Re: [patch 1/2] Linux Kernel Markers - Support Multiple Probes

[Andrew Morton]

On Tue, 4 Dec 2007 14:21:00 -0500
Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx> wrote:

> > > + */
> > > +void marker_probe_cb(const struct marker *mdata, void *call_private,
> > > +	const char *fmt, ...)
> > > +{
> > > +	va_list args;
> > > +	char ptype;
> > > +
> > > +	preempt_disable();
> > 
> > What are the preempt_disable()s doing in here?
> > 
> > Unless I missed something obvious, a comment is needed here (at least).
> > 
> 
> They make sure the teardown of the callbacks can be done correctly when
> they are in modules and they insure RCU read coherency. Will add
> comment.

So shouldn't it be using rcu_read_lock()?  If that does not suit, should we
be adding new rcu primitives rather than open-coding and adding dependencies?
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