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

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* 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.

> 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