Re: [PATCH v6 01/12] tools lib traceevent: Convert remaining %p[fF] users to %p[sS]

Joe Perches
2019-09-10T18:42:15Z

On Tue, 2019-09-10 at 14:26 -0400, Steven Rostedt wrote:
> On Tue, 10 Sep 2019 10:18:44 -0700
> Joe Perches <joe@perches.com> wrote:
>
> > > It's not just for the lastest kernel. We must maintain backward
> > > compatibility here too. If there use to be a usage of this, then we
> > > must keep it until the kernels are no longer used (perhaps 7 years?)
> >
> > That argues for not using "%pfw" at all for some number of years.
> >
> > Perhaps the '%pfw' should be '%pnfw' for 'name' and 'fwnode'
>
> -ENOCOMPREHENSION

Perhaps you were not copied on the whole series.

https://lore.kernel.org/lkml/20190910084707.18380-1-sakari.ailus@linux.intel.com/

As I understand it, Sakair Ailus is proposing to
obsolete the current vsprintf "%p[Ff]" extension
and replace the usage with a new "%pfw" extension
which would emit the name of a pointer to "struct fwnode {}".

https://lore.kernel.org/lkml/20190910084707.18380-10-sakari.ailus@linux.intel.com/

If reusing "%pf<foo>" is a problem, then instead
it might be reasonable to have a new "%pn<foo>" for
that use instead.

btw:

Is there kernel version information available in
trace output files?

If so, it might be reasonable to change the tooling
there instead.