1. 13 Mar, 2010 1 commit
    • Borislav Petkov's avatar
      x86, k8 nb: Fix boot crash: enable k8_northbridges unconditionally on AMD systems · 0e152cd7
      Borislav Petkov authored
      de957628 changed setting of the
      x86_init.iommu.iommu_init function ptr only when GART IOMMU is
      found.
      
      One side effect of it is that num_k8_northbridges
      is not initialized anymore if not explicitly
      called. This resulted in uninitialized pointers in
      <arch/x86/kernel/cpu/intel_cacheinfo.c:amd_calc_l3_indices()>,
      for example, which uses the num_k8_northbridges thing through
      node_to_k8_nb_misc().
      
      Fix that through an initcall that runs right after the PCI
      subsystem and does all the scanning. Then, remove initialization
      in gart_iommu_init() which is a rootfs_initcall and we're
      running before that.
      
      What is more, since num_k8_northbridges is being used in other
      places beside GART IOMMU, include it whenever we add AMD CPU
      support. The previous dependency chain in kconfig contained
      
      K8_NB depends on AGP_AMD64|GART_IOMMU
      
      which was clearly incorrect. The more natural way in terms of
      hardware dependency should be
      
      AGP_AMD64|GART_IOMMU depends on K8_NB depends on CPU_SUP_AMD &&
      PCI. Make it so Number One!
      Signed-off-by: default avatarBorislav Petkov <borislav.petkov@amd.com>
      Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Joerg Roedel <joerg.roedel@amd.com>
      LKML-Reference: <20100312144303.GA29262@aftab>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Tested-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
      0e152cd7
  2. 12 Mar, 2010 1 commit
  3. 11 Mar, 2010 2 commits
  4. 22 Feb, 2010 1 commit
    • Suresh Siddha's avatar
      x86_64, cpa: Don't work hard in preserving kernel 2M mappings when using 4K already · 281ff33b
      Suresh Siddha authored
      We currently enforce the !RW mapping for the kernel mapping that maps
      holes between different text, rodata and data sections. However, kernel
      identity mappings will have different RWX permissions to the pages mapping to
      text and to the pages padding (which are freed) the text, rodata sections.
      Hence kernel identity mappings will be broken to smaller pages. For 64-bit,
      kernel text and kernel identity mappings are different, so we can enable
      protection checks that come with CONFIG_DEBUG_RODATA, as well as retain 2MB
      large page mappings for kernel text.
      
      Konrad reported a boot failure with the Linux Xen paravirt guest because of
      this. In this paravirt guest case, the kernel text mapping and the kernel
      identity mapping share the same page-table pages. Thus forcing the !RW mapping
      for some of the kernel mappings also cause the kernel identity mappings to be
      read-only resulting in the boot failure. Linux Xen paravirt guest also
      uses 4k mappings and don't use 2M mapping.
      
      Fix this issue and retain large page performance advantage for native kernels
      by not working hard and not enforcing !RW for the kernel text mapping,
      if the current mapping is already using small page mapping.
      Reported-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
      LKML-Reference: <1266522700.2909.34.camel@sbs-t61.sc.intel.com>
      Tested-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: stable@kernel.org	[2.6.32, 2.6.33]
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      281ff33b
  5. 19 Feb, 2010 1 commit
    • Brandon Philips's avatar
      x86, irq: Keep chip_data in create_irq_nr and destroy_irq · eb5b3794
      Brandon Philips authored
      Version 4: use get_irq_chip_data() in destroy_irq() to get rid of some
      local vars.
      
      When two drivers are setting up MSI-X at the same time via
      pci_enable_msix() there is a race.  See this dmesg excerpt:
      
      [   85.170610] ixgbe 0000:02:00.1: irq 97 for MSI/MSI-X
      [   85.170611]   alloc irq_desc for 99 on node -1
      [   85.170613] igb 0000:08:00.1: irq 98 for MSI/MSI-X
      [   85.170614]   alloc kstat_irqs on node -1
      [   85.170616] alloc irq_2_iommu on node -1
      [   85.170617]   alloc irq_desc for 100 on node -1
      [   85.170619]   alloc kstat_irqs on node -1
      [   85.170621] alloc irq_2_iommu on node -1
      [   85.170625] ixgbe 0000:02:00.1: irq 99 for MSI/MSI-X
      [   85.170626]   alloc irq_desc for 101 on node -1
      [   85.170628] igb 0000:08:00.1: irq 100 for MSI/MSI-X
      [   85.170630]   alloc kstat_irqs on node -1
      [   85.170631] alloc irq_2_iommu on node -1
      [   85.170635]   alloc irq_desc for 102 on node -1
      [   85.170636]   alloc kstat_irqs on node -1
      [   85.170639] alloc irq_2_iommu on node -1
      [   85.170646] BUG: unable to handle kernel NULL pointer dereference
      at 0000000000000088
      
      As you can see igb and ixgbe are both alternating on create_irq_nr()
      via pci_enable_msix() in their probe function.
      
      ixgbe: While looping through irq_desc_ptrs[] via create_irq_nr() ixgbe
      choses irq_desc_ptrs[102] and exits the loop, drops vector_lock and
      calls dynamic_irq_init. Then it sets irq_desc_ptrs[102]->chip_data =
      NULL via dynamic_irq_init().
      
      igb: Grabs the vector_lock now and starts looping over irq_desc_ptrs[]
      via create_irq_nr(). It gets to irq_desc_ptrs[102] and does this:
      
      	cfg_new = irq_desc_ptrs[102]->chip_data;
      	if (cfg_new->vector != 0)
      		continue;
      
      This hits the NULL deref.
      
      Another possible race exists via pci_disable_msix() in a driver or in
      the number of error paths that call free_msi_irqs():
      
      destroy_irq()
      dynamic_irq_cleanup() which sets desc->chip_data = NULL
      ...race window...
      desc->chip_data = cfg;
      
      Remove the save and restore code for cfg in create_irq_nr() and
      destroy_irq() and take the desc->lock when checking the irq_cfg.
      Reported-and-analyzed-by: default avatarBrandon Philips <bphilips@suse.de>
      Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
      LKML-Reference: <20100207210250.GB8256@jenkins.home.ifup.org>
      Signed-off-by: default avatarBrandon Phiilps <bphilips@suse.de>
      Cc: stable@kernel.org
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      eb5b3794
  6. 17 Feb, 2010 1 commit
  7. 10 Feb, 2010 4 commits
    • Yinghai Lu's avatar
      x86: Fix SCI on IOAPIC != 0 · 18dce6ba
      Yinghai Lu authored
      Thomas Renninger <trenn@suse.de> reported on IBM x3330
      
      booting a latest kernel on this machine results in:
      
      PCI: PCI BIOS revision 2.10 entry at 0xfd61c, last bus=1
      PCI: Using configuration type 1 for base access bio: create slab <bio-0> at 0
      ACPI: SCI (IRQ30) allocation failed
      ACPI Exception: AE_NOT_ACQUIRED, Unable to install System Control Interrupt handler (20090903/evevent-161)
      ACPI: Unable to start the ACPI Interpreter
      
      Later all kind of devices fail...
      
      and bisect it down to this commit:
      commit b9c61b70
      
          x86/pci: update pirq_enable_irq() to setup io apic routing
      
      it turns out we need to set irq routing for the sci on ioapic1 early.
      
      -v2: make it work without sparseirq too.
      -v3: fix checkpatch.pl warning, and cc to stable
      Reported-by: default avatarThomas Renninger <trenn@suse.de>
      Bisected-by: default avatarThomas Renninger <trenn@suse.de>
      Tested-by: default avatarThomas Renninger <trenn@suse.de>
      Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
      LKML-Reference: <1265793639-15071-2-git-send-email-yinghai@kernel.org>
      Cc: stable@kernel.org
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      18dce6ba
    • Jiri Slaby's avatar
      x86, ia32_aout: do not kill argument mapping · 318f6b22
      Jiri Slaby authored
      Do not set current->mm->mmap to NULL in 32-bit emulation on 64-bit
      load_aout_binary after flush_old_exec as it would destroy already
      set brpm mapping with arguments.
      
      Introduced by b6a2fea3
      mm: variable length argument support
      where the argument mapping in bprm was added.
      
      [ hpa: this is a regression from 2.6.22... time to kill a.out? ]
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      LKML-Reference: <1265831716-7668-1-git-send-email-jslaby@suse.cz>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ollie Wild <aaw@google.com>
      Cc: x86@kernel.org
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      318f6b22
    • Suresh Siddha's avatar
      x86, apic: Don't use logical-flat mode when CPU hotplug may exceed 8 CPUs · 681ee44d
      Suresh Siddha authored
      We need to fall back from logical-flat APIC mode to physical-flat mode
      when we have more than 8 CPUs.  However, in the presence of CPU
      hotplug(with bios listing not enabled but possible cpus as disabled cpus in
      MADT), we have to consider the number of possible CPUs rather than
      the number of current CPUs; otherwise we may cross the 8-CPU boundary
      when CPUs are added later.
      
      32bit apic code can use more cleanups (like the removal of vendor checks in
      32bit default_setup_apic_routing()) and more unifications with 64bit code.
      Yinghai has some patches in works already. This patch addresses the boot issue
      that is reported in the virtualization guest context.
      
      [ hpa: incorporated function annotation feedback from Yinghai Lu ]
      Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
      LKML-Reference: <1265767304.2833.19.camel@sbs-t61.sc.intel.com>
      Acked-by: default avatarShaohui Zheng <shaohui.zheng@intel.com>
      Reviewed-by: default avatarYinghai Lu <yinghai@kernel.org>
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      681ee44d
    • Serge E. Hallyn's avatar
      x86-32: Make AT_VECTOR_SIZE_ARCH=2 · cf9db6c4
      Serge E. Hallyn authored
      Both x86-32 and x86-64 with 32-bit compat use ARCH_DLINFO_IA32,
      which defines two saved_auxv entries.  But system.h only defines
      AT_VECTOR_SIZE_ARCH as 2 for CONFIG_IA32_EMULATION, not for
      CONFIG_X86_32.  Fix that.
      Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
      LKML-Reference: <20100209023502.GA15408@us.ibm.com>
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      cf9db6c4
  8. 04 Feb, 2010 1 commit
  9. 03 Feb, 2010 1 commit
  10. 02 Feb, 2010 14 commits
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block · 1a45dcfe
      Linus Torvalds authored
      * 'for-linus' of git://git.kernel.dk/linux-2.6-block:
        cfq-iosched: Do not idle on async queues
        blk-cgroup: Fix potential deadlock in blk-cgroup
        block: fix bugs in bio-integrity mempool usage
        block: fix bio_add_page for non trivial merge_bvec_fn case
        drbd: null dereference bug
        drbd: fix max_segment_size initialization
      1a45dcfe
    • Nick Piggin's avatar
      mm: purge fragmented percpu vmap blocks · 02b709df
      Nick Piggin authored
      Improve handling of fragmented per-CPU vmaps.  We previously don't free
      up per-CPU maps until all its addresses have been used and freed.  So
      fragmented blocks could fill up vmalloc space even if they actually had
      no active vmap regions within them.
      
      Add some logic to allow all CPUs to have these blocks purged in the case
      of failure to allocate a new vm area, and also put some logic to trim
      such blocks of a current CPU if we hit them in the allocation path (so
      as to avoid a large build up of them).
      
      Christoph reported some vmap allocation failures when using the per CPU
      vmap APIs in XFS, which cannot be reproduced after this patch and the
      previous bug fix.
      
      Cc: linux-mm@kvack.org
      Cc: stable@kernel.org
      Tested-by: default avatarChristoph Hellwig <hch@infradead.org>
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      --
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      02b709df
    • Nick Piggin's avatar
      mm: percpu-vmap fix RCU list walking · de560423
      Nick Piggin authored
      RCU list walking of the per-cpu vmap cache was broken.  It did not use
      RCU primitives, and also the union of free_list and rcu_head is
      obviously wrong (because free_list is indeed the list we are RCU
      walking).
      
