On Sat, Aug 31, 2013 at 04:35:03PM -0400, Steven Rostedt wrote:
> On Sat, 2013-08-31 at 12:46 -0700, Paul E. McKenney wrote:
>
> > > void arch_ftrace_update_code(int command);
> > > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> > > index 06504b2..be87ac9 100644
> > > --- a/kernel/trace/ftrace.c
> > > +++ b/kernel/trace/ftrace.c
> > > @@ -2645,7 +2645,10 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
> > > !ftrace_lookup_ip(ops->notrace_hash, rec->ip)) ||
> > >
> > > ((iter->flags & FTRACE_ITER_ENABLED) &&
> > > - !(rec->flags & FTRACE_FL_ENABLED))) {
> > > + !(rec->flags & FTRACE_FL_ENABLED)) ||
> > > +
> >
> > OK, I'll bite... Why the blank line?
>
> For readability. Here's the full if statement:
>
> if (((iter->flags & FTRACE_ITER_FILTER) &&
> !(ftrace_lookup_ip(ops->filter_hash, rec->ip))) ||
>
> ((iter->flags & FTRACE_ITER_NOTRACE) &&
> !ftrace_lookup_ip(ops->notrace_hash, rec->ip)) ||
>
> ((iter->flags & FTRACE_ITER_ENABLED) &&
> !(rec->flags & FTRACE_FL_ENABLED)) ||
>
> ((iter->flags & FTRACE_ITER_UNSAFE_ONLY) &&
> !ftrace_lookup_ip(ftrace_unsafe_rcu, rec->ip)) ||
>
> ((iter->flags & FTRACE_ITER_NO_UNSAFE) &&
> ftrace_lookup_ip(ftrace_unsafe_rcu, rec->ip))) {
>
>
> They are grouped in pairs.
Fair enough!
Thanx, Paul
> -- Steve
>
> >
> > Thanx, Paul
> >
> > > + ((iter->flags & FTRACE_ITER_NO_UNSAFE) &&
> > > + ftrace_lookup_ip(ftrace_unsafe_rcu, rec->ip))) {
> > >
> > > rec = NULL;
> > > goto retry;
> > > @@ -2773,6 +2776,7 @@ ftrace_avail_open(struct inode *inode, struct file
> > > *file)
> > > iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter));
> > > if (iter) {
> > > iter->pg = ftrace_pages_start;
> > > + iter->flags = FTRACE_ITER_NO_UNSAFE;
> > > iter->ops = &global_ops;
> > > }
> > >
> > > --
> > > 1.7.10.4
> > >
> > >
>
>
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