Merge Linux 4.4.266 kernel

Changes in 4.4.266: (22 commits)
        net: pxa168_eth: Fix a potential data race in pxa168_eth_remove
        mISDN: fix crash in fritzpci
        mac80211: choose first enabled channel for monitor
        x86/build: Turn off -fcf-protection for realmode targets
        ia64: mca: allocate early mca with GFP_ATOMIC
        cifs: revalidate mapping when we open files for SMB1 POSIX
        cifs: Silently ignore unknown oplock break handle
        bpf, x86: Validate computation of branch displacements for x86-64
        ALSA: hda/realtek - Fix pincfg for Dell XPS 13 9370
        mtd: rawnand: tmio: Fix the probe error path
        mtd: rawnand: socrates: Fix the probe error path
        mtd: rawnand: sharpsl: Fix the probe error path
        mtd: rawnand: plat_nand: Fix the probe error path
        mtd: rawnand: pasemi: Fix the probe error path
        mtd: rawnand: orion: Fix the probe error path
        mtd: rawnand: diskonchip: Fix the probe error path
        tracing: Add a vmalloc_sync_mappings() for safe measure
        init/Kconfig: make COMPILE_TEST depend on !UML
        init/Kconfig: make COMPILE_TEST depend on !S390
        init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM
        can: flexcan: flexcan_chip_freeze(): fix chip freeze for missing bitrate
        Linux 4.4.266