Question about PRIVATE_FUTEX

[Minchan Kim]

Hi, Peter and Eric.

I am not expert about futex.
I am sorry if this is dumb question.

If we use private futex, get_futex_key don't call get_user_pages_fast
which pins page at page table.
Then, get_futex_value_locked calls __cpy_from_user_inatomic with
pagefault_disable.

Who make sure the user page is mapped at app's page table ?

-- 
Kinds regards,
Minchan Kim
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