Saucy update to 3.11.6 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from Linus' tree or in a minimally
       backported form of that patch. The 3.11.6 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches are in the 3.11.6 stable release:
             Linux 3.11.6
             x86: avoid remapping data in parse_setup_data()
             ipc/sem.c: update sem_otime for all operations
             ipc/sem.c: synchronize the proc interface
             ipc/sem.c: optimize sem_lock()
             ipc: drop ipc_lock_check
             ipc, shm: drop shm_lock_check
             ipc: drop ipc_lock_by_ptr
             ipc, shm: guard against non-existant vma in shmdt(2)
             ipc: document general ipc locking scheme
             ipc,msg: drop msg_unlock
             ipc: rename ids->rw_mutex
             ipc,shm: shorten critical region for shmat
             ipc,shm: cleanup do_shmat pasta
             ipc,shm: shorten critical region for shmctl
             ipc,shm: make shmctl_nolock lockless
             ipc,shm: introduce shmctl_nolock
             ipc: drop ipcctl_pre_down
             ipc,shm: shorten critical region in shmctl_down
             ipc,shm: introduce lockless functions to obtain the ipc object
             drm/radeon: fix hw contexts for SUMO2 asics
             drm/radeon: fix typo in CP DMA register headers
             drm/radeon: forever loop on error in radeon_do_test_moves()
             drm/radeon/dpm: off by one in si_set_mc_special_registers()
             drm/i915: fix rps.vlv_work initialization
             drm/i915: Only apply DPMS to the encoder if enabled
             drm/i915/hsw: Disable L3 caching of atomic memory operations.
             ALSA: hda - Fix mono speakers and headset mic on Dell Vostro 5470
             compiler/gcc4: Add quirk for 'asm goto' miscompilation bug
             drm/radeon/dpm/btc: off by one in btc_set_mc_special_registers()
             MIPS: stack protector: Fix per-task canary switch
             watchdog: kempld_wdt: Fix bit mask definition
             watchdog: ts72xx_wdt: locking bug in ioctl
             ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"
             ARC: Fix signal frame management for SA_SIGINFO
             ARC: Workaround spinlock livelock in SMP SystemC simulation
             ARC: Fix 32-bit wrap around in access_ok()
             ARC: Handle zero-overhead-loop in unaligned access handler
             ARC: Fix __udelay calculation
             parisc: fix interruption handler to respect pagefault_disable()
             KVM: PPC: Book3S HV: Fix typo in saving DSCR
             ext4: fix memory leak in xattr
             Btrfs: use right root when checking for hash collision
             hwmon: (applesmc) Always read until end of data
             i2c: omap: Clear ARDY bit twice
             vfs: allow O_PATH file descriptors for fstatfs()
             random: run random_int_secret_init() run after all late_initcalls
             ALSA: hda - Fix microphone for Sony VAIO Pro 13 (Haswell model)
             ALSA: hda - Add fixup for ASUS N56VZ
             ALSA: hda - hdmi: Fix channel map switch not taking effect
             ALSA: snd-usb-usx2y: remove bogus frame checks