Re: objtool clac/stac handling change..

[Al Viro]

On Thu, Jul 02, 2020 at 03:01:59PM +0100, Al Viro wrote:
> On Thu, Jul 02, 2020 at 11:34:31PM +1000, Michael Ellerman wrote:
> 
> > I think we can do something to make it work.
> > 
> > We don't have an equivalent of x86's ex_handler_uaccess(), so it's not
> > quite as easy as whacking a user_access_end() in there.
> > 
> > Probably the simplest option for us is to just handle it in our
> > unsafe_op_wrap(). I'll try and come up with something tomorrow.
> 
> The goal is to avoid using unsafe_op_wrap()...

Incidentally, the change Linus proposes would affect unsafe_put_user()
as well.  And you are not using unsafe_op_wrap() anywhere on that
path...