1. 11 6月, 2013 2 次提交
  2. 09 6月, 2013 13 次提交
  3. 08 6月, 2013 14 次提交
    • L
      Merge tag 'trace-fixes-v3.10-rc3-v3' of... · 14d0ee05
      Linus Torvalds 提交于
      Merge tag 'trace-fixes-v3.10-rc3-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
      
      Pull tracing fixes from Steven Rostedt:
       "This contains 4 fixes.
      
        The first two fix the case where full RCU debugging is enabled,
        enabling function tracing causes a live lock of the system.  This is
        due to the added debug checks in rcu_dereference_raw() that is used by
        the function tracer.  These checks are also traced by the function
        tracer as well as cause enough overhead to the function tracer to slow
        down the system enough that the time to finish an interrupt can take
        longer than when the next interrupt is triggered, causing a live lock
        from the timer interrupt.
      
        Talking this over with Paul McKenney, we came up with a fix that adds
        a new rcu_dereference_raw_notrace() that does not perform these added
        checks, and let the function tracer use that.
      
        The third commit fixes a failed compile when branch tracing is
        enabled, due to the conversion of the trace_test_buffer() selftest
        that the branch trace wasn't converted for.
      
        The forth patch fixes a bug caught by the RCU lockdep code where a
        rcu_read_lock() is performed when rcu is disabled (either going to or
        from idle, or user space).  This happened on the irqsoff tracer as it
        calls task_uid().  The fix here was to use current_uid() when possible
        that doesn't use rcu locking.  Which luckily, is always used when
        irqsoff calls this code."
      
      * tag 'trace-fixes-v3.10-rc3-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        tracing: Use current_uid() for critical time tracing
        tracing: Fix bad parameter passed in branch selftest
        ftrace: Use the rcu _notrace variants for rcu_dereference_raw() and friends
        rcu: Add _notrace variation of rcu_dereference_raw() and hlist_for_each_entry_rcu()
      14d0ee05
    • R
      Revert "ACPI / scan: do not match drivers against objects having scan handlers" · ea7f6656
      Rafael J. Wysocki 提交于
      Commit 9f29ab11 ("ACPI / scan: do not match drivers against objects
      having scan handlers") introduced a boot regression on Tony's ia64 HP
      rx2600.  Tony says:
      
        "It panics with the message:
      
         Kernel panic - not syncing: Unable to find SBA IOMMU: Try a generic or DIG kernel
      
         [...] my problem comes from arch/ia64/hp/common/sba_iommu.c
         where the code in sba_init() says:
      
              acpi_bus_register_driver(&acpi_sba_ioc_driver);
              if (!ioc_list) {
      
         but because of this change we never managed to call ioc_init()
         so ioc_list doesn't get set up, and we die."
      
      Revert it to avoid this breakage and we'll fix the problem it attempted
      to address later.
      Reported-by: NTony Luck <tony.luck@gmail.com>
      Cc: 3.9+ <stable@vger.kernel.org>
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      ea7f6656
    • O
      Merge tag 'mxs-fixes-3.10' of git://git.linaro.org/people/shawnguo/linux-2.6 into fixes · 090878aa
      Olof Johansson 提交于
      From Shawn Guo, mxs fixes for 3.10:
      
      - Since the time we move to MULTI_IRQ_HANDLER, the 0x7f polling for no
        interrupt in icoll_handle_irq() becomes insane, because 0x7f is an
        valid interrupt number, the irq of gpio bank 0.  That unnecessary
        polling results in the driver not detecting when irq 0x7f is active
        which makes the machine effectively dead lock.  The fix removes the
        interrupt poll loop and allows usage of gpio0 interrupt without an
        infinite loop.
      
      * tag 'mxs-fixes-3.10' of git://git.linaro.org/people/shawnguo/linux-2.6:
        ARM: mxs: icoll: Fix interrupts gpio bank 0
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      090878aa
    • O
      Merge tag 'imx-fixes-3.10-2' of git://git.linaro.org/people/shawnguo/linux-2.6 into fixes · 3d0d8b91
      Olof Johansson 提交于
      From Shawn Guo, imx fixes for 3.10, take 2:
      
      - One device tree fix for all spi node to have per clock added.
        The clock is needed by spi driver to calculate bit rate divisor.
        The spi node in the current device trees either does not have the
        clock or is defined as dummy clock, in which case the driver probe
        will fail or spi will run at a wrong bit rate.
      
