Re: [Qemu-devel] [PATCH 02/16] vl: set default ram_size during variable initialization

[Paolo Bonzini <pbonzini@redhat.com>]

Il 09/09/2013 16:06, Igor Mammedov ha scritto:
> On Fri, 02 Aug 2013 22:33:24 +0200
> Andreas Färber <afaerber@suse.de> wrote:
> 
>> Am 23.07.2013 18:22, schrieb Igor Mammedov:
>>> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
>>> ---
>>>  vl.c |    7 +------
>>>  1 files changed, 1 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/vl.c b/vl.c
>>> index 8190504..bf0c658 100644
>>> --- a/vl.c
>>> +++ b/vl.c
>>> @@ -2947,7 +2947,7 @@ int main(int argc, char **argv, char **envp)
>>>      module_call_init(MODULE_INIT_MACHINE);
>>>      machine = find_default_machine();
>>>      cpu_model = NULL;
>>> -    ram_size = 0;
>>> +    ram_size = DEFAULT_RAM_SIZE * 1024 * 1024;
>>>      snapshot = 0;
>>>      cyls = heads = secs = 0;
>>>      translation = BIOS_ATA_TRANSLATION_AUTO;
>>> @@ -4064,11 +4064,6 @@ int main(int argc, char **argv, char **envp)
>>>          exit(1);
>>>      }
>>>  
>>> -    /* init the memory */
>>> -    if (ram_size == 0) {
>>> -        ram_size = DEFAULT_RAM_SIZE * 1024 * 1024;
>>> -    }
>>> -
>>>      if (qemu_opts_foreach(qemu_find_opts("device"), device_help_func, NULL, 0)
>>>          != 0) {
>>>          exit(0);
>>
>> Commit message doesn't give any explanation why?
> it was intended as cleanup
> 
>>
>> What happens with -m 0? My guess is the old code translates that to the
>> default size, where by intializing the default earlier it would stay.
> patch is broken in this aspect. It aborts on start up with -m 0
> 
> The question is if -m 0 is correct value, perhaps QEMU should exit with
> error message in this case, instead of silent fallback to default?

I guess we have to keep it for backwards compatibility.

Paolo