[Qemu-devel] Re: [patch 0/2] QEMU maxcpus support

[Avi Kivity <avi@redhat.com>]

On 06/23/2009 06:07 PM, Jes Sorensen wrote:
> On 06/23/2009 03:36 PM, Avi Kivity wrote:
>> On 06/23/2009 04:32 PM, Jes Sorensen wrote:
>>>> I should have said this at your previous post, but it only occurred to
>>>> me now: we could have -smp 4,maxcpus=65536 instead of a new parameter.
>>>
>>> We could do that too, but is it really worth it? It seems to me 
>>> -maxcpus
>>> is fine?
>>
>> The trend is to consolidate related options into a single option, -to
>> -avoid -command -lines -with -too -many -dashes.
>
> Ok, so how about this then?
>
>
>   DEF("smp", HAS_ARG, QEMU_OPTION_smp,
> -    "-smp n          set the number of CPUs to 'n' [default=1]\n")
> +    "-smp n,[maxcpus=cpus]\n"
>    

-smp n[,maxcpus=cpus]

> @@ -5550,12 +5551,29 @@ int main(int argc, char **argv, char **e
>                   usb_devices_index++;
>                   break;
>               case QEMU_OPTION_smp:
> -                smp_cpus = atoi(optarg);
> +            {
> +                char *p;
> +                char option[128];
> +                smp_cpus = strtol(optarg,&p, 10);
>                   if (smp_cpus<  1) {
>                       fprintf(stderr, "Invalid number of CPUs\n");
>                       exit(1);
>                   }
> +                if (*p++ != ',')
> +                    break;
>    

Won't this misparse "-smp 17z"?

> +                if (get_param_value(option, 128, "maxcpus", p))
> +                    max_cpus = strtol(option, NULL, 0);
> +                if (max_cpus<  smp_cpus) {
> +                    fprintf(stderr, "maxcpus must be equal to or greater than "
> +                            "smp\n");
> +                    exit(1);
> +                }
> +                if (max_cpus>  255) {
> +                    fprintf(stderr, "Unsupported number of maxcpus\n");
> +                    exit(1);
> +                }
>                   break;
> +            }
>    

We really need a table-driven parser for options.

-- 
error compiling committee.c: too many arguments to function