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migration/postcopy: the valid condition is one less then end 

If one equals end, it means we have gone through the whole bitmap.

Use a more restrict check to skip a unnecessary condition.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190627020822.15485-2-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 10:08:20 +08:00 committed by Dr. David Alan Gilbert
parent 640dfb14db
commit 0abfff9ea7
1 changed files with 1 additions and 1 deletions
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2
migration/ram.c
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@ -2865,7 +2865,7 @@ static int postcopy_send_discard_bm_ram(MigrationState *ms,
for (current = 0; current < end; ) {
unsigned long one = find_next_bit(unsentmap, end, current);
if (one <= end) {
if (one < end) {
unsigned long zero = find_next_zero_bit(unsentmap, end, one + 1);
unsigned long discard_length;