Re: [RFC v3 07/13] tables.h: add linker table support

Luis R. Rodriguez
2016-07-27T23:02:20Z

On Tue, Jul 26, 2016 at 12:30:14AM +0900, Masami Hiramatsu wrote:
> On Fri, 22 Jul 2016 14:24:41 -0700
> "Luis R. Rodriguez" <mcgrof@kernel.org> wrote:
>
> > +/**
> > + * LINKTABLE_RUN_ALL - iterate and run through all entries on a linker table
> > + *
> > + * @tbl: linker table
> > + * @func: structure name for the function name we want to call.
> > + * @args...: arguments to pass to func
> > + *
> > + * Example usage:
> > + *
> > + * LINKTABLE_RUN_ALL(frobnicator_fns, some_run,);
> > + */
> > +#define LINKTABLE_RUN_ALL(tbl, func, args...) \
> > +do { \
> > + size_t i; \
> > + for (i = 0; i < LINUX_SECTION_SIZE(tbl); i++) \
> > + (tbl[i]).func (args); \
> > +} while (0);
> > +
> > +/**
> > + * LINKTABLE_RUN_ERR - run each linker table entry func and return error if any
> > + *
> > + * @tbl: linker table
> > + * @func: structure name for the function name we want to call.
> > + * @args...: arguments to pass to func
> > + *
> > + * Example usage:
> > + *
> > + * unsigned int err = LINKTABLE_RUN_ERR(frobnicator_fns, some_run,);
> > + */
> > +#define LINKTABLE_RUN_ERR(tbl, func, args...) \
> > +({ \
> > + size_t i; \
> > + int err = 0; \
> > + for (i = 0; !err && i < LINUX_SECTION_SIZE(tbl); i++) \
> > + err = (tbl[i]).func (args); \
> > + err; \
> > +})
>
> These iteration APIs are a bit dangerous, at least for these APIs we'd better change
> name like as FUNCTABLE_RUN etc. because LINKTABLE can contain not only function address
> but also some data (or address of data).

Sure will do, thanks for the review.

Luis