This patch cleans up the per-CPU MCA mess with the following changes
(and yields a UP kernel that actually boots again):

 - In percpu.h, make per_cpu_init() a function-call even for the
   UP case.
 - In contig.c, enable per_cpu_init() even for UP since we need to
   allocate the per-CPU MCA data in that case as well.
 - Move the MCA-related stuff out of the cpuinfo structure into
   per-CPU variables defined by mca.c.
 - Rename IA64_KR_PA_CPU_INFO to IA64_KR_PER_CPU_DATA, since it really
   is a per-CPU pointer now.
 - In mca.h, move IA64_MCA_STACK_SIZE early enough so it gets defined
   for assembly-code, too.  Tidy up struct ia64_mca_struct.  Add declaration
   of ia64_mca_cpu_init().
 - In mca_asm.[hS], replace various GET_*() macros with a single
   GET_PERCPU_ADDR() which loads the physical address of an
   arbitrary per-CPU variable.  Remove all dependencies on the
   layout of the cpuinfo structure.  Replace hardcoded stack-size
   with IA64_MCA_STACK_SIZE constant.  Replace hardcoded references
   to ar.k3 with IA64_KR(PER_CPU_DATA).
 - In setup.c:cpu_init(), initialize ar.k3 to be the physical equivalent
   of the per-CPU data pointer.
 - Nuke silly ia64_mca_cpu_t typedef and just use struct ia64_mca_cpu instead.
 - Move __per_cpu_mca[] from setup.c to mca.c.
 - Rename set_mca_pointer() to ia64_mca_cpu_init() and sanitize it.
 - Rename efi.c:pal_code_memdesc() to efi_get_pal_addr() and make it
   return the PAL address, rather than a memory-descriptor.
 - Make efi_map_pal_code() use efi_get_pal_addr().
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>