Re: [PATCH] ftrace: Remove possible deadlock between register_kprobe() and ftrace_run_update_code()

[Jiri Kosina]

On Thu, 27 Jun 2019, Josh Poimboeuf wrote:

> > How is that supposed to work?
> > 
> >     ftrace  	     	
> > 	prepare()
> > 	 setrw()
> > 			setro()
> > 	patch <- FAIL
> 
> /me dodges frozen shark
> 
> You are right of course.  My brain has apparently already shut off for
> the day.
> 
> Maybe a comment or two would help though.

I'd actually prefer (perhaps in parallel to the comment) using the 
__acquires() and __releases() anotations, so that sparse and friends don't 
get confused by that either.

-- 
Jiri Kosina
SUSE Labs