[PATCH] of: Add missing node iteration stubs for disabled CONFIG_OF
Grant Likely
grant.likely at secretlab.ca
Tue Jun 11 17:51:47 EDT 2013
On Tue, 11 Jun 2013 17:22:55 +0100, Jonathan Austin <jonathan.austin at arm.com> wrote:
> Hi Rob, Thomasz,
>
> (dredging up an oldish thread as I just ran in to this issue)
>
> On 01/04/13 22:19, Rob Herring wrote:
> > On 03/09/2013 02:15 PM, Tomasz Figa wrote:
> >> This patch moves several for_each macros out of the #ifdef CONFIG_OF
> >> block and adds inline stubs for functions used by these macros, compiled
> >> conditionally when CONFIG_OF is not enabled.
> >>
> >> This eliminates the need to explicitly check for CONFIG_OF in driver
> >> code using mentioned functions and macros.
> >
> > Do you have some users of this?
>
> I do!
>
> Or at least I might.
>
> I'm not certain as perhaps the fix to what I describe below is to add
> dependencies on CONFIG_OF - it isn't clear to me either way:
>
> With both psci and arch_timers (CONFIG_ARM_PSCI, CONFIG_ARM_ARCH_TIMER)
> and without CONFIG_OF we get a build failure because we lack the definition
> of of_find_matching_node():
>
> eg:
> arch/arm/kernel/psci.c:167:2: error: implicit declaration of function ‘of_find_matching_node’ [-Werror=implicit-function-declaration]
>
> The same happens with arm_arch_timer.c (well, there's a patch required to
> include linux/of.h first, after which Thomasz's patch is relevant).
That code path is completely broken if CONFIG_OF is not set. psci_init()
is nothing but calls to CONFIG_OF infrastructure! I think that code
needs to depend on CONFIG_OF, or at least be wrapped with
"if (IS_ENABLED(CONFIG_OF))" if there are still usable parts when
CONFIG_OF is disabled. Frankly I don't see that as being a real concern.
That said, Arnd has posted a patch that moves at least some of the function
prototypes out from under the #ifdef block so that GCC can do syntax
checking on disabled code. That overlaps a bit with this patch.
Regardless, I'm not going to apply it without a legitimate (as opposed
to theoretical) user.
g.
> So, I guess the question is whether we should expect PSCI and ARM_ARCH_TIMER
> to depend on CONFIG_OF, or whether we'd like them to fail gracefully in the
> case that we *don't* have CONFIG_OF. I think the current situation is broken
> either way...
>
> Thoughts?
>
> Jonny
>
> >
> > Rob
> >
> >>
> >> Signed-off-by: Tomasz Figa <tomasz.figa at gmail.com>
> >> ---
> >> include/linux/of.h | 92 +++++++++++++++++++++++++++++++++++++-----------------
> >> 1 file changed, 63 insertions(+), 29 deletions(-)
> >>
> >> diff --git a/include/linux/of.h b/include/linux/of.h
> >> index a0f1292..7a736b8 100644
> >> --- a/include/linux/of.h
> >> +++ b/include/linux/of.h
> >> @@ -86,6 +86,31 @@ static inline struct device_node *of_node_get(struct device_node *node)
> >> static inline void of_node_put(struct device_node *node) { }
> >> #endif /* !CONFIG_OF_DYNAMIC */
> >>
> >> +#define for_each_node_by_name(dn, name) \
> >> + for (dn = of_find_node_by_name(NULL, name); dn; \
> >> + dn = of_find_node_by_name(dn, name))
> >> +#define for_each_node_by_type(dn, type) \
> >> + for (dn = of_find_node_by_type(NULL, type); dn; \
> >> + dn = of_find_node_by_type(dn, type))
> >> +#define for_each_compatible_node(dn, type, compatible) \
> >> + for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
> >> + dn = of_find_compatible_node(dn, type, compatible))
> >> +#define for_each_matching_node(dn, matches) \
> >> + for (dn = of_find_matching_node(NULL, matches); dn; \
> >> + dn = of_find_matching_node(dn, matches))
> >> +#define for_each_matching_node_and_match(dn, matches, match) \
> >> + for (dn = of_find_matching_node_and_match(NULL, matches, match); \
> >> + dn; dn = of_find_matching_node_and_match(dn, matches, match))
> >> +#define for_each_child_of_node(parent, child) \
> >> + for (child = of_get_next_child(parent, NULL); child != NULL; \
> >> + child = of_get_next_child(parent, child))
> >> +#define for_each_available_child_of_node(parent, child) \
> >> + for (child = of_get_next_available_child(parent, NULL); child != NULL; \
> >> + child = of_get_next_available_child(parent, child))
> >> +#define for_each_node_with_property(dn, prop_name) \
> >> + for (dn = of_find_node_with_property(NULL, prop_name); dn; \
> >> + dn = of_find_node_with_property(dn, prop_name))
> >> +
> >> #ifdef CONFIG_OF
> >>
> >> /* Pointer for first entry in chain of all nodes. */
> >> @@ -167,19 +192,10 @@ static inline const char *of_node_full_name(const struct device_node *np)
> >>
> >> extern struct device_node *of_find_node_by_name(struct device_node *from,
> >> const char *name);
> >> -#define for_each_node_by_name(dn, name) \
> >> - for (dn = of_find_node_by_name(NULL, name); dn; \
> >> - dn = of_find_node_by_name(dn, name))
> >> extern struct device_node *of_find_node_by_type(struct device_node *from,
> >> const char *type);
