1. 23 Sep, 2012 3 commits
    • Paul E. McKenney's avatar
      rcu: Track CPU-hotplug duration statistics · 13dbf914
      Paul E. McKenney authored
      Many rcutorture runs include CPU-hotplug operations in their stress
      testing.  This commit accumulates statistics on the durations of these
      operations in deference to the recent concern about the overhead and
      latency of these operations.
      Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
      13dbf914
    • Paul E. McKenney's avatar
      rcu: Update rcutorture defaults · ab840f7a
      Paul E. McKenney authored
      A number of new features have been added to rcutorture over the years, but
      the defaults have not been updated to include them.  This commit therefore
      turns on a couple of them that have proven helpful and trustworthy, namely
      periodic progress reports and testing of NO_HZ.
      Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
      ab840f7a
    • Paul E. McKenney's avatar
      rcu: Fix day-one dyntick-idle stall-warning bug · a10d206e
      Paul E. McKenney authored
      Each grace period is supposed to have at least one callback waiting
      for that grace period to complete.  However, if CONFIG_NO_HZ=n, an
      extra callback-free grace period is no big problem -- it will chew up
      a tiny bit of CPU time, but it will complete normally.  In contrast,
      CONFIG_NO_HZ=y kernels have the potential for all the CPUs to go to
      sleep indefinitely, in turn indefinitely delaying completion of the
      callback-free grace period.  Given that nothing is waiting on this grace
      period, this is also not a problem.
      
      That is, unless RCU CPU stall warnings are also enabled, as they are
      in recent kernels.  In this case, if a CPU wakes up after at least one
      minute of inactivity, an RCU CPU stall warning will result.  The reason
      that no one noticed until quite recently is that most systems have enough
      OS noise that they will never remain absolutely idle for a full minute.
      But there are some embedded systems with cut-down userspace configurations
      that consistently get into this situation.
      
      All this begs the question of exactly how a callback-free grace period
      gets started in the first place.  This can happen due to the fact that
      CPUs do not necessarily agree on which grace period is in progress.
      If a CPU still believes that the grace period that just completed is
      still ongoing, it will believe that it has callbacks that need to wait for
      another grace period, never mind the fact that the grace period that they
      were waiting for just completed.  This CPU can therefore erroneously
      decide to start a new grace period.  Note that this can happen in
      TREE_RCU and TREE_PREEMPT_RCU even on a single-CPU system:  Deadlock
      considerations mean that the CPU that detected the end of the grace
      period is not necessarily officially informed of this fact for some time.
      
      Once this CPU notices that the earlier grace period completed, it will
      invoke its callbacks.  It then won't have any callbacks left.  If no
      other CPU has any callbacks, we now have a callback-free grace period.
      
      This commit therefore makes CPUs check more carefully before starting a
      new grace period.  This new check relies on an array of tail pointers
      into each CPU's list of callbacks.  If the CPU is up to date on which
      grace periods have completed, it checks to see if any callbacks follow
      the RCU_DONE_TAIL segment, otherwise it checks to see if any callbacks
      follow the RCU_WAIT_TAIL segment.  The reason that this works is that
      the RCU_WAIT_TAIL segment will be promoted to the RCU_DONE_TAIL segment
      as soon as the CPU is officially notified that the old grace period
      has ended.
      
      This change is to cpu_needs_another_gp(), which is called in a number
      of places.  The only one that really matters is in rcu_start_gp(), where
      the root rcu_node structure's ->lock is held, which prevents any
      other CPU from starting or completing a grace period, so that the
      comparison that determines whether the CPU is missing the completion
      of a grace period is stable.
      Reported-by: default avatarBecky Bruce <bgillbruce@gmail.com>
      Reported-by: default avatarSubodh Nijsure <snijsure@grid-net.com>
      Reported-by: default avatarPaul Walmsley <paul@pwsan.com>
      Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Tested-by: Paul Walmsley <paul@pwsan.com>  # OMAP3730, OMAP4430
      Cc: stable@vger.kernel.org
      a10d206e
  2. 12 Sep, 2012 1 commit
  3. 08 Sep, 2012 3 commits
    • Linus Torvalds's avatar
      Linux 3.6-rc5 · 55d512e2
      Linus Torvalds authored
      55d512e2
    • Linus Torvalds's avatar
      Merge branch 'fixes-for-3.6' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping · 32d687ca
      Linus Torvalds authored
      Pull DMA-mapping fixes from Marek Szyprowski:
       "Another set of fixes for ARM dma-mapping subsystem.
      
        Commit e9da6e99 replaced custom consistent buffer remapping code
        with generic vmalloc areas.  It however introduced some regressions
        caused by limited support for allocations in atomic context.  This
        series contains fixes for those regressions.
      
