use anon_inode?

(I'm not a VFS expert at all, so I could be way off base.)