      - Two imx6q clock fixes, which correct axi_sels and ldb_di_sels.
      
      * tag 'imx-fixes-3.10-2' of git://git.linaro.org/people/shawnguo/linux-2.6:
        ARM: imx: clk-imx6q: AXI clock select index is incorrect
        ARM: dts: imx: fix clocks for cspi
        ARM i.MX6q: fix for ldb_di_sels
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      3d0d8b91
    • D
      ARM: exynos: add debug_ll_io_init() call in exynos_init_io() · 9c1fcdcc
      Doug Anderson 提交于
      If the early MMU mapping of the UART happens to get booted out of the
      TLB between the start of paging_init() and when we finally re-add the
      UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
      we've got early_printk enabled.  Avoid this hang by calling
      debug_ll_io_init() early.
      
      Without this patch, you can reliably reproduce a hang when early
      printk is enabled by adding flush_tlb_all() at the start of
      exynos_init_io().  After this patch the hang goes away.
      Signed-off-by: NDoug Anderson <dianders@chromium.org>
      Acked-by: NKukjin Kim <kgene.kim@samsung.com>
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      9c1fcdcc
    • O
      Merge tag 'renesas-fixes-for-v3.10' of... · fb565ff7
      Olof Johansson 提交于
      Merge tag 'renesas-fixes-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes
      
      From Simon Horman, Renesas ARM based SoC fixes for v3.10:
      - Correction to USB OVC and PENC pin groupings on r8a7779 SoC.
        This avoids conflicts when the USB_OVCn pins are used by another function.
        This has been observed to be a problem in v3.10-rc1.
      - Update CMT clock rating for sh73a0 SoC to resolve boot failure
        on kzm9g-reference. This resolves a regression between v3.9 and v3.10-rc1.
      
      * tag 'renesas-fixes-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
        ARM: shmobile: sh73a0: Update CMT clockevent rating to 80
        sh-pfc: r8a7779: Don't group USB OVC and PENC pins
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      fb565ff7
    • T
      ARM: EXYNOS: uncompress - print debug messages if DEBUG_LL is defined · 437d8ac5
      Tushar Behera 提交于
      Printing low-level debug messages make an assumption that the specified
      UART port has been preconfigured by the bootloader. Incorrectly
      specified UART port results in system getting stalled while printing the
      message "Uncompressing Linux... done, booting the kernel"
      This UART port number is specified through S3C_LOWLEVEL_UART_PORT. Since
      the UART port might different for different board, it is not possible to
      specify it correctly for every board that use a common defconfig file.
      
      Calling this print subroutine only when DEBUG_LL fixes the problem. By
      disabling DEBUG_LL in default config file, we would be able to boot
      multiple boards with different default UART ports.
      
      With this current approach, we miss the print "Uncompressing Linux...
      done, booting the kernel." when DEBUG_LL is not defined.
      Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      437d8ac5
    • L
      Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband · e8193ce5
      Linus Torvalds 提交于
      Pull infiniband fixes from Roland Dreier:
       - qib RCU/lockdep fix
       - iser device removal fix, plus doc fixes
      
      * tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
        IB/qib: Fix lockdep splat in qib_alloc_lkey()
        MAINTAINERS: Add entry for iSCSI Extensions for RDMA (iSER) initiator
        IB/iser: Add Mellanox copyright
        IB/iser: Fix device removal flow
      e8193ce5
    • L
      Merge tag 'vfio-v3.10-rc5' of git://github.com/awilliam/linux-vfio · 5125ed5b
      Linus Torvalds 提交于
      Pull vfio fix from Alex Williamson:
       "fix rmmod crash"
      
      * tag 'vfio-v3.10-rc5' of git://github.com/awilliam/linux-vfio:
        vfio: fix crash on rmmod
      5125ed5b
    • L
      Merge tag 'ecryptfs-3.10-rc5-msync' of... · b8e9dbac
      Linus Torvalds 提交于
      Merge tag 'ecryptfs-3.10-rc5-msync' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
      
