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    SubjectRe: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
    > Is EFAULT really optional on systems with page protection?

    It's de facto -- e.g. the x86-64 vsyscalls (getimeofday, time, clock_gettime,
    getcpu) never implement it.

    -- -- Speaking for myself only.

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