1. 12 11月, 2014 1 次提交
  2. 09 11月, 2014 1 次提交
  3. 06 11月, 2014 1 次提交
  4. 05 11月, 2014 2 次提交
    • T
      ALSA: usb-audio: Fix device_del() sysfs warnings at disconnect · 0725dda2
      Takashi Iwai 提交于
      Some USB-audio devices show weird sysfs warnings at disconnecting the
      devices, e.g.
       usb 1-3: USB disconnect, device number 3
       ------------[ cut here ]------------
       WARNING: CPU: 0 PID: 973 at fs/sysfs/group.c:216 device_del+0x39/0x180()
       sysfs group ffffffff8183df40 not found for kobject 'midiC1D0'
       Call Trace:
        [<ffffffff814a3e38>] ? dump_stack+0x49/0x71
        [<ffffffff8103cb72>] ? warn_slowpath_common+0x82/0xb0
        [<ffffffff8103cc55>] ? warn_slowpath_fmt+0x45/0x50
        [<ffffffff813521e9>] ? device_del+0x39/0x180
        [<ffffffff81352339>] ? device_unregister+0x9/0x20
        [<ffffffff81352384>] ? device_destroy+0x34/0x40
        [<ffffffffa00ba29f>] ? snd_unregister_device+0x7f/0xd0 [snd]
        [<ffffffffa025124e>] ? snd_rawmidi_dev_disconnect+0xce/0x100 [snd_rawmidi]
        [<ffffffffa00c0192>] ? snd_device_disconnect+0x62/0x90 [snd]
        [<ffffffffa00c025c>] ? snd_device_disconnect_all+0x3c/0x60 [snd]
        [<ffffffffa00bb574>] ? snd_card_disconnect+0x124/0x1a0 [snd]
        [<ffffffffa02e54e8>] ? usb_audio_disconnect+0x88/0x1c0 [snd_usb_audio]
        [<ffffffffa015260e>] ? usb_unbind_interface+0x5e/0x1b0 [usbcore]
        [<ffffffff813553e9>] ? __device_release_driver+0x79/0xf0
        [<ffffffff81355485>] ? device_release_driver+0x25/0x40
        [<ffffffff81354e11>] ? bus_remove_device+0xf1/0x130
        [<ffffffff813522b9>] ? device_del+0x109/0x180
        [<ffffffffa01501d5>] ? usb_disable_device+0x95/0x1f0 [usbcore]
        [<ffffffffa014634f>] ? usb_disconnect+0x8f/0x190 [usbcore]
        [<ffffffffa0149179>] ? hub_thread+0x539/0x13a0 [usbcore]
        [<ffffffff810669f5>] ? sched_clock_local+0x15/0x80
        [<ffffffff81066c98>] ? sched_clock_cpu+0xb8/0xd0
        [<ffffffff81070730>] ? bit_waitqueue+0xb0/0xb0
        [<ffffffffa0148c40>] ? usb_port_resume+0x430/0x430 [usbcore]
        [<ffffffffa0148c40>] ? usb_port_resume+0x430/0x430 [usbcore]
        [<ffffffff8105973e>] ? kthread+0xce/0xf0
        [<ffffffff81059670>] ? kthread_create_on_node+0x1c0/0x1c0
        [<ffffffff814a8b7c>] ? ret_from_fork+0x7c/0xb0
        [<ffffffff81059670>] ? kthread_create_on_node+0x1c0/0x1c0
       ---[ end trace 40b1928d1136b91e ]---
      
      This comes from the fact that usb-audio driver may receive the
      disconnect callback multiple times, per each usb interface.  When a
      device has both audio and midi interfaces, it gets called twice, and
      currently the driver tries to release resources at the last call.
      At this point, the first parent interface has been already deleted,
      thus deleting a child of the first parent hits such a warning.
      
      For fixing this problem, we need to call snd_card_disconnect() and
      cancel pending operations at the very first disconnect while the
      release of the whole objects waits until the last disconnect call.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=80931Reported-and-tested-by: NTomas Gayoso <tgayoso@gmail.com>
      Reported-and-tested-by: NChris J Arges <chris.j.arges@canonical.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: NTakashi Iwai <tiwai@suse.de>
      0725dda2
    • H
      ALSA: hda - fix mute led problem for three HP laptops · c922c4e8
      Hui Wang 提交于
      Without the fix, the mute led can't work on these three machines.
      