      Pull ecryptfs fixes from Tyler Hicks:
       - Fixes how eCryptfs handles msync to sync both the upper and lower
         file
       - A couple of MAINTAINERS updates
      
      * tag 'ecryptfs-3.10-rc5-msync' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
        eCryptfs: Check return of filemap_write_and_wait during fsync
        Update eCryptFS maintainers
        ecryptfs: fixed msync to flush data
      b8e9dbac
    • L
      Merge branch 'for-3.10' of git://git.samba.org/sfrench/cifs-2.6 · e4327859
      Linus Torvalds 提交于
      Pull CIFS fix from Steve French:
       "Fix one byte buffer overrun with prefixpaths on cifs mounts which can
        cause a problem with mount depending on the string length"
      
      * 'for-3.10' of git://git.samba.org/sfrench/cifs-2.6:
        cifs: fix off-by-one bug in build_unc_path_to_root
      e4327859
    • A
      dmatest: do not allow to interrupt ongoing tests · bcc567e3
      Andy Shevchenko 提交于
      When user interrupts ongoing transfers the dmatest may end up with console
      lockup, oops, or data mismatch. This patch prevents user to abort any ongoing
      test.
      
      Documentation is updated accordingly.
      Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
      Reported-by: NWill Deacon <will.deacon@arm.com>
      Tested-by: NWill Deacon <will.deacon@arm.com>
      Signed-off-by: NVinod Koul <vinod.koul@intel.com>
      bcc567e3
    • L
      Merge tag 'sound-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · 308f8813
      Linus Torvalds 提交于
      Pull sound fixes from Takashi Iwai:
       - A pile of small regression fix patches for HD-audio VIA codecs
       - Quirks for HD-aduio and USB-audio devices
       - A trivial SIS7019 error path fix
      
      * tag 'sound-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: usb-audio - Fix invalid volume resolution on Logitech HD webcam c270
        ALSA: usb-audio - Apply Logitech QuickCam Pro 9000 quirk only to audio iface
        ALSA: hda/via - Clean up duplicated codes
        ALSA: hda/via - Fix wrongly cleared pins after suspend on VT1802
        ALSA: hda - Add keep_eapd_on flag to generic parser
        ALSA: hda - Allow setting automute/automic hooks after parsing
        ALSA: hda/via - Disable broken dynamic power control
        ALSA: usb-audio: fix Roland/Cakewalk UM-3G support
        ALSA: hda - Add headset quirk for two Dell machines
        ALSA: hda - add dock support for Thinkpad T431s
        ALSA: sis7019: fix error return code in sis_chip_create()
      308f8813
    • L
      Merge tag 'pm+acpi-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 3132aef2
      Linus Torvalds 提交于
      Pull power management and ACPI fixes from Rafael J Wysocki:
      
       - Fix for an ACPI PM regression causing Toshiba P870-303 to crash
         during boot from Rafael J Wysocki.
      
       - ACPI fix for an issue causing some drivers to attempt to bind to
         devices they shouldn't touch from Aaron Lu.
      
       - Fix for a recent cpufreq regression related to a possible race with
         CPU offline from Michael Wang.
      
       - ACPI cpufreq regression fix for an issue causing turbo frequencies to
         be underutilized in some cases from Ross Lagerwall.
      
       - cpufreq-cpu0 driver fix related to incorrect clock ACPI usage from
         Guennadi Liakhovetski.
      
       - HP WMI driver fix for an issue causing GPS initialization and
         poweroff failures on HP Elitebook 6930p from Lan Tianyu.
      
       - APEI (ACPI Platform Error Interface) fix for an issue in the error
         code path in ghes_probe() from Wei Yongjun.
      
       - New ACPI video driver blacklist entries for HP m4 and HP Pavilion g6
         from Alex Hung and Ash Willis.
      
