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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
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#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
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_TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)