        For some subplatforms the default, pre-allocated pool for atomic
        allocations turned out to be too small, so a function for setting its
        size has been added.
      
        Another set of patches adds support for atomic allocations to
        IOMMU-aware DMA-mapping implementation.
      
        The last part of this pull request contains two fixes for Contiguous
        Memory Allocator, which relax too strict requirements."
      
      * 'fixes-for-3.6' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
        ARM: dma-mapping: IOMMU allocates pages from atomic_pool with GFP_ATOMIC
        ARM: dma-mapping: Introduce __atomic_get_pages() for __iommu_get_pages()
        ARM: dma-mapping: Refactor out to introduce __in_atomic_pool
        ARM: dma-mapping: atomic_pool with struct page **pages
        ARM: Kirkwood: increase atomic coherent pool size
        ARM: DMA-Mapping: print warning when atomic coherent allocation fails
        ARM: DMA-Mapping: add function for setting coherent pool size from platform code
        ARM: relax conditions required for enabling Contiguous Memory Allocator
        mm: cma: fix alignment requirements for contiguous regions
      32d687ca
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 11be4bc6
      Linus Torvalds authored
      Pull input subsystem updates from Dmitry Torokhov.
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: wacom - add support for EMR on Cintiq 24HD touch
        Input: i8042 - add Gigabyte T1005 series netbooks to noloop table
        Input: imx_keypad - reset the hardware before enabling
        Input: edt-ft5x06 - fix build error when compiling wthout CONFIG_DEBUG_FS
      11be4bc6
  4. 07 Sep, 2012 4 commits
  5. 06 Sep, 2012 14 commits
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · eeea3ac9
      Linus Torvalds authored
      Pull ARM SoC bug fixes from Olof Johansson:
       "Mostly Renesas and Atmel bugfixes this time, targeting boot and build
        problems.  A couple of patches for gemini and kirkwood as well.  On a
        whole nothing very controversial."
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        ARM: gemini: fix the gemini build
        ARM: shmobile: armadillo800eva: enable rw rootfs mount
        ARM: Kirkwood: Fix 'SZ_1M' undeclared here for db88f6281-bp-setup.c
        ARM: shmobile: mackerel: fixup usb module order
        ARM: shmobile: armadillo800eva: fixup: sound card detection order
        ARM: shmobile: marzen: fixup smsc911x id for regulator
        ARM: at91/feature-removal-schedule: delay at91_mci removal
        ARM: mach-shmobile: armadillo800eva: Enable power button as wakeup source
        ARM: mach-shmobile: armadillo800eva: Fix GPIO buttons descriptions
        ARM: at91/dts: remove partial parameter in at91sam9g25ek.dts
        ARM: at91/clock: fix PLLA overclock warning
        ARM: at91: fix rtc-at91sam9 irq issue due to sparse irq support
        ARM: at91: fix system timer irq issue due to sparse irq support
        ARM: shmobile: sh73a0: fixup RELOC_BASE of intca_irq_pins_desc
      eeea3ac9
    • Linus Torvalds's avatar
      Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging · c7c6bf1e
      Linus Torvalds authored
      Pull a hwmon fix from Guenter Roeck:
       "One patch, fixing DIV_ROUND_CLOSEST to support negative dividends.
      
        While the changes are not in the drivers/hwmon directory, the problem
        primarily affects hwmon drivers, and it makes sense to push the patch
        through the hwmon tree."
      
      * tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
        linux/kernel.h: Fix DIV_ROUND_CLOSEST to support negative dividends
      c7c6bf1e
    • Linus Torvalds's avatar
      Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild · bd12ce8c
      Linus Torvalds authored
      Pull kbuild fixes from Michal Marek:
       "These are two fixes that should go into 3.6.  The link-vmlinux.sh one
        is obvious.
      
        The other one fixes make firmware_install with certain configurations,
        where a file in the toplevel firmware tree gets installed first, and
        $(INSTALL_FW_PATH)/$$(dir <file>) results in /lib/firmware/./, which
        confuses make 3.82 for some reason."
      
      * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
        firmware: fix directory creation rule matching with make 3.82
        link-vmlinux.sh: Fix stray "echo" in error message
      bd12ce8c
    • Dave Jones's avatar
      Remove user-triggerable BUG from mpol_to_str · 80de7c31
      Dave Jones authored
      Trivially triggerable, found by trinity:
      
        kernel BUG at mm/mempolicy.c:2546!
        Process trinity-child2 (pid: 23988, threadinfo ffff88010197e000, task ffff88007821a670)
        Call Trace:
          show_numa_map+0xd5/0x450
          show_pid_numa_map+0x13/0x20
          traverse+0xf2/0x230
          seq_read+0x34b/0x3e0
          vfs_read+0xac/0x180
          sys_pread64+0xa2/0xc0
          system_call_fastpath+0x1a/0x1f
        RIP: mpol_to_str+0x156/0x360
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarDave Jones <davej@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      80de7c31
    • Konrad Rzeszutek Wilk's avatar
      xen/pciback: Fix proper FLR steps. · 80ba77df
      Konrad Rzeszutek Wilk authored
      When we do FLR and save PCI config we did it in the wrong order.
      The end result was that if a PCI device was unbind from
      its driver, then binded to xen-pciback, and then back to its
      driver we would get:
      
