1. 27 9月, 2013 4 次提交
    • U
      ARC: Use clockevents_config_and_register over clockevents_register_device · 55c2e262
      Uwe Kleine-König 提交于
      clockevents_config_and_register is more clever and correct than doing it
      by hand; so use it.
      
      [vgupta: fixed build failure due to missing ; in patch]
      Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      55c2e262
    • V
      ARC: Workaround spinlock livelock in SMP SystemC simulation · 6c00350b
      Vineet Gupta 提交于
      Some ARC SMP systems lack native atomic R-M-W (LLOCK/SCOND) insns and
      can only use atomic EX insn (reg with mem) to build higher level R-M-W
      primitives. This includes a SystemC based SMP simulation model.
      
      So rwlocks need to use a protecting spinlock for atomic cmp-n-exchange
      operation to update reader(s)/writer count.
      
      The spinlock operation itself looks as follows:
      
      	mov reg, 1		; 1=locked, 0=unlocked
      retry:
      	EX reg, [lock]		; load existing, store 1, atomically
      	BREQ reg, 1, rety	; if already locked, retry
      
      In single-threaded simulation, SystemC alternates between the 2 cores
      with "N" insn each based scheduling. Additionally for insn with global
      side effect, such as EX writing to shared mem, a core switch is
      enforced too.
      
      Given that, 2 cores doing a repeated EX on same location, Linux often
      got into a livelock e.g. when both cores were fiddling with tasklist
      lock (gdbserver / hackbench) for read/write respectively as the
      sequence diagram below shows:
      
                 core1                                   core2
               --------                                --------
      1. spin lock [EX r=0, w=1] - LOCKED
      2. rwlock(Read)            - LOCKED
      3. spin unlock  [ST 0]     - UNLOCKED
                                               spin lock [EX r=0,w=1] - LOCKED
                            -- resched core 1----
      
      5. spin lock [EX r=1] - ALREADY-LOCKED
      
                            -- resched core 2----
      6.                                       rwlock(Write) - READER-LOCKED
      7.                                       spin unlock [ST 0]
      8.                                       rwlock failed, retry again
      
      9.                                       spin lock  [EX r=0, w=1]
                            -- resched core 1----
      
      10  spinlock locked in #9, retry #5
      11. spin lock [EX gets 1]
                            -- resched core 2----
      ...
      ...
      
      The fix was to unlock using the EX insn too (step 7), to trigger another
      SystemC scheduling pass which would let core1 proceed, eliding the
      livelock.
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      6c00350b
    • V
      ARC: Fix 32-bit wrap around in access_ok() · 0752adfd
      Vineet Gupta 提交于
      Anton reported
      
       | LTP tests syscalls/process_vm_readv01 and process_vm_writev01 fail
       | similarly in one testcase test_iov_invalid -> lvec->iov_base.
       | Testcase expects errno EFAULT and return code -1,
       | but it gets return code 1 and ERRNO is 0 what means success.
      
      Essentially test case was passing a pointer of -1 which access_ok()
      was not catching. It was doing [@addr + @sz <= TASK_SIZE] which would
      pass for @addr == -1
      
      Fixed that by rewriting as [@addr <= TASK_SIZE - @sz]
      Reported-by: NAnton Kolesov <Anton.Kolesov@synopsys.com>
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      0752adfd
    • M
      ARC: Handle zero-overhead-loop in unaligned access handler · c11eb222
      Mischa Jonker 提交于
      If a load or store is the last instruction in a zero-overhead-loop, and
      it's misaligned, the loop would execute only once.
      