      * tag 'pm+acpi-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization
        cpufreq: cpufreq-cpu0: use the exact frequency for clk_set_rate()
        cpufreq: protect 'policy->cpus' from offlining during __gov_queue_work()
        ACPI / scan: do not match drivers against objects having scan handlers
        ACPI / APEI: fix error return code in ghes_probe()
        acpi-cpufreq: set current frequency based on target P-State
        ACPI / video: ignore BIOS initial backlight value for HP Pavilion g6
        ACPI / video: ignore BIOS initial backlight value for HP m4
        x86 / platform / hp_wmi: Fix bluetooth_rfkill misuse in hp_wmi_rfkill_setup()
      3132aef2
  4. 07 6月, 2013 11 次提交
    • R
      Merge branch 'pm-fixes' · c6617b39
      Rafael J. Wysocki 提交于
      * pm-fixes:
        cpufreq: cpufreq-cpu0: use the exact frequency for clk_set_rate()
        cpufreq: protect 'policy->cpus' from offlining during __gov_queue_work()
        acpi-cpufreq: set current frequency based on target P-State
      c6617b39
    • R
      Merge branch 'acpi-fixes' · 2314b692
      Rafael J. Wysocki 提交于
      * acpi-fixes:
        ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization
        ACPI / scan: do not match drivers against objects having scan handlers
        ACPI / APEI: fix error return code in ghes_probe()
        ACPI / video: ignore BIOS initial backlight value for HP Pavilion g6
        ACPI / video: ignore BIOS initial backlight value for HP m4
        x86 / platform / hp_wmi: Fix bluetooth_rfkill misuse in hp_wmi_rfkill_setup()
      2314b692
    • R
      ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization · 7cd8407d
      Rafael J. Wysocki 提交于
      Commit b3785492 (ACPI / PM: Do not power manage devices in unknown
      initial states) added code to force devices without _PSC, but having
      _PS0 defined in the ACPI namespace, into ACPI power state D0 by
      executing _PS0 for them.  That turned out to break Toshiba P870-303,
      however, so revert that code.
      
      References: https://bugzilla.kernel.org/show_bug.cgi?id=58201Reported-and-tested-by: NJerome Cantenot <jerome.cantenot@gmail.com>
      Tracked-down-by: NLan Tianyu <tianyu.lan@intel.com>
      Cc: 3.9+ <stable@vger.kernel.org>
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      7cd8407d
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 1612e111
      Linus Torvalds 提交于
      Pull networking fix from David Miller:
       "This is a quick one commit pull request to cure the regression
        introduced by the MSG_CMSG_COMPAT change."
      
      (Background: commit 1be374a0 completely broke 32-bit COMPAT handling
      by not only disallowing MSG_CMSG_COMPAT from user APIs, but clearing it
      in our own internal use too!)
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
        net: Unbreak compat_sys_{send,recv}msg
      1612e111
    • L
      Merge tag 'staging-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · e2b02e25
      Linus Torvalds 提交于
      Pull staging driver fixes from Greg Kroah-Hartman:
       "Here are some staging and IIO driver fixes for the 3.10-rc5 release.
      
        All of them are tiny, and fix a number of reported issues (build and
        runtime)"
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      
      * tag 'staging-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        iio:inkern: Fix typo/bug in convert raw to processed.
        iio: frequency: ad4350: Fix bug / typo in mask
        inkern: iio_device_put after incorrect return/goto
        staging: alarm-dev: information leak in alarm_compat_ioctl()
        iio:callback buffer: free the scan_mask
        staging: alarm-dev: information leak in alarm_ioctl()
        drivers: staging: zcache: fix compile error
        staging: dwc2: fix value of dma_mask
      e2b02e25
    • L
      Merge tag 'tty-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty · 3b285cb2
      Linus Torvalds 提交于
      Pull tty/serial driver fixes from Greg Kroah-Hartman:
       "Here are some small bugfixes, and one revert, of serial driver issues
        that have been reported"
      
      * tag 'tty-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
        Revert "serial: 8250: Make SERIAL_8250_RUNTIME_UARTS work correctly"
        serial: samsung: enable clock before clearing pending interrupts during init
        serial/imx: disable hardware flow control at startup
      3b285cb2
    • L
      Merge tag 'usb-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · c6d6b9d1
      Linus Torvalds 提交于
      Pull USB fixes from Greg Kroah-Hartman:
       "Here are a number of USB bugfixes and new device ids for the 3.10-rc5
        tree.
      
