Re: HAVE or ARCH_HAS or ARCH_SUPPORTS and use of select

[Sam Ravnborg <sam@ravnborg.org>]

On Thu, Nov 15, 2007 at 07:21:51AM -0500, Mathieu Desnoyers wrote:
> 
> FWIW, I've used "NEED_*" in my LTTng patchset to specify when an
> architecture needs support from an architecture independent module. (it
> could be an alternative to USE_*).

The situations we need to cover are:

1) An architecture uses or support a generic implementation
   Examples: KPROBES, GENERIC_TIME

2) An architecture uses a specific functionality
   Examples: MMU

3) Architecture provide a specific functionality
   Examples: ARCH_HAS_ILOG2_U32, ARCH_HAS_ILOG2_U64

4) A driver is supported by a subset of the architectures
   Example: config EDAC
                   depends on X86 || PPC


I'm very tempted to go with the suggestion of Russell and
say that the naming is the very generic:
HAVE_<config-symbol>

We know it from the auto-tools (albeit that could be a reason to avoid it)
And we can hardly put wrong interpretations in the HAVE_ thing.

	Sam