[PATCH 3/9] ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP

[Eric W. Biederman]

Johannes Berg <johannes at sipsolutions.net> writes:

> On Tue, 2022-04-26 at 17:52 -0500, Eric W. Biederman wrote:
>> User mode linux is the last user of the PT_DTRACE flag.  Using the flag to indicate
>> single stepping is a little confusing and worse changing tsk->ptrace without locking
>> could potentionally cause problems.
>> 
>> So use a thread info flag with a better name instead of flag in tsk->ptrace.
>> 
>> Remove the definition PT_DTRACE as uml is the last user.
>
>
> Looks fine to me.
>
> Acked-by: Johannes Berg <johannes at sipsolutions.net>

Thanks.

> Looking at pending patches, I don't see any conflicts from this. I'm
> guessing anyway you'll want/need to take these through some tree all
> together.

Taking them all through a single tree looks like it will be easiest.
So I am planning on taking them through my signal tree.

Now that I think of it, the lack of locking also means I want to
Cc stable.

Eric