Re: Where did vm_operations_struct->unmap in 2.4.0 go?

[Daniel Phillips]

Keith Owens wrote:
> I want to completely remove this multi layered method for setting
> initialisation order and go back to basics.  I want the programmer to
> say "initialise E and F after G, H and I".  The kernel build system
> works out the directed graph of initialisation order then controls the
> execution of startup code to satisfy this graph.

I don't doubt you will come up with a workable solution at build time. 
However, working out a valid graph at execution time is trivial and
efficient, given a list of precedence relations of the kind you're
suggesting.  In fact you don't even have to work out the graph before
starting the initialization, it's also trivial to keep a count of
unsatisfied initialization conditions at the beginning of each
initialization sequence and block until the count goes to zero.  (In
essence, evaluate a priority sort on the fly.)

--
Daniel
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