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* to build kernel for powermac G5

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with PREEMPT_NONE

o arch/powerpc/kernel/head_64.S
  include/asm-generic/bug.h: Assembler messages:
  include/asm-generic/bug.h:19: Error: Unrecognized opcode: `extern'

o missing percpu related macros
  arch/powerpc/mm/mem.c
  In file included from include/asm/tlb.h:53,
                 from arch/powerpc/mm/mem.c:45:
  include/asm-generic/tlb.h:50: error: parse error before "mmu_gathers"
  include/asm-generic/tlb.h:50: warning: type defaults to `int' in
  declaration of `DECLARE_PER_CPU_LOCKED'
  etc.

o kernel/time/clockevents.c:82: error: conflicting types for 'timer_interrupt'
  include/asm/hw_irq.h:14: error: previous declaration of 'timer_interrupt' was here
  kernel/time/clockevents.c:82: error: conflicting types for 'timer_interrupt'
  include/asm/hw_irq.h:14: error: previous declaration of 'timer_interrupt' was here

o kernel/built-in.o: In function `do_gettimeofday':
    : multiple definition of `do_gettimeofday'
  arch/powerpc/kernel/built-in.o:: first defined here
  kernel/built-in.o: In function `.do_gettimeofday':
    : multiple definition of `.do_gettimeofday'
  arch/powerpc/kernel/built-in.o:: first defined here
  /usr/local/sti/SDK0.29/bin/pu64-ld: Warning: size of symbol
  `.do_gettimeofday' changed from 120 in arch/powerpc/kernel/built-in.o
    to 372 in kernel/built-in.o
  arch/powerpc/kernel/built-in.o: In function `.do_gettimeofday':

o arch/powerpc/kernel/built-in.o: In function `.do_gettimeofday':
  : undefined reference to `.SCALE_XSEC'

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with PREEMPT_RT

o arch/powerpc/platforms/powermac/.tmp_feature.o
  arch/powerpc/platforms/powermac/feature.c
  arch/powerpc/platforms/powermac/feature.c:65: error: conflicting types
  for 'feature_lock'
  include/asm/pmac_feature.h:381: error: previous declaration of
    'feature_lock' was here
  arch/powerpc/platforms/powermac/feature.c:65: error: conflicting types
    for 'feature_lock'
  include/asm/pmac_feature.h:381: error: previous declaration of
    'feature_lock' was here

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* to build for cell

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with PREEMPT_NONE
  OK

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with PREEMPT_RT
  OK
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