      This fixes that problem.
      Signed-off-by: NMischa Jonker <mjonker@synopsys.com>
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      c11eb222
  2. 24 9月, 2013 3 次提交
    • L
      Linux 3.12-rc2 · 4a10c2ac
      Linus Torvalds 提交于
      4a10c2ac
    • L
      Merge tag 'staging-3.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 9d23108d
      Linus Torvalds 提交于
      Pull staging fixes from Greg KH:
       "Here are a number of small staging tree and iio driver fixes.  Nothing
        major, just lots of little things"
      
      * tag 'staging-3.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (34 commits)
        iio:buffer_cb: Add missing iio_buffer_init()
        iio: Prevent race between IIO chardev opening and IIO device free
        iio: fix: Keep a reference to the IIO device for open file descriptors
        iio: Stop sampling when the device is removed
        iio: Fix crash when scan_bytes is computed with active_scan_mask == NULL
        iio: Fix mcp4725 dev-to-indio_dev conversion in suspend/resume
        iio: Fix bma180 dev-to-indio_dev conversion in suspend/resume
        iio: Fix tmp006 dev-to-indio_dev conversion in suspend/resume
        iio: iio_device_add_event_sysfs() bugfix
        staging: iio: ade7854-spi: Fix return value
        staging:iio:hmc5843: Fix measurement conversion
        iio: isl29018: Fix uninitialized value
        staging:iio:dummy fix kfifo_buf kconfig dependency issue if kfifo modular and buffer enabled for built in dummy driver.
        iio: at91: fix adc_clk overflow
        staging: line6: add bounds check in snd_toneport_source_put()
        Staging: comedi: Fix dependencies for drivers misclassified as PCI
        staging: r8188eu: Adjust RX gain
        staging: r8188eu: Fix smatch warning in core/rtw_ieee80211.
        staging: r8188eu: Fix smatch error in core/rtw_mlme_ext.c
        staging: r8188eu: Fix Smatch off-by-one warning in hal/rtl8188e_hal_init.c
        ...
      9d23108d
    • L
      Merge tag 'usb-3.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · e04a0a5a
      Linus Torvalds 提交于
      Pull USB fixes from Greg KH:
       "Here are a number of small USB fixes for 3.12-rc2.
      
        One is a revert of a EHCI change that isn't quite ready for 3.12.
        Others are minor things, gadget fixes, Kconfig fixes, and some quirks
        and documentation updates.
      
        All have been in linux-next for a bit"
      
      * tag 'usb-3.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
        USB: pl2303: distinguish between original and cloned HX chips
        USB: Faraday fotg210: fix email addresses
        USB: fix typo in usb serial simple driver Kconfig
        Revert "USB: EHCI: support running URB giveback in tasklet context"
        usb: s3c-hsotg: do not disconnect gadget when receiving ErlySusp intr
        usb: s3c-hsotg: fix unregistration function
        usb: gadget: f_mass_storage: reset endpoint driver data when disabled
        usb: host: fsl-mph-dr-of: Staticize local symbols
        usb: gadget: f_eem: Staticize eem_alloc
        usb: gadget: f_ecm: Staticize ecm_alloc
        usb: phy: omap-usb3: Fix return value
        usb: dwc3: gadget: avoid memory leak when failing to allocate all eps
        usb: dwc3: remove extcon dependency
        usb: gadget: add '__ref' for rndis_config_register() and cdc_config_register()
        usb: dwc3: pci: add support for BayTrail
        usb: gadget: cdc2: fix conversion to new interface of f_ecm
        usb: gadget: fix a bug and a WARN_ON in dummy-hcd
        usb: gadget: mv_u3d_core: fix violation of locking discipline in mv_u3d_ep_disable()
      e04a0a5a
  3. 23 9月, 2013 4 次提交
    • L
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · d8524ae9
      Linus Torvalds 提交于
      Pull drm fixes from Dave Airlie:
       - some small fixes for msm and exynos
       - a regression revert affecting nouveau users with old userspace
       - intel pageflip deadlock and gpu hang fixes, hsw modesetting hangs
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (22 commits)
        Revert "drm: mark context support as a legacy subsystem"
        drm/i915: Don't enable the cursor on a disable pipe
        drm/i915: do not update cursor in crtc mode set
        drm/exynos: fix return value check in lowlevel_buffer_allocate()
        drm/exynos: Fix address space warnings in exynos_drm_fbdev.c
        drm/exynos: Fix address space warning in exynos_drm_buf.c
        drm/exynos: Remove redundant OF dependency
        drm/msm: drop unnecessary set_need_resched()
        drm/i915: kill set_need_resched
        drm/msm: fix potential NULL pointer dereference
        drm/i915/dvo: set crtc timings again for panel fixed modes
        drm/i915/sdvo: Robustify the dtd<->drm_mode conversions
        drm/msm: workaround for missing irq
        drm/msm: return -EBUSY if bo still active
        drm/msm: fix return value check in ERR_PTR()
        drm/msm: fix cmdstream size check
        drm/msm: hangcheck harder
        drm/msm: handle read vs write fences
        drm/i915/sdvo: Fully translate sync flags in the dtd->mode conversion
        drm/i915: Use proper print format for debug prints
        ...
      d8524ae9
    • L
      Merge branch 'for-3.12/core' of git://git.kernel.dk/linux-block · 68cf8d0c
      Linus Torvalds 提交于
      Pull block IO fixes from Jens Axboe:
       "After merge window, no new stuff this time only a collection of neatly
        confined and simple fixes"
      
