Merge 4.4.155 into kernel.lnx.4.4.r27-rel

Changes in 4.4.155: (48 commits)
        net: 6lowpan: fix reserved space for single frames
        net: mac802154: tx: expand tailroom if necessary
        9p/net: Fix zero-copy path in the 9p virtio transport
        net: lan78xx: Fix misplaced tasklet_schedule() call
        spi: davinci: fix a NULL pointer dereference
        drm/i915/userptr: reject zero user_size
        powerpc/fadump: handle crash memory ranges array index overflow
        powerpc/pseries: Fix endianness while restoring of r3 in MCE handler.
        fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed
        9p/virtio: fix off-by-one error in sg list bounds check
        net/9p/client.c: version pointer uninitialized
        net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()
        x86/mm/pat: Fix L1TF stable backport for CPA, 2nd call
        dm cache metadata: save in-core policy_hint_size to on-disk superblock
        iio: ad9523: Fix displayed phase
        iio: ad9523: Fix return value for ad952x_store()
        vmw_balloon: fix inflation of 64-bit GFNs
        vmw_balloon: do not use 2MB without batching
        vmw_balloon: VMCI_DOORBELL_SET does not check status
        vmw_balloon: fix VMCI use when balloon built into kernel
        tracing: Do not call start/stop() functions when tracing_on does not change
        tracing/blktrace: Fix to allow setting same value
        kthread, tracing: Don't expose half-written comm when creating kthreads
        uprobes: Use synchronize_rcu() not synchronize_sched()
        9p: fix multiple NULL-pointer-dereferences
        PM / sleep: wakeup: Fix build error caused by missing SRCU support
        pnfs/blocklayout: off by one in bl_map_stripe()
        ARM: tegra: Fix Tegra30 Cardhu PCA954x reset
        mm/tlb: Remove tlb_remove_table() non-concurrent condition
        iommu/vt-d: Add definitions for PFSID
        iommu/vt-d: Fix dev iotlb pfsid use
        osf_getdomainname(): use copy_to_user()
        sys: don't hold uts_sem while accessing userspace memory
        userns: move user access out of the mutex
        ubifs: Fix memory leak in lprobs self-check
        Revert "UBIFS: Fix potential integer overflow in allocation"
        ubifs: Check data node size before truncate
        ubifs: Fix synced_i_size calculation for xattr inodes
        pwm: tiehrpwm: Fix disabling of output of PWMs
        fb: fix lost console when the user unplugs a USB adapter
        udlfb: set optimal write delay
        getxattr: use correct xattr length
        bcache: release dc->writeback_lock properly in bch_writeback_thread()
        perf auxtrace: Fix queue resize
        fs/quota: Fix spectre gadget in do_quotactl
        x86/io: add interface to reserve io memtype for a resource range. (v1.1)
        drm/drivers: add support for using the arch wc mapping API.
        Linux 4.4.155

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>