      > lspci -s 04:00.0
      04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
      13:42:12 # 4 :~/
      > echo "0000:04:00.0" > /sys/bus/pci/drivers/pciback/unbind
      > modprobe e1000e
      e1000e: Intel(R) PRO/1000 Network Driver - 2.0.0-k
      e1000e: Copyright(c) 1999 - 2012 Intel Corporation.
      e1000e 0000:04:00.0: Disabling ASPM L0s L1
      e1000e 0000:04:00.0: enabling device (0000 -> 0002)
      xen: registering gsi 48 triggering 0 polarity 1
      Already setup the GSI :48
      e1000e 0000:04:00.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
      e1000e: probe of 0000:04:00.0 failed with error -2
      
      This fixes it by first saving the PCI configuration space, then
      doing the FLR.
      Reported-by: default avatarRen, Yongjie <yongjie.ren@intel.com>
      Reported-and-Tested-by: default avatarTobias Geiger <tobias.geiger@vido.info>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      CC: stable@vger.kernel.org
      80ba77df
    • Linus Torvalds's avatar
      Merge tag 'mmc-fixes-for-3.6-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc · 08090950
      Linus Torvalds authored
      Pull MMC fixes from Chris Ball:
       - a firmware bug on several Samsung MoviNAND eMMC models causes
         permanent corruption on the device when secure erase and secure trim
         requests are made, so we disable those requests on these eMMC devices.
       - atmel-mci: fix a hang with some SD cards by waiting for not-busy flag.
       - dw_mmc: low-power mode breaks SDIO interrupts; fix PIO error handling;
         fix handling of error interrupts.
       - mxs-mmc: fix deadlocks; fix compile error due to dma.h arch change.
       - omap: fix broken PIO mode causing memory corruption.
       - sdhci-esdhc: fix card detection.
      
      * tag 'mmc-fixes-for-3.6-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc:
        mmc: omap: fix broken PIO mode
        mmc: card: Skip secure erase on MoviNAND; causes unrecoverable corruption.
        mmc: dw_mmc: Disable low power mode if SDIO interrupts are used
        mmc: dw_mmc: fix error handling in PIO mode
        mmc: dw_mmc: correct mishandling error interrupt
        mmc: dw_mmc: amend using error interrupt status
        mmc: atmel-mci: not busy flag has also to be used for read operations
        mmc: sdhci-esdhc: break out early if clock is 0
        mmc: mxs-mmc: fix deadlock caused by recursion loop
        mmc: mxs-mmc: fix deadlock in SDIO IRQ case
        mmc: bfin_sdh: fix dma_desc_array build error
      08090950
    • Miklos Szeredi's avatar
      uml: fix compile error in deliver_alarm() · bc6c8364
      Miklos Szeredi authored
      Fix the following compile error on UML.
      
        arch/um/os-Linux/time.c: In function 'deliver_alarm':
        arch/um/os-Linux/time.c:117:3: error: too few arguments to function 'alarm_handler'
        arch/um/os-Linux/internal.h:1:6: note: declared here
      
      The error was introduced by commit d3c1cfcd ("um: pass siginfo to guest
      process") in 3.6-rc1.
      Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
      CC: Martin Pärtel <martin.partel@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bc6c8364
    • Alan Cox's avatar
      dj: memory scribble in logi_dj · 8a55ade7
      Alan Cox authored
      Allocate a structure not a pointer to it !
      Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8a55ade7
    • Linus Torvalds's avatar
      Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc · cb4f9a29
      Linus Torvalds authored
      Pull powerpc fixes from Benjamin Herrenschmidt:
       "Here are a few fixes for 3.6 that were piling up while I was away or
        busy (I was mostly MIA a week or two before San Diego).
      
        Some fixes from Anton fixing up issues with our relatively new DSCR
        control feature, and a few other fixes that are either regressions or
        bugs nasty enough to warrant not waiting."
      
      * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
        powerpc: Don't use __put_user() in patch_instruction
        powerpc: Make sure IPI handlers see data written by IPI senders
        powerpc: Restore correct DSCR in context switch
        powerpc: Fix DSCR inheritance in copy_thread()
        powerpc: Keep thread.dscr and thread.dscr_inherit in sync
        powerpc: Update DSCR on all CPUs when writing sysfs dscr_default
        powerpc/powernv: Always go into nap mode when CPU is offline
        powerpc: Give hypervisor decrementer interrupts their own handler
        powerpc/vphn: Fix arch_update_cpu_topology() return value
      cb4f9a29
    • Linus Torvalds's avatar
      Merge tag 'gpio-fixes-for-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · 813e6438
      Linus Torvalds authored
      Pull GPIO fixes from Linus Walleij:
       "These are some GPIO regression fixes for v3.6:
         - Erroneous debug message from of_get_named_gpio_flags()
         - Make sure the MC9S08DZ60 GPIO driver depend on I2C being compiled
           in (not module) or allmodconfig breaks.
         - Check return value from irq_alloc_descs() in the Emma Mobile GPIO
           driver.
         - Assign the owner field for the rdc321x driver so the module won't
           be removed if it has active GPIOs."
      
      * tag 'gpio-fixes-for-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
        gpio: rdc321x: Prevent removal of modules exporting active GPIOs
        gpio: em: Fix checking return value of irq_alloc_descs
        gpio: mc9s08dz60: Fix build error if I2C=m
        gpio: Fix debug message in of_get_named_gpio_flags()
      813e6438
    • Linus Torvalds's avatar
      Merge tag 'sound-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · 5e682c0e
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "There are nothing scaring, contains only small fixes for HD-audio and
        USB-audio:
         - EPSS regression fix and GPIO fix for HD-audio IDT codecs
         - A series of USB-audio regression fixes that are found since 3.5
           kernel"
      
      * tag 'sound-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: snd-usb: fix cross-interface streaming devices
        ALSA: snd-usb: fix calls to next_packet_size
        ALSA: snd-usb: restore delay information
        ALSA: snd-usb: use list_for_each_safe for endpoint resources
        ALSA: snd-usb: Fix URB cancellation at stream start
        ALSA: hda - Don't trust codec EPSS bit for IDT 92HD83xx & co
        ALSA: hda - Avoid unnecessary parameter read for EPSS
        ALSA: hda - Do not set GPIOs for speakers on IDT if there are no speakers
      5e682c0e
    • Linus Torvalds's avatar
      Merge tag 'fbdev-fixes-for-3.6-1' of git://github.com/schandinat/linux-2.6 · 6d1a0503
      Linus Torvalds authored
      Pull fbdev fixes from Florian Tobias Schandinat:
       - a fix by Paul Cercueil to prevent a possible buffer overflow
       - a fix by Bruno Prémont to prevent a rare sleep in invalid context
       - a fix by Julia Lawall for a double free in auo_k190x
       - a fix by Dan Carpenter to prevent a division by zero in mb862xxfb
       - a regression fix by Tomi Valkeinen for the SDI output in OMAP
       - a fix by Grazvydas Ignotas to fix the console colors in OMAP
      
      * tag 'fbdev-fixes-for-3.6-1' of git://github.com/schandinat/linux-2.6:
        OMAPFB: fix framebuffer console colors
        OMAPDSS: Fix SDI PLL locking
        video: mb862xxfb: prevent divide by zero bug
        drivers/video/auo_k190x.c: drop kfree of devm_kzalloc's data
        fbcon: Fix bit_putcs() call to kmalloc(s, GFP_KERNEL)
        fbcon: prevent possible buffer overflow.
      6d1a0503
    • Linus Torvalds's avatar
      Merge tag 'upstream-3.6-rc5' of git://git.infradead.org/linux-ubi · 50234c58
      Linus Torvalds authored
      Pull ubi fix from Artem Bityutskiy:
       "A single small fix for memory deallocation: we allocated memory using
        'kmem_cache_alloc()' but were freeing it using 'kfree()' in some
        cases.  Now we fix this by using 'kmem_cache_free()' instead."
      
      * tag 'upstream-3.6-rc5' of git://git.infradead.org/linux-ubi:
        UBI: fix a horrible memory deallocation bug
      50234c58
    • Mikulas Patocka's avatar
      Fix order of arguments to compat_put_time[spec|val] · ed6fe9d6
      Mikulas Patocka authored
      Commit 644595f8 ("compat: Handle COMPAT_USE_64BIT_TIME in
      net/socket.c") introduced a bug where the helper functions to take
      either a 64-bit or compat time[spec|val] got the arguments in the wrong
      order, passing the kernel stack pointer off as a user pointer (and vice
      versa).
      
      Because of the user address range check, that in turn then causes an
      EFAULT due to the user pointer range checking failing for the kernel
      address.  Incorrectly resuling in a failed system call for 32-bit
      processes with a 64-bit kernel.
      
      On odder architectures like HP-PA (with separate user/kernel address
      spaces), it can be used read kernel memory.
      Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ed6fe9d6
  6. 05 Sep, 2012 15 commits