Re: [Qemu-devel] [PATCH] vl.c: Output error on invalid machine type provided

[Michal Novotny <minovotn@redhat.com>]

On 07/30/2013 04:46 PM, Peter Maydell wrote:
> On 30 July 2013 15:28, Michal Novotny <minovotn@redhat.com> wrote:
>> Output error message when user provides the invalid machine type
>> on the command line. This also saves time to find what issue is
>> when you upgrade from one version of qemu to another version that
>> doesn't support required machine type any longer.
>>
>> Michal
>>
>> Signed-off-by: Michal Novotny <minovotn@redhat.com>
>> ---
>>  vl.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/vl.c b/vl.c
>> index 25b8f2f..4455b26 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -2671,6 +2671,10 @@ static QEMUMachine *machine_parse(const char *name)
>>      if (machine) {
>>          return machine;
>>      }
>> +
>> +    if (*name != '0')
>> +        printf("Error: Unsupported machine type '%s'\n", name);
>> +
> Hi; thanks for the patch. I think the idea is a good
> one but there are some minor issues with the implementation:
>
> This now causes "-M help" to print a spurious line
> "Error: Unsupported machine type 'help'".
>
> You need braces around if statements, even one-liners.
> (scripts/checkpatch.pl may help with this kind of thing.)
>
> This function can be called with name being NULL but
> you try to dereference it.
>
> My suggestion is that your condition should be
>     if (name && !is_help_option(name)) {
>         ...
>     }

Hi Peter,
thanks a lot for your reply. I rewrote the patch and checked it using
scripts/checkpatch.pl. It's already sent as v2 to the list.

Thanks a lot for your feedback,
Michal

-- 
Michal Novotny <minovotn@redhat.com>, RHCE, Red Hat
Virtualization | libvirt-php bindings | php-virt-control.org