linux-kernel - Re: [PATCH] of: support passing console options with stdout-path

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Date:	Tue, 25 Nov 2014 15:24:31 +0000
From:	Ian Campbell <ijc@...ian.org>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: Re: [PATCH] of: support passing console options with stdout-path

On Tue, 2014-11-25 at 15:20 +0000, Grant Likely wrote:
> On Tue, Nov 25, 2014 at 3:15 PM, Leif Lindholm <leif.lindholm@...aro.org> wrote:
> > On Tue, Nov 25, 2014 at 02:58:54PM +0000, Grant Likely wrote:
> >> > +           len = strchrnul(path, ':') - path;
> >> > +
> >> >             for_each_property_of_node(of_aliases, pp) {
> >> >                     if (strlen(pp->name) == len && !strncmp(pp->name, path, len)) {
> >> >                             np = of_find_node_by_path(pp->value);
> >>
> >> Can you add a testcase to drivers/of/unittests.c for this new path
> >> parsing? Then we know it's correct!
> >
> > Will do.
> >
> >> > @@ -1830,8 +1835,12 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
> >> >                     name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> >> >             if (IS_ENABLED(CONFIG_PPC) && !name)
> >> >                     name = of_get_property(of_aliases, "stdout", NULL);
> >> > -           if (name)
> >> > +           if (name) {
> >> >                     of_stdout = of_find_node_by_path(name);
> >> > +                   of_stdout_options = strchr(name, ':');
> >> > +                   if (of_stdout_options != NULL)
> >> > +                           of_stdout_options++;
> >> > +           }
> >>
> >> Not so good. The ':' should actually be a generic part of
> >> of_find_node_by_path(), it doesn't have to be limited to stdout parsing.
> >> There are other places that would use it. I would add a second,
> >> optional, argument to of_find_node_by_path() that will update a pointer
> >> to the arguments after the ':'.
> >
> > So, I agree this would be nicer...
> >
> > However, I'm counting 157 callers of this function outside of
> > drivers/of and 43 inside. Any chance you'd let me get away with a
> > separate of_find_extra_options_by_path()?
> 
> I'd rather not. It is a trivial change and can be pretty much done
> mechanically. Something like (I think; I always have to look up the
> sed syntax):
> 
> sed s/of_find_node_by_path\((.*)\)/of_find_node_by_path\(\1, NULL\)

Coccinelle rules for this sort of transformation...

Ian.

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