Re: [PATCH v12 3/3] tracing: Centralize preemptirq tracepoints and unify their usage

From: Steven Rostedt
Date: Wed Aug 08 2018 - 12:24:10 EST

On Wed, 8 Aug 2018 09:02:43 -0700
"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> > Which leaves us with sparc, arm, mips, sh and powerpc.
> >
> > sh is almost dead, and powerpc can be fixed, which I guess leaves us
> > with sparc, arm and mips.
> If we want to stick with the current srcu_read_lock() and srcu_read_unlock(),
> you mean? I would like that sort of outcome, at least assuming we are not
> hammering any of the architectures.

I would go with the local_inc approach, and even add a
srcu_read_un/lock_nmi() that does that if you want. Probably should add
lockdep to detect if the _nmi calls is ever used along with non _nmi
calls and complain about that.

But this will be something for the next merge window, not the one
coming up.

-- Steve