drm/amdkfd: handle VMA remove race
VMA may be removed before unmap notifier callback, and deferred list work remove range, return success for this special case as we are handling stale retry fault. Signed-off-by: NPhilip Yang <Philip.Yang@amd.com> Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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