        Nothing major here, a number of new device ids (and movement from the
        option to the zte_ev driver of a number of ids that we had previously
        gotten wrong, some xhci bugfixes, some usb-serial driver fixes that
        were recently found, some host controller fixes / reverts, and a
        variety of smaller other things"
      
      * tag 'usb-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (29 commits)
        USB: option,zte_ev: move most ZTE CDMA devices to zte_ev
        USB: option: blacklist network interface on Huawei E1820
        USB: whiteheat: fix broken port configuration
        USB: serial: fix TIOCMIWAIT return value
        USB: mos7720: fix hardware flow control
        USB: keyspan: remove unused endpoint-array access
        USB: keyspan: fix bogus array index
        USB: zte_ev: fix broken open
        USB: serial: Add Option GTM681W to qcserial device table.
        USB: Serial: cypress_M8: Enable FRWD Dongle hidcom device
        USB: EHCI: fix regression related to qh_refresh()
        usbfs: Increase arbitrary limit for USB 3 isopkt length
        USB: zte_ev: fix control-message timeouts
        USB: mos7720: fix message timeouts
        USB: iuu_phoenix: fix bulk-message timeout
        USB: ark3116: fix control-message timeout
        USB: mos7840: fix DMA to stack
        USB: mos7720: fix DMA to stack
        USB: visor: fix initialisation of Treo/Kyocera devices
        USB: serial: fix Treo/Kyocera interrrupt-in urb context
        ...
      c6d6b9d1
    • L
      Merge tag 'pci-v3.10-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci · c51aa6db
      Linus Torvalds 提交于
      Pull PCI fixes from Bjorn Helgaas:
       "This fixes a crash when booting a 32-bit kernel via the EFI boot stub.
      
        PCI ROM from EFI
            x86/PCI: Map PCI setup data with ioremap() so it can be in highmem"
      
      * tag 'pci-v3.10-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
        x86/PCI: Map PCI setup data with ioremap() so it can be in highmem
      c51aa6db
    • L
      Merge tag 'for-linus-v3.10-rc5' of git://oss.sgi.com/xfs/xfs · e6395b68
      Linus Torvalds 提交于
      Pull more xfs updates from Ben Myers:
       "Here are several fixes for filesystems with CRC support turned on:
        fixes for quota, remote attributes, and recovery.  There is also some
        feature work related to CRCs: the implementation of CRCs for the inode
        unlinked lists, disabling noattr2/attr2 options when appropriate, and
        bumping the maximum number of ACLs.
      
        I would have preferred to defer this last category of items to 3.11.
        This would require setting a feature bit for the on-disk changes, so
        there is some pressure to get these in 3.10.  I believe this
        represents the end of the CRC related queue.
      
         - Rework of dquot CRCs
         - Fix for remote attribute invalidation of a leaf
         - Fix ordering of transaction replay in recovery
         - Implement CRCs for inode unlinked list
         - Disable noattr2/attr2 mount options when CRCs are enabled
         - Bump the limitation of ACL entries for v5 superblocks"
      
      * tag 'for-linus-v3.10-rc5' of git://oss.sgi.com/xfs/xfs:
        xfs: increase number of ACL entries for V5 superblocks
        xfs: disable noattr2/attr2 mount options for CRC enabled filesystems
        xfs: inode unlinked list needs to recalculate the inode CRC
        xfs: fix log recovery transaction item reordering
        xfs: fix remote attribute invalidation for a leaf
        xfs: rework dquot CRCs
      e6395b68
    • A
      net: Unbreak compat_sys_{send,recv}msg · a7526eb5
      Andy Lutomirski 提交于
      I broke them in this commit:
      
          commit 1be374a0
          Author: Andy Lutomirski <luto@amacapital.net>
          Date:   Wed May 22 14:07:44 2013 -0700
      
              net: Block MSG_CMSG_COMPAT in send(m)msg and recv(m)msg
      
      This patch adds __sys_sendmsg and __sys_sendmsg as common helpers that accept
      MSG_CMSG_COMPAT and blocks MSG_CMSG_COMPAT at the syscall entrypoints.  It
      also reverts some unnecessary checks in sys_socketcall.
      
