Re: [RFC PATCH 1/5] x86: introduce preemption disable prefix

[Alexei Starovoitov]

> 
> >
> > Another example is __BPF_PROG_RUN_ARRAY(), which also uses
> > preempt_enable_no_resched().
> 
> Alexei, I think this code is just wrong.

why 'just wrong' ?

> Do you know why it uses
> preempt_enable_no_resched()?

dont recall precisely.
we could be preemptable at the point where macro is called.
I think the goal of no_resched was to avoid adding scheduling points
where they didn't exist before just because a prog ran for few nsec.
May be Daniel or Roman remember.