Re: [Qemu-devel] [RFC v1 PATCH 2/3] cpus: Convert cpu_index into a bitmap

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

On Fri, May 08, 2015 at 11:57:40AM -0300, Eduardo Habkost wrote:
> On Fri, May 08, 2015 at 03:21:35PM +0530, Bharata B Rao wrote:
> [...]
> >  void cpu_exec_init(CPUArchState *env, Error **errp)
> >  {
> >      CPUState *cpu = ENV_GET_CPU(env);
> >      CPUClass *cc = CPU_GET_CLASS(cpu);
> > -    CPUState *some_cpu;
> >      int cpu_index;
> > -
> >  #if defined(CONFIG_USER_ONLY)
> > +    CPUState *some_cpu;
> > +
> >      cpu_list_lock();
> > -#endif
> >      cpu_index = 0;
> >      CPU_FOREACH(some_cpu) {
> >          cpu_index++;
> >      }
> >      cpu->cpu_index = cpu_index;
> 
> Why not use the bitmap on CONFIG_USER too?

I was doing like that in v1 and it required me to cook up a max_cpus value
for CONFIG_USER case to define the bitmap.

Andreas pointed out that it is better not to touch the allocation
logic for CONFIG_USER.

https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg03571.html

Regards,
Bharata.