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[Qemu-devel] [PATCH 3/3] migration/postcopy: discard_length must not be


From: Wei Yang
Subject: [Qemu-devel] [PATCH 3/3] migration/postcopy: discard_length must not be 0
Date: Thu, 27 Jun 2019 10:08:22 +0800

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 <address@hidden>
---
 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




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