[PATCH 45/74] SPEAr : SEV Send event to secondary CPUs

[Russell King - ARM Linux]

On Mon, Aug 30, 2010 at 04:09:09PM +0530, Viresh KUMAR wrote:
> diff --git a/arch/arm/mach-spear13xx/include/mach/smp.h b/arch/arm/mach-spear13xx/include/mach/smp.h
> index 6e028a1..e2e55fc 100644
> --- a/arch/arm/mach-spear13xx/include/mach/smp.h
> +++ b/arch/arm/mach-spear13xx/include/mach/smp.h
> @@ -24,6 +24,12 @@
>  		cpunum &= 0x0F;				\
>  	})
>  
> +/*
> + * set_event() is used to wake up secondary core from wfe using sev. Booting
> + * code puts the second core into wfe(standby).
> + */
> +#define set_event()	__asm__ __volatile__ ("sev" : : : "memory")

This shouldn't be something that platforms define on their own.  Please
add a sev() macro to arch/arm/include/asm/system.h instead.  Also take a
look at arch/arm/mach-omap2/omap-smp.c for an alternative idea about how
to handle this.

Lastly, consider rolling the OMAP solution into the patch which adds SMP
support for spear13xx.