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    SubjectRe: [PATCH 06/16] IB uverbs: memory pinning implementation
    Roland Dreier <rolandd@cisco.com> wrote:
    >
    > Add support for pinning userspace memory regions and returning a list
    > of pages in the region. This includes tracking pinned memory against
    > vm_locked and preventing unprivileged users from exceeding RLIMIT_MEMLOCK.
    >

    Can you tell us a bit more about the design ideas here? What's it doing,
    how and why?

    We should look at these things and also decide whether some of this should
    live in mm/*.

    > +int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
    > + void *addr, size_t size, int write)
    > +{
    > ...
    > + if (!can_do_mlock())
    > + return -EPERM;
    > +
    > ...
    > + if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {

    The capable() test is redundant.
    -
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