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migration/postcopy: discard_length must not be 0

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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>
Message-Id: <20190627020822.15485-4-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Wei Yang 2019-06-27 10:08:22 +08:00 committed by Dr. David Alan Gilbert
parent 33a5cb6202
commit a162b572e9
1 changed files with 1 additions and 3 deletions
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4
migration/ram.c
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@ -2877,9 +2877,7 @@ 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;
}