esi-support (2nd take)

Hi Tony,

Below is a revised version of the ESI-support patch with the following changes:

 * Export ia64_esi_call and ia64_esi_call_phys() as GPL symbols.

 * Disallow building esi.c as a module for now.  Building as a module
would currently
   lead to an unresolved reference to "sal_lock" on SMP kernels
because that symbol
   doesn't get exported.  If it turns out that ESI calls can be locked
separately from
   SAL calls, we can replace sal_lock with a new esi_lock and reenable
building as
   a module (I'm checking into whether or not this is safe).

 * Export esi_call_phys() only if ESI is enabled.

 * Remove internal stuff from esi.h and add a "proc_type" argument to
ia64_esi_call() such
   that serialization-requirements can be expressed (ESI follows SAL
here, where procedure
   calls may have to be serialized, are MP-safe, or MP-safe andr reentrant).

Signed-off-by: David Mosberger <David.Mosberger@acm.org>

  --david
-- 
Mosberger Consulting LLC, http://www.mosberger-consulting.com/

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