      After apply this fix, these three machines will fall back on the led
      control quirk as below, and through testing, the mute led works very
      well.
      PIN_QUIRK(0x10ec0282, 0x103c, "HP", ALC269_FIXUP_HP_LINE1_MIC1_LED,
                  ALC282_STANDARD_PINS,
                  {0x12, 0x90a60140},
                  ...
      
      BugLink: https://bugs.launchpad.net/bugs/1389497Tested-by: NTieFu Chen <tienfu.chen@canonical.com>
      Cc: Kailang Yang <kailang@realtek.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: NHui Wang <hui.wang@canonical.com>
      Signed-off-by: NTakashi Iwai <tiwai@suse.de>
      c922c4e8
  5. 30 10月, 2014 4 次提交
  6. 29 10月, 2014 1 次提交
  7. 28 10月, 2014 1 次提交
  8. 27 10月, 2014 9 次提交
  9. 26 10月, 2014 1 次提交
  10. 25 10月, 2014 18 次提交
    • F
      ARM: dts: imx28-evk: Let i2c0 run at 100kHz · d1e61eb4
      Fabio Estevam 提交于
      Commit 78b81f46 ("ARM: dts: imx28-evk: Run I2C0 at 400kHz") caused issues
      when doing the following sequence in loop:
      
      - Boot the kernel
      - Perform audio playback
      - Reboot the system via 'reboot' command
      
      In many times the audio card cannot be probed, which causes playback to fail.
      
      After restoring to the original i2c0 frequency of 100kHz there is no such
      problem anymore.
      
      This reverts commit 78b81f46.
      
      Cc: <stable@vger.kernel.org> # 3.16+
      Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
      Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
      d1e61eb4
    • S
      ARM: i.MX6: Fix "emi" clock name typo · a1fc1980
      Steve Longerbeam 提交于
      Fix a typo error, the "emi" names refer to the eim clocks.
      
      The change fixes typo in EIM and EIM_SLOW pre-output dividers and
      selectors clock names. Notably EIM_SLOW clock itself is named correctly.
      Signed-off-by: NSteve Longerbeam <steve_longerbeam@mentor.com>
      [vladimir_zapolskiy@mentor.com: ported to v3.17]
      Signed-off-by: NVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
      Cc: Sascha Hauer <kernel@pengutronix.de>
      Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
      a1fc1980
    • A
      overlayfs: embed middle into overlay_readdir_data · db6ec212
      Al Viro 提交于
      same story...
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      db6ec212
    • A
      overlayfs: embed root into overlay_readdir_data · 49be4fb9
      Al Viro 提交于
      no sense having it a pointer - all instances have it pointing to
      local variable in the same stack frame
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      49be4fb9
    • A
      68bf8611
    • A
      overlayfs: don't hold ->i_mutex over opening the real directory · 3d268c9b
      Al Viro 提交于
      just use it to serialize the assignment
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      3d268c9b
    • L
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 2cc91884
      Linus Torvalds 提交于
      Pull MIPS fixes from Ralf Baechle:
       "This is the first round of fixes and tying up loose ends for MIPS.
      
