sys_wait4(): put_user() with current->state!=TASK_RUNNING

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Andrea,
you fixed the last race in sys_wait4() and you often tweak the
scheduler, perhaps you can help me:

sys_wait4() calls put_user() with current->state == TASK_INTERRUPTIBLE.
other functions call get_user() with this current->state.
If put_user() must page-in the target page, then it would return with
current->state == TASK_RUNNING, correct?

But: is it guaranteed that the function will return? In the worst case,
there is no wait-queue that would force a wake-up.

Thanks,
        Manfred

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