      Apparently I was suffering from underscore blindness the first time around.
      Signed-off-by: NAndy Lutomirski <luto@amacapital.net>
      Tested-by: NEric Dumazet <edumazet@google.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      a7526eb5
    • S
      tracing: Use current_uid() for critical time tracing · f17a5194
      Steven Rostedt (Red Hat) 提交于
      The irqsoff tracer records the max time that interrupts are disabled.
      There are hooks in the assembly code that calls back into the tracer when
      interrupts are disabled or enabled.
      
      When they are enabled, the tracer checks if the amount of time they
      were disabled is larger than the previous recorded max interrupts off
      time. If it is, it creates a snapshot of the currently running trace
      to store where the last largest interrupts off time was held and how
      it happened.
      
      During testing, this RCU lockdep dump appeared:
      
      [ 1257.829021] ===============================
      [ 1257.829021] [ INFO: suspicious RCU usage. ]
      [ 1257.829021] 3.10.0-rc1-test+ #171 Tainted: G        W
      [ 1257.829021] -------------------------------
      [ 1257.829021] /home/rostedt/work/git/linux-trace.git/include/linux/rcupdate.h:780 rcu_read_lock() used illegally while idle!
      [ 1257.829021]
      [ 1257.829021] other info that might help us debug this:
      [ 1257.829021]
      [ 1257.829021]
      [ 1257.829021] RCU used illegally from idle CPU!
      [ 1257.829021] rcu_scheduler_active = 1, debug_locks = 0
      [ 1257.829021] RCU used illegally from extended quiescent state!
      [ 1257.829021] 2 locks held by trace-cmd/4831:
      [ 1257.829021]  #0:  (max_trace_lock){......}, at: [<ffffffff810e2b77>] stop_critical_timing+0x1a3/0x209
      [ 1257.829021]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff810dae5a>] __update_max_tr+0x88/0x1ee
      [ 1257.829021]
      [ 1257.829021] stack backtrace:
      [ 1257.829021] CPU: 3 PID: 4831 Comm: trace-cmd Tainted: G        W    3.10.0-rc1-test+ #171
      [ 1257.829021] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS SDBLI944.86P 05/08/2007
      [ 1257.829021]  0000000000000001 ffff880065f49da8 ffffffff8153dd2b ffff880065f49dd8
      [ 1257.829021]  ffffffff81092a00 ffff88006bd78680 ffff88007add7500 0000000000000003
      [ 1257.829021]  ffff88006bd78680 ffff880065f49e18 ffffffff810daebf ffffffff810dae5a
      [ 1257.829021] Call Trace:
      [ 1257.829021]  [<ffffffff8153dd2b>] dump_stack+0x19/0x1b
      [ 1257.829021]  [<ffffffff81092a00>] lockdep_rcu_suspicious+0x109/0x112
      [ 1257.829021]  [<ffffffff810daebf>] __update_max_tr+0xed/0x1ee
      [ 1257.829021]  [<ffffffff810dae5a>] ? __update_max_tr+0x88/0x1ee
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810dbf85>] update_max_tr_single+0x11d/0x12d
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810e2b15>] stop_critical_timing+0x141/0x209
      [ 1257.829021]  [<ffffffff8109569a>] ? trace_hardirqs_on+0xd/0xf
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810e3057>] time_hardirqs_on+0x2a/0x2f
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff8109550c>] trace_hardirqs_on_caller+0x16/0x197
      [ 1257.829021]  [<ffffffff8109569a>] trace_hardirqs_on+0xd/0xf
      [ 1257.829021]  [<ffffffff811002b9>] user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810029b4>] do_notify_resume+0x92/0x97
      [ 1257.829021]  [<ffffffff8154bdca>] int_signal+0x12/0x17
      
      What happened was entering into the user code, the interrupts were enabled
      and a max interrupts off was recorded. The trace buffer was saved along with
      various information about the task: comm, pid, uid, priority, etc.
      
      The uid is recorded with task_uid(tsk). But this is a macro that uses rcu_read_lock()
      to retrieve the data, and this happened to happen where RCU is blind (user_enter).
      
      As only the preempt and irqs off tracers can have this happen, and they both
      only have the tsk == current, if tsk == current, use current_uid() instead of
      task_uid(), as current_uid() does not use RCU as only current can change its uid.
      
      This fixes the RCU suspicious splat.
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      f17a5194