         - plenty of fixes for build errors in specific obscure configurations
         - remove redundant code on the Lantiq platform
         - removal of a useless SEAD I2C driver that was causing a build issue
         - fix an earlier TLB exeption handler fix to also work on Octeon.
         - fix ISA level dependencies in FPU emulator's instruction decoding.
         - don't hardcode kernel command line in Octeon software emulator.
         - fix an earlier fix for the Loondson 2 clock setting"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: SEAD3: Fix I2C device registration.
        MIPS: SEAD3: Nuke PIC32 I2C driver.
        MIPS: ftrace: Fix a microMIPS build problem
        MIPS: MSP71xx: Fix build error
        MIPS: Malta: Do not build the malta-amon.c file if CMP is not enabled
        MIPS: Prevent compiler warning from cop2_{save,restore}
        MIPS: Kconfig: Add missing MIPS_CPS dependencies to PM and cpuidle
        MIPS: idle: Remove leftover __pastwait symbol and its references
        MIPS: Sibyte: Include the swarm subdir to the sb1250 LittleSur builds
        MIPS: ptrace.h: Add a missing include
        MIPS: ath79: Fix compilation error when CONFIG_PCI is disabled
        MIPS: MSP71xx: Remove compilation error when CONFIG_MIPS_MT is present
        MIPS: Octeon: Remove special case for simulator command line.
        MIPS: tlbex: Properly fix HUGE TLB Refill exception handler
        MIPS: loongson2_cpufreq: Fix CPU clock rate setting mismerge
        pci: pci-lantiq: remove duplicate check on resource
        MIPS: Lasat: Add missing CONFIG_PROC_FS dependency to PICVUE_PROC
        MIPS: cp1emu: Fix ISA restrictions for cop1x_op instructions
      2cc91884
    • L
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · cdc63a05
      Linus Torvalds 提交于
      Pull arm64 fixes from Catalin Marinas:
      
       - enable 48-bit VA space now that KVM has been fixed, together with a
         couple of fixes for pgd allocation alignment and initial memblock
         current_limit.  There is still a dependency on !ARM_SMMU which needs
         to be updated as it uses the page table manipulation macros of the
         host kernel
       - eBPF fixes following changes/conflicts during the merging window
       - Compat types affecting compat_elf_prpsinfo
       - Compilation error on UP builds
       - ASLR fix when /proc/sys/kernel/randomize_va_space == 0
       - DT definitions for CLCD support on ARMv8 model platform
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: Fix memblock current_limit with 64K pages and 48-bit VA
        arm64: ASLR: Don't randomise text when randomise_va_space == 0
        arm64: vexpress: Add CLCD support to the ARMv8 model platform
        arm64: Fix compilation error on UP builds
        Documentation/arm64/memory.txt: fix typo
        net: bpf: arm64: minor fix of type in jited
        arm64: bpf: add 'load 64-bit immediate' instruction
        arm64: bpf: add 'shift by register' instructions
        net: bpf: arm64: address randomize and write protect JIT code
        arm64: mm: Correct fixmap pagetable types
        arm64: compat: fix compat types affecting struct compat_elf_prpsinfo
        arm64: Align less than PAGE_SIZE pgds naturally
        arm64: Allow 48-bits VA space without ARM_SMMU
      cdc63a05
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc · 83da00fb
      Linus Torvalds 提交于
      Pull two sparc fixes from David Miller:
      
       1) Fix boots with gcc-4.9 compiled sparc64 kernels.
      
       2) Add missing __get_user_pages_fast() on sparc64 to fix hangs on
          futexes used in transparent hugepage areas.
      
          It's really idiotic to have a weak symbolled fallback that just
          returns zero, and causes this kind of bug.  There should be no
          backup implementation and the link should fail if the architecture
          fails to provide __get_user_pages_fast() and supports transparent
          hugepages.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
        sparc64: Implement __get_user_pages_fast().
        sparc64: Fix register corruption in top-most kernel stack frame during boot.
      83da00fb
    • L
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 96971e9a
      Linus Torvalds 提交于
      Pull kvm fixes from Paolo Bonzini:
       "This is a pretty large update.  I think it is roughly as big as what I
        usually had for the _whole_ rc period.
      
        There are a few bad bugs where the guest can OOPS or crash the host.
        We have also started looking at attack models for nested
        virtualization; bugs that usually result in the guest ring 0 crashing
        itself become more worrisome if you have nested virtualization,
        because the nested guest might bring down the non-nested guest as
        well.  For current uses of nested virtualization these do not really
        have a security impact, but you never know and bugs are bugs
        nevertheless.
      
        A lot of these bugs are in 3.17 too, resulting in a large number of
        stable@ Ccs.  I checked that all the patches apply there with no
        conflicts"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        kvm: vfio: fix unregister kvm_device_ops of vfio
        KVM: x86: Wrong assertion on paging_tmpl.h
        kvm: fix excessive pages un-pinning in kvm_iommu_map error path.
        KVM: x86: PREFETCH and HINT_NOP should have SrcMem flag
        KVM: x86: Emulator does not decode clflush well
        KVM: emulate: avoid accessing NULL ctxt->memopp
        KVM: x86: Decoding guest instructions which cross page boundary may fail
        kvm: x86: don't kill guest on unknown exit reason
        kvm: vmx: handle invvpid vm exit gracefully
        KVM: x86: Handle errors when RIP is set during far jumps
        KVM: x86: Emulator fixes for eip canonical checks on near branches
        KVM: x86: Fix wrong masking on relative jump/call
        KVM: x86: Improve thread safety in pit
        KVM: x86: Prevent host from panicking on shared MSR writes.
        KVM: x86: Check non-canonical addresses upon WRMSR
      96971e9a
    • L
      Merge tag 'stable/for-linus-3.18-b-rc1-tag' of... · 20ca57cd
      Linus Torvalds 提交于
      Merge tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
      
      Pull xen bug fixes from David Vrabel:
      
       - Fix regression in xen_clocksource_read() which caused all Xen guests
         to crash early in boot.
       - Several fixes for super rare race conditions in the p2m.
       - Assorted other minor fixes.
      
      * tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
        xen/pci: Allocate memory for physdev_pci_device_add's optarr
        x86/xen: panic on bad Xen-provided memory map
        x86/xen: Fix incorrect per_cpu accessor in xen_clocksource_read()
        x86/xen: avoid race in p2m handling
        x86/xen: delay construction of mfn_list_list
        x86/xen: avoid writing to freed memory after race in p2m handling
        xen/balloon: Don't continue ballooning when BP_ECANCELED is encountered
      20ca57cd
    • L
      Merge tag 'sound-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · c6d13403
      Linus Torvalds 提交于
      Pull sound fixes from Takashi Iwai:
       "Here are a chunk of small fixes since rc1: two PCM core fixes, one is
        a long-standing annoyance about lockdep and another is an ARM64 mmap
        fix.
      
        The rest are a HD-audio HDMI hotplug notification fix, a fix for
        missing NULL termination in Realtek codec quirks and a few new
        device/codec-specific quirks as usual"
      
      * tag 'sound-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: hda - Add missing terminating entry to SND_HDA_PIN_QUIRK macro
        ALSA: pcm: Fix false lockdep warnings
        ALSA: hda - Fix inverted LED gpio setup for Lenovo Ideapad
        ALSA: hda - hdmi: Fix missing ELD change event on plug/unplug
        ALSA: usb-audio: Add support for Steinberg UR22 USB interface
        ALSA: ALC283 codec - Avoid pop noise on headphones during suspend/resume
        ALSA: pcm: use the same dma mmap codepath both for arm and arm64
      c6d13403
    • L
      Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random · 14d4cc08
      Linus Torvalds 提交于
      Pull /dev/random updates from Ted Ts'o:
       "This adds a memzero_explicit() call which is guaranteed not to be
        optimized away by GCC.  This is important when we are wiping
        cryptographically sensitive material"
      
      * tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
        crypto: memzero_explicit - make sure to clear out sensitive data
        random: add and use memzero_explicit() for clearing data
      14d4cc08
    • L
      Merge tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 1c45d9a9
      Linus Torvalds 提交于
      Pull ACPI and power management updates from Rafael Wysocki:
       "This is material that didn't make it to my 3.18-rc1 pull request for
        various reasons, mostly related to timing and travel (LinuxCon EU /
        LPC) plus a couple of fixes for recent bugs.
      
        The only really new thing here is the PM QoS class for memory
        bandwidth, but it is simple enough and users of it will be added in
        the next cycle.  One major change in behavior is that platform devices
        enumerated by ACPI will use 32-bit DMA mask by default.  Also included
        is an ACPICA update to a new upstream release, but that's mostly
        cleanups, changes in tools and similar.  The rest is fixes and
        cleanups mostly.
      
        Specifics:
      
         - Fix for a recent PCI power management change that overlooked the
           fact that some IRQ chips might not be able to configure PCIe PME
           for system wakeup from Lucas Stach.
      
         - Fix for a bug introduced in 3.17 where acpi_device_wakeup() is
           called with a wrong ordering of arguments from Zhang Rui.
      
         - A bunch of intel_pstate driver fixes (all -stable candidates) from
           Dirk Brandewie, Gabriele Mazzotta and Pali Rohár.
      
         - Fixes for a rather long-standing problem with the OOM killer and
           the freezer that frozen processes killed by the OOM do not actually
           release any memory until they are thawed, so OOM-killing them is
           rather pointless, with a couple of cleanups on top (Michal Hocko,
           Cong Wang, Rafael J Wysocki).
      
         - ACPICA update to upstream release 20140926, inlcuding mostly
           cleanups reducing differences between the upstream ACPICA and the
           kernel code, tools changes (acpidump, acpiexec) and support for the
           _DDN object (Bob Moore, Lv Zheng).
      
         - New PM QoS class for memory bandwidth from Tomeu Vizoso.
      
         - Default 32-bit DMA mask for platform devices enumerated by ACPI
           (this change is mostly needed for some drivers development in
           progress targeted at 3.19) from Heikki Krogerus.
      
         - ACPI EC driver cleanups, mostly related to debugging, from Lv
           Zheng.
      
         - cpufreq-dt driver updates from Thomas Petazzoni.
      
         - powernv cpuidle driver update from Preeti U Murthy"
      
      * tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (34 commits)
        intel_pstate: Correct BYT VID values.
        intel_pstate: Fix BYT frequency reporting
        intel_pstate: Don't lose sysfs settings during cpu offline
        cpufreq: intel_pstate: Reflect current no_turbo state correctly
        cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers
        cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy
        PCI / PM: handle failure to enable wakeup on PCIe PME
        ACPI: invoke acpi_device_wakeup() with correct parameters
        PM / freezer: Clean up code after recent fixes
        PM: convert do_each_thread to for_each_process_thread
        OOM, PM: OOM killed task shouldn't escape PM suspend
        freezer: remove obsolete comments in __thaw_task()
        freezer: Do not freeze tasks killed by OOM killer
        ACPI / platform: provide default DMA mask
        cpuidle: powernv: Populate cpuidle state details by querying the device-tree
        cpufreq: cpufreq-dt: adjust message related to regulators
        cpufreq: cpufreq-dt: extend with platform_data
        cpufreq: allow driver-specific data
        ACPI / EC: Cleanup coding style.
        ACPI / EC: Refine event/query debugging messages.
        ...
      1c45d9a9
    • L
      Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux · 8264fce6
      Linus Torvalds 提交于
      Pull thermal management updates from Zhang Rui:
       "Sorry that I missed the merge window as there is a bug found in the
        last minute, and I have to fix it and wait for the code to be tested
        in linux-next tree for a few days.  Now the buggy patch has been
        dropped entirely from my next branch.  Thus I hope those changes can
        still be merged in 3.18-rc2 as most of them are platform thermal
        driver changes.
      
        Specifics:
      
         - introduce ACPI INT340X thermal drivers.
      
           Newer laptops and tablets may have thermal sensors and other
           devices with thermal control capabilities that are exposed for the
           OS to use via the ACPI INT340x device objects.  Several drivers are
           introduced to expose the temperature information and cooling
           ability from these objects to user-space via the normal thermal
           framework.
      
           From: Lu Aaron, Lan Tianyu, Jacob Pan and Zhang Rui.
      
         - introduce a new thermal governor, which just uses a hysteresis to
           switch abruptly on/off a cooling device.  This governor can be used
           to control certain fan devices that can not be throttled but just
           switched on or off.  From: Peter Feuerer.
      
         - introduce support for some new thermal interrupt functions on
           i.MX6SX, in IMX thermal driver.  From: Anson, Huang.
      
         - introduce tracing support on thermal framework.  From: Punit
           Agrawal.
      
         - small fixes in OF thermal and thermal step_wise governor"
      
      * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (25 commits)
        Thermal: int340x thermal: select ACPI fan driver
        Thermal: int3400_thermal: use acpi_thermal_rel parsing APIs
        Thermal: int340x_thermal: expose acpi thermal relationship tables
        Thermal: introduce int3403 thermal driver
        Thermal: introduce INT3402 thermal driver
        Thermal: move the KELVIN_TO_MILLICELSIUS macro to thermal.h
        ACPI / Fan: support INT3404 thermal device
        ACPI / Fan: add ACPI 4.0 style fan support
        ACPI / fan: convert to platform driver
        ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant
        ACPI / fan: remove no need check for device pointer
        ACPI / fan: remove unused macro
        Thermal: int3400 thermal: register to thermal framework
        Thermal: int3400 thermal: add capability to detect supporting UUIDs
        Thermal: introduce int3400 thermal driver
        ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package()
        ACPI: make acpi_create_platform_device() an external API
        thermal: step_wise: fix: Prevent from binary overflow when trend is dropping
        ACPI: introduce ACPI int340x thermal scan handler
        thermal: Added Bang-bang thermal governor
        ...
      8264fce6
    • C
      arm64: Fix memblock current_limit with 64K pages and 48-bit VA · 3dec0fe4
      Catalin Marinas 提交于
      With 48-bit VA space, the 64K page configuration uses 3 levels instead
      of 2 and PUD_SIZE != PMD_SIZE. Since with 64K pages we only cover
      PMD_SIZE with the initial swapper_pg_dir populated in head.S, the
      memblock current_limit needs to be set accordingly in map_mem() to avoid
      allocating unmapped memory. The memblock current_limit is progressively
      increased as more blocks are mapped.
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      3dec0fe4
    • D
      sparc64: Implement __get_user_pages_fast(). · 06090e8e
      David S. Miller 提交于
      It is not sufficient to only implement get_user_pages_fast(), you
      must also implement the atomic version __get_user_pages_fast()
      otherwise you end up using the weak symbol fallback implementation
      which simply returns zero.
      
      This is dangerous, because it causes the futex code to loop forever
      if transparent hugepages are supported (see get_futex_key()).
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      06090e8e
    • D
      sparc64: Fix register corruption in top-most kernel stack frame during boot. · ef3e035c
      David S. Miller 提交于
      Meelis Roos reported that kernels built with gcc-4.9 do not boot, we
      eventually narrowed this down to only impacting machines using
      UltraSPARC-III and derivitive cpus.
      
      The crash happens right when the first user process is spawned:
      
      [   54.451346] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
      [   54.451346]
      [   54.571516] CPU: 1 PID: 1 Comm: init Not tainted 3.16.0-rc2-00211-gd7933ab7 #96
      [   54.666431] Call Trace:
      [   54.698453]  [0000000000762f8c] panic+0xb0/0x224
      [   54.759071]  [000000000045cf68] do_exit+0x948/0x960
      [   54.823123]  [000000000042cbc0] fault_in_user_windows+0xe0/0x100
      [   54.902036]  [0000000000404ad0] __handle_user_windows+0x0/0x10
      [   54.978662] Press Stop-A (L1-A) to return to the boot prom
      [   55.050713] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
      
      Further investigation showed that compiling only per_cpu_patch() with
      an older compiler fixes the boot.
      
      Detailed analysis showed that the function is not being miscompiled by
      gcc-4.9, but it is using a different register allocation ordering.
      
      With the gcc-4.9 compiled function, something during the code patching
      causes some of the %i* input registers to get corrupted.  Perhaps
      we have a TLB miss path into the firmware that is deep enough to
      cause a register window spill and subsequent restore when we get
      back from the TLB miss trap.
      
      Let's plug this up by doing two things:
      
      1) Stop using the firmware stack for client interface calls into
         the firmware.  Just use the kernel's stack.
      
      2) As soon as we can, call into a new function "start_early_boot()"
         to put a one-register-window buffer between the firmware's
         deepest stack frame and the top-most initial kernel one.
      Reported-by: NMeelis Roos <mroos@linux.ee>
      Tested-by: NMeelis Roos <mroos@linux.ee>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ef3e035c
  11. 24 10月, 2014 1 次提交