Documentation/infiniband: update from locked to pinned_vm

  I/O targets be kept resident at the same physical address.  The

  ib_uverbs module manages pinning and unpinning memory regions via

  get_user_pages() and put_page() calls.  It also accounts for the

  amount of memory pinned in the process's locked_vm, and checks that

  amount of memory pinned in the process's pinned_vm, and checks that

  unprivileged processes do not exceed their RLIMIT_MEMLOCK limit.

  Pages that are pinned multiple times are counted each time they are

  pinned, so the value of locked_vm may be an overestimate of the

  pinned, so the value of pinned_vm may be an overestimate of the

  number of pages pinned by a process.

/dev files