Since we break the loop when there is no more page to discard, we are
sure the following process would find some page to discard.

It is not necessary to check it again.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---
 migration/ram.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index b41b58ee54..246efe6939 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2789,9 +2789,7 @@ static int postcopy_send_discard_bm_ram(MigrationState *ms,
         } else {
             discard_length = zero - one;
         }
-        if (discard_length) {
-            postcopy_discard_send_range(ms, pds, one, discard_length);
-        }
+        postcopy_discard_send_range(ms, pds, one, discard_length);
         current = one + discard_length;
     }
 
-- 
2.19.1

* Wei Yang (richardw.yang@linux.intel.com) wrote:
> Since we break the loop when there is no more page to discard, we are
> sure the following process would find some page to discard.
> 
> It is not necessary to check it again.
> 
> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  migration/ram.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/migration/ram.c b/migration/ram.c
> index b41b58ee54..246efe6939 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -2789,9 +2789,7 @@ static int postcopy_send_discard_bm_ram(MigrationState *ms,
>          } else {
>              discard_length = zero - one;
>          }
> -        if (discard_length) {
> -            postcopy_discard_send_range(ms, pds, one, discard_length);
> -        }
> +        postcopy_discard_send_range(ms, pds, one, discard_length);
>          current = one + discard_length;
>      }
>  
> -- 
> 2.19.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK