Re: [kvm-unit-tests PATCH v2 4/7] s390x: smp: Rework cpu start and active tracking

[Cornelia Huck <cohuck@redhat.com>]

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On Thu, 16 Jan 2020 15:44:24 +0100
Janosch Frank <frankja@linux.ibm.com> wrote:

> On 1/16/20 3:14 PM, Cornelia Huck wrote:
> > On Thu, 16 Jan 2020 07:05:10 -0500
> > Janosch Frank <frankja@linux.ibm.com> wrote:

> >> +static int smp_cpu_restart_nolock(uint16_t addr, struct psw *psw)
> >> +{
> >> +	int rc;
> >> +	struct cpu *cpu = smp_cpu_from_addr(addr);
> >> +
> >> +	if (!cpu)
> >> +		return -1;
> >> +	if (psw) {
> >> +		cpu->lowcore->restart_new_psw.mask = psw->mask;
> >> +		cpu->lowcore->restart_new_psw.addr = psw->addr;
> >> +	}
> >> +	rc = sigp(addr, SIGP_RESTART, 0, NULL);
> >> +	if (rc)
> >> +		return rc;
> >> +	while (!smp_cpu_running(addr)) { mb(); }  
> > 
> > Maybe split this statement? Also, maybe add a comment  
> 
> /* Wait until the target cpu is running */
> ?

Fine with me as well :)

> 
> This is not QEMU with two line ifs taking up 3 lines :)

Heh, it's just the style I'm used to :)

> 
> > 
> > /*
> >  * The order has been accepted, but the actual restart may not
> >  * have been performed yet, so wait until the cpu is running.
> >  */
> > 
> > ?
> >   
> >> +	cpu->active = true;
> >> +	return 0;
> >> +}  
> > 
> > The changes look good to me AFAICS.
> > 
> > Reviewed-by: Cornelia Huck <cohuck@redhat.com>  
> 
> Thanks!
> 
> 


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