On Sun, 28 Jan 2024 15:11:01 -0600 David Lechner <dlechner@xxxxxxxxxxxx> wrote: > On Sun, Jan 28, 2024 at 10:06 AM Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > > > > From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > > > > To avoid issues with out of order cleanup, or ambiguity about when the > > auto freed data is first instantiated, do it within the for loop definition. > > > > The disadvantage is that the struct device_node *child variable creation > > is not immediately obvious where this is used. > > However, in many cases, if there is another definition of > > struct device_node *child; the compiler / static analysers will notify us > > that it is unused, or uninitialized. > > > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > > --- > > include/linux/of.h | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git a/include/linux/of.h b/include/linux/of.h > > index 50e882ee91da..f822226eac6d 100644 > > --- a/include/linux/of.h > > +++ b/include/linux/of.h > > @@ -1434,6 +1434,12 @@ static inline int of_property_read_s32(const struct device_node *np, > > for (child = of_get_next_available_child(parent, NULL); child != NULL; \ > > child = of_get_next_available_child(parent, child)) > > > > +#define for_each_child_of_node_scoped(parent, child) \ > > + for (struct device_node *child __free(device_node) = \ > > + of_get_next_child(parent, NULL); \ > > + child != NULL; \ > > + child = of_get_next_available_child(parent, child)) > > Doesn't this need to match the initializer (of_get_next_child)? > Otherwise it seems like the first node could be a disabled node but no > other disabled nodes would be included in the iteration. FwIW that was was entirely unintentional. Not sure how it happened :( Anyhow, now will be for_each_available_child_of_node_scoped() with the right first call. > > It seems like we would want two macros, one for each variation, > analogous to for_each_child_of_node() and > for_each_available_child_of_node(). > > > > + > > #define for_each_of_cpu_node(cpu) \ > > for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \ > > cpu = of_get_next_cpu_node(cpu)) > > -- > > 2.43.0 > > > >