      * 'for-3.12/core' of git://git.kernel.dk/linux-block:
        cfq: explicitly use 64bit divide operation for 64bit arguments
        block: Add nr_bios to block_rq_remap tracepoint
        If the queue is dying then we only call the rq->end_io callout. This leaves bios setup on the request, because the caller assumes when the blk_execute_rq_nowait/blk_execute_rq call has completed that the rq->bios have been cleaned up.
        bio-integrity: Fix use of bs->bio_integrity_pool after free
        blkcg: relocate root_blkg setting and clearing
        block: Convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)
        block: trace all devices plug operation
      68cf8d0c
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 0fbf2cc9
      Linus Torvalds 提交于
      Pull btrfs fixes from Chris Mason:
       "These are mostly bug fixes and a two small performance fixes.  The
        most important of the bunch are Josef's fix for a snapshotting
        regression and Mark's update to fix compile problems on arm"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (25 commits)
        Btrfs: create the uuid tree on remount rw
        btrfs: change extent-same to copy entire argument struct
        Btrfs: dir_inode_operations should use btrfs_update_time also
        btrfs: Add btrfs: prefix to kernel log output
        btrfs: refuse to remount read-write after abort
        Btrfs: btrfs_ioctl_default_subvol: Revert back to toplevel subvolume when arg is 0
        Btrfs: don't leak transaction in btrfs_sync_file()
        Btrfs: add the missing mutex unlock in write_all_supers()
        Btrfs: iput inode on allocation failure
        Btrfs: remove space_info->reservation_progress
        Btrfs: kill delay_iput arg to the wait_ordered functions
        Btrfs: fix worst case calculator for space usage
        Revert "Btrfs: rework the overcommit logic to be based on the total size"
        Btrfs: improve replacing nocow extents
        Btrfs: drop dir i_size when adding new names on replay
        Btrfs: replay dir_index items before other items
        Btrfs: check roots last log commit when checking if an inode has been logged
        Btrfs: actually log directory we are fsync()'ing
        Btrfs: actually limit the size of delalloc range
        Btrfs: allocate the free space by the existed max extent size when ENOSPC
        ...
      0fbf2cc9
    • A
      cfq: explicitly use 64bit divide operation for 64bit arguments · f3cff25f
      Anatol Pomozov 提交于
      'samples' is 64bit operant, but do_div() second parameter is 32.
      do_div silently truncates high 32 bits and calculated result
      is invalid.
      
      In case if low 32bit of 'samples' are zeros then do_div() produces
      kernel crash.
      Signed-off-by: NAnatol Pomozov <anatol.pomozov@gmail.com>
      Acked-by: NTejun Heo <tj@kernel.org>
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      f3cff25f
  4. 22 9月, 2013 3 次提交
  5. 21 9月, 2013 26 次提交