On Fri, 6 Aug 2010, Russell King - ARM Linux wrote:
> On Fri, Aug 06, 2010 at 01:02:24PM +0300, Ohad Ben-Cohen wrote:
> > We have Russell's suggestion which is nice and simple, but it has the
> > 1 device limitation.
>
> You could make it generic by doing something like this:
>
> #define set_device_data(name, type, index, data) \
> ({ \
> extern void __set_device_data(const char *, int, void *, size_t); \
> BUILD_BUG_ON(!__same_type(type, *data)); \
> __set_device_data(name ":" #type, index, data, sizeof(type)); \
> })
>
> #define get_device_data(name, type, index) ({ \
> extern void *__get_device_data(const char *, int); \
> type *__ptr = __get_device_data(name ":" #type, index); \
> __ptr; })
>
> And now we have something that takes a string and index to use as a lookup
> key in some kind of list - and it's typesafe (because the lookup key is
> dependent on the stringified type.)
>
> But... at this point I feel that we're getting too complicated, and will
> get shouted at to use something like DT which already solves this problem.
DT is not generally available yet. A simple interim solution would
still be worth it.
Nicolas
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