Re: [Qemu-devel] [PATCH] migration: equation is more proper than and to check LOADVM_QUIT

[Wei Yang <richard.weiyang@gmail.com>]

On Fri, Jul 19, 2019 at 07:41:28PM +0100, Dr. David Alan Gilbert wrote:
>* Wei Yang (richardw.yang@linux.intel.com) wrote:
>> LOADVM_QUIT allows a command to quit all layers of nested loadvm loops,
>> while current return value check is not that proper even it works now.
>> 
>> Current return value check "ret & LOADVM_QUIT" would return true if
>> bit[0] is 1. This would be true when ret is -1 which is used to indicate
>> an error of handling a command.
>> 
>> Since there is only one place return LOADVM_QUIT and no other
>> combination of return value, use "ret == LOADVM_QUIT" would be more
>> proper.
>
>Yes, when I first wrote this it was more complex with a few flags, and
>they all got removed.
>

Ah, life is much easier now :-)

>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>
>Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
>
>> ---
>>  migration/savevm.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/migration/savevm.c b/migration/savevm.c
>> index 1a9b1f411e..25fe7ea05a 100644
>> --- a/migration/savevm.c
>> +++ b/migration/savevm.c
>> @@ -2429,7 +2429,7 @@ retry:
>>          case QEMU_VM_COMMAND:
>>              ret = loadvm_process_command(f);
>>              trace_qemu_loadvm_state_section_command(ret);
>> -            if ((ret < 0) || (ret & LOADVM_QUIT)) {
>> +            if ((ret < 0) || (ret == LOADVM_QUIT)) {
>>                  goto out;
>>              }
>>              break;
>> -- 
>> 2.17.1
>> 
>--
>Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

-- 
Wei Yang
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