[PATCH 4/6] ARM: smp: set thread_info->cpu to hardware CPU number for boot thread

[Stephen Boyd]

On 08/08/2011 10:10 AM, Will Deacon wrote:
>
>  
> +void __init smp_setup_processor_id(void)
> +{
> +	u32 mpidr;
> +
> +	/* Read the MPIDR to find the hardware ID of the current CPU. */
> +	asm("1:		mrc	p15, 0, %0, c0, c0, 5\n"
> +	    "		.pushsection \".alt.smp.init\", \"a\"\n"
> +	    "		.long	1b\n"
> +	    "		mov	%0, #0\n"
> +	    "		.popsection"
> +	    : "=r" (mpidr));

Would it be a good idea to put this into asm/cputype.h? I suppose the
smp alternatives part would need to be written in C.

    mpidr = is_smp() ? read_cpuid_mpidr() : 0;

>
> +
> +	current_thread_info()->cpu = mpidr & 0xff;
> +	printk("Booting Linux on CPU %d\n", current_thread_info()->cpu);
> +}
> +

Should there be a KERN_INFO there?

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
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