Re: [RFC PATCH 07/10] ARM: sched: Setup SCHED_HMP domains

[Morten Rasmussen <Morten.Rasmussen@arm.com>]

On Thu, Oct 04, 2012 at 07:58:45AM +0100, Viresh Kumar wrote:
> On 22 September 2012 00:02,  <morten.rasmussen@arm.com> wrote:
> > diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> 
> > +void __init arch_get_hmp_domains(struct list_head *hmp_domains_list)
> > +{
> > +       struct cpumask hmp_fast_cpu_mask;
> > +       struct cpumask hmp_slow_cpu_mask;
> 
> can be merged to single line.
> 
> > +       struct hmp_domain *domain;
> > +
> > +       arch_get_fast_and_slow_cpus(&hmp_fast_cpu_mask, &hmp_slow_cpu_mask);
> > +
> > +       /*
> > +        * Initialize hmp_domains
> > +        * Must be ordered with respect to compute capacity.
> > +        * Fastest domain at head of list.
> > +        */
> > +       domain = (struct hmp_domain *)
> > +               kmalloc(sizeof(struct hmp_domain), GFP_KERNEL);
> 
> should be:
> 
> domain = kmalloc(sizeof(*domain), GFP_KERNEL);
> 
> > +       cpumask_copy(&domain->cpus, &hmp_slow_cpu_mask);
> 
> what if kmalloc failed?
> 
> > +       list_add(&domain->hmp_domains, hmp_domains_list);
> > +       domain = (struct hmp_domain *)
> > +               kmalloc(sizeof(struct hmp_domain), GFP_KERNEL);
> 
> would be better to kmalloc only once with size 2* sizeof(*domain)
> 
> > +       cpumask_copy(&domain->cpus, &hmp_fast_cpu_mask);
> > +       list_add(&domain->hmp_domains, hmp_domains_list);
> 
> Also would be better to create a macro for above two lines to remove
> code redundancy.
> 

Agree on all of the above.

Thanks,
Morten