> >> -#define for_each_node_by_type(dn, type) \
> >> - for (dn = of_find_node_by_type(NULL, type); dn; \
> >> - dn = of_find_node_by_type(dn, type))
> >> extern struct device_node *of_find_compatible_node(struct device_node *from,
> >> const char *type, const char *compat);
> >> -#define for_each_compatible_node(dn, type, compatible) \
> >> - for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
> >> - dn = of_find_compatible_node(dn, type, compatible))
> >> extern struct device_node *of_find_matching_node_and_match(
> >> struct device_node *from,
> >> const struct of_device_id *matches,
> >> @@ -190,12 +206,6 @@ static inline struct device_node *of_find_matching_node(
> >> {
> >> return of_find_matching_node_and_match(from, matches, NULL);
> >> }
> >> -#define for_each_matching_node(dn, matches) \
> >> - for (dn = of_find_matching_node(NULL, matches); dn; \
> >> - dn = of_find_matching_node(dn, matches))
> >> -#define for_each_matching_node_and_match(dn, matches, match) \
> >> - for (dn = of_find_matching_node_and_match(NULL, matches, match); \
> >> - dn; dn = of_find_matching_node_and_match(dn, matches, match))
> >> extern struct device_node *of_find_node_by_path(const char *path);
> >> extern struct device_node *of_find_node_by_phandle(phandle handle);
> >> extern struct device_node *of_get_parent(const struct device_node *node);
> >> @@ -207,14 +217,6 @@ extern struct device_node *of_get_next_available_child(
> >>
> >> extern struct device_node *of_get_child_by_name(const struct device_node *node,
> >> const char *name);
> >> -#define for_each_child_of_node(parent, child) \
> >> - for (child = of_get_next_child(parent, NULL); child != NULL; \
> >> - child = of_get_next_child(parent, child))
> >> -
> >> -#define for_each_available_child_of_node(parent, child) \
> >> - for (child = of_get_next_available_child(parent, NULL); child != NULL; \
> >> - child = of_get_next_available_child(parent, child))
> >> -
> >> static inline int of_get_child_count(const struct device_node *np)
> >> {
> >> struct device_node *child;
> >> @@ -228,10 +230,6 @@ static inline int of_get_child_count(const struct device_node *np)
> >>
> >> extern struct device_node *of_find_node_with_property(
> >> struct device_node *from, const char *prop_name);
> >> -#define for_each_node_with_property(dn, prop_name) \
> >> - for (dn = of_find_node_with_property(NULL, prop_name); dn; \
> >> - dn = of_find_node_with_property(dn, prop_name))
> >> -
> >> extern struct property *of_find_property(const struct device_node *np,
> >> const char *name,
> >> int *lenp);
> >> @@ -353,13 +351,28 @@ static inline struct device_node *of_find_node_by_name(struct device_node *from,
> >> return NULL;
> >> }
> >>
> >> +static inline struct device_node *of_find_node_by_type(struct device_node *from,
> >> + const char *type)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> static inline bool of_have_populated_dt(void)
> >> {
> >> return false;
> >> }
> >>
> >> -#define for_each_child_of_node(parent, child) \
> >> - while (0)
> >> +static inline struct device_node *of_get_next_child(const struct device_node *node,
> >> + struct device_node *prev)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> +static inline struct device_node *of_get_next_available_child(
> >> + const struct device_node *node, struct device_node *prev)
> >> +{
> >> + return NULL;
> >> +}
> >>
> >> static inline struct device_node *of_get_child_by_name(
> >> const struct device_node *node,
> >> @@ -373,6 +386,12 @@ static inline int of_get_child_count(const struct device_node *np)
> >> return 0;
> >> }
> >>
> >> +static inline struct device_node *of_find_node_with_property(
> >> + struct device_node *from, const char *prop_name)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> static inline int of_device_is_compatible(const struct device_node *device,
> >> const char *name)
> >> {
> >> @@ -394,6 +413,21 @@ static inline struct device_node *of_find_compatible_node(
> >> return NULL;
> >> }
> >>
> >> +static inline struct device_node *of_find_matching_node_and_match(
> >> + struct device_node *from,
> >> + const struct of_device_id *matches,
> >> + const struct of_device_id **match)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> +static inline struct device_node *of_find_matching_node(
> >> + struct device_node *from,
> >> + const struct of_device_id *matches)
> >> +{
> >> + return NULL;
> >> +}
> >> +
> >> static inline int of_property_read_u8_array(const struct device_node *np,
> >> const char *propname, u8 *out_values, size_t sz)
> >> {
> >>
> >
> >
> > _______________________________________________
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> > linux-arm-kernel at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
>
>
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--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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