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UFFDIO_WAKE was 0x4010_aa02 (_IOW) but should be 0x8010_aa02, causing every wake call to silently fail with -EINVAL. UFFD_FEATURE_MISSING_HUGETLBFS was (1<<6) but should be (1<<4), colliding with UFFD_FEATURE_EVENT_UNMAP. Signed-off-by: Zhiheng Tao <junchuan.tzh@antgroup.com>