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Re-apply r336984, reverting r339934.

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r336984 exposed the bug fixed in r340241, leading to the initial revert
while the bug was being hunted down.  Now that the bug is fixed, we
can revert the revert.

Discussed with:	alc
MFC after:	3 days
This commit is contained in:
Mark Johnston 2018-11-10 20:33:08 +00:00
parent 900c4ed3ca
commit 0e48e06807
1 changed files with 3 additions and 2 deletions
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5
sys/vm/vm_object.c
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@ -2143,8 +2143,9 @@ vm_object_coalesce(vm_object_t prev_object, vm_ooffset_t prev_offset,
next_size >>= PAGE_SHIFT;
next_pindex = OFF_TO_IDX(prev_offset) + prev_size;
if ((prev_object->ref_count > 1) &&
(prev_object->size != next_pindex)) {
if (prev_object->ref_count > 1 &&
prev_object->size != next_pindex &&
(prev_object->flags & OBJ_ONEMAPPING) == 0) {
VM_OBJECT_WUNLOCK(prev_object);
return (FALSE);
}