Merge Linux 4.4.257 kernel

Changes in 4.4.257: (39 commits)
        net_sched: reject silly cell_log in qdisc_get_rtab()
        futex,rt_mutex: Provide futex specific rt_mutex API
        futex: Remove rt_mutex_deadlock_account_*()
        futex: Rework inconsistent rt_mutex/futex_q state
        futex: Avoid violating the 10th rule of futex
        futex: Replace pointless printk in fixup_owner()
        futex: Provide and use pi_state_update_owner()
        rtmutex: Remove unused argument from rt_mutex_proxy_unlock()
        futex: Use pi_state_update_owner() in put_pi_state()
        futex: Simplify fixup_pi_state_owner()
        futex: Handle faults correctly for PI futexes
        usb: udc: core: Use lock when write to soft_connect
        scsi: libfc: Avoid invoking response handler twice if ep is already completed
        scsi: ibmvfc: Set default timeout to avoid crash during migration
        stable: clamp SUBLEVEL in 4.4 and 4.9
        USB: serial: cp210x: add pid/vid for WSDA-200-USB
        USB: serial: cp210x: add new VID/PID for supporting Teraoka AD2000
        USB: serial: option: Adding support for Cinterion MV31
        Input: i8042 - unbreak Pegatron C15B
        net: lapb: Copy the skb before sending a packet
        ELF/MIPS build fix
        elfcore: fix building with clang
        USB: gadget: legacy: fix an error code in eth_bind()
        USB: usblp: don't call usb_set_interface if there's a single alt
        usb: dwc2: Fix endpoint direction check in ep_from_windex
        mac80211: fix station rate table updates on assoc
        kretprobe: Avoid re-registration of the same kretprobe earlier
        cifs: report error instead of invalid when revalidating a dentry fails
        mmc: core: Limit retries when analyse of SDIO tuples fails
        ARM: footbridge: fix dc21285 PCI configuration accessors
        mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page
        mm: hugetlb: fix a race between isolating and freeing page
        mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active
        x86/build: Disable CET instrumentation in the kernel
        x86/apic: Add extra serialization for non-serializing MSRs
        Input: xpad - sync supported devices with fork on GitHub
        ACPI: thermal: Do not call acpi_thermal_check() directly
        ALSA: hda/realtek - Fix typo of pincfg for Dell quirk
        Linux 4.4.257