[PATCH RFC] ppc: fix default_machine_crash_shutdown #ifdef botch

[Michael Neuling]

In message <20100616004839.GA18110 at linux.vnet.ibm.com> you wrote:
> crash_kexec_wait_realmode() is defined only if CONFIG_PPC_STD_MMU_64
> and CONFIG_SMP, but is called if CONFIG_PPC_STD_MMU_64 even if !CONFIG_SMP.
> Fix the conditional compilation around the invocation.
> 
> Untested, probably does not compile.
> 
> Signed-off-by: Paul E. McKenney <paulmck at linux.vnet.ibm.com>

This should be right since we don't need to wait for the other CPUs if
there are no others... 

Compiles for me and even fixes the SMP=N case.  Thanks!

Acked-by: Michael Neuling <mikey at neuling.org>

> ---
> 
> diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
> index b46f2e0..29df48f 100644
> --- a/arch/powerpc/kernel/crash.c
> +++ b/arch/powerpc/kernel/crash.c
> @@ -447,7 +447,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
>  	crash_kexec_prepare_cpus(crashing_cpu);
>  	cpu_set(crashing_cpu, cpus_in_crash);
>  	crash_kexec_stop_spus();
> -#ifdef CONFIG_PPC_STD_MMU_64
> +#if defined(CONFIG_PPC_STD_MMU_64) && defined(CONFIG_SMP)
>  	crash_kexec_wait_realmode(crashing_cpu);
>  #endif
>  	if (ppc_md.kexec_cpu_down)
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