      While we are there, remove a couple of unused fields from an earlier
      iteration.
      
      These APIs aren't actually used anywhere, because of problems with the
      XFS conversion.  Christoph has now verified that the problems are solved
      with these patches.  Also it is an exported interface, so I think it
      will be good to be merged now (and Christoph wants to get the XFS
      changes into their local tree).
      
      Cc: stable@kernel.org
      Cc: linux-mm@kvack.org
      Tested-by: default avatarChristoph Hellwig <hch@infradead.org>
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      --
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      de560423
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 489b24f2
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        random: Remove unused inode variable
        crypto: padlock-sha - Add import/export support
        random: drop weird m_time/a_time manipulation
      489b24f2
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-fixes · 4dab75ec
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-fixes:
        GFS2: Use GFP_NOFS for alloc structure
        GFS2: Fix previous patch
        GFS2: Don't withdraw on partial rindex entries
        GFS2: Fix refcnt leak on gfs2_follow_link() error path
      4dab75ec
    • Linus Torvalds's avatar
      Merge branch 'sh/for-2.6.33' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 · 7fbcca25
      Linus Torvalds authored
      * 'sh/for-2.6.33' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
        sh: Fix access to released memory in clk_debugfs_register_one()
        sh: Fix access to released memory in dwarf_unwinder_cleanup()
        usb: r8a66597-hdc disable interrupts fix
        spi: spi_sh_msiof: Fixed data sampling on the correct edge
      7fbcca25
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus · e770a0f1
      Linus Torvalds authored
      * 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
        MIPS: 64-bit: Detect virtual memory size
        MIPS: AR7: Fix USB slave mem range typo
        MIPS: Alchemy: Fix dbdma ring destruction memory debugcheck.
      e770a0f1
    • Linus Torvalds's avatar
      Fix 'flush_old_exec()/setup_new_exec()' split · 7ab02af4
      Linus Torvalds authored
      Commit 221af7f8 ("Split 'flush_old_exec' into two functions") split
      the function at the point of no return - ie right where there were no
      more error cases to check.  That made sense from a technical standpoint,
      but when we then also combined it with the actual personality setting
      going in between flush_old_exec() and setup_new_exec(), it needs to be a
      bit more careful.
      
      In particular, we need to make sure that we really flush the old
      personality bits in the 'flush' stage, rather than later in the 'setup'
      stage, since otherwise we might be flushing the _new_ personality state
      that we're just setting up.
      
      So this moves the flags and personality flushing (and 'flush_thread()',
      which is the arch-specific function that generally resets lazy FP state
      etc) of the old process into flush_old_exec(), so that it doesn't affect
      any state that execve() is setting up for the new process environment.
      
      This was reported by Michal Simek as breaking his Microblaze qemu
      environment.
      Reported-and-tested-by: default avatarMichal Simek <michal.simek@petalogix.com>
      Cc: Peter Anvin <hpa@zytor.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7ab02af4
    • Vivek Goyal's avatar
      cfq-iosched: Do not idle on async queues · 1efe8fe1
      Vivek Goyal authored
      Few weeks back, Shaohua Li had posted similar patch. I am reposting it
      with more test results.
      
      This patch does two things.
      
      - Do not idle on async queues.
      
      - It also changes the write queue depth CFQ drives (cfq_may_dispatch()).
        Currently, we seem to driving queue depth of 1 always for WRITES. This is
        true even if there is only one write queue in the system and all the logic
        of infinite queue depth in case of single busy queue as well as slowly
        increasing queue depth based on last delayed sync request does not seem to
        be kicking in at all.
      
      This patch will allow deeper WRITE queue depths (subjected to the other
      WRITE queue depth contstraints like cfq_quantum and last delayed sync
      request).
      
      Shaohua Li had reported getting more out of his SSD. For me, I have got
      one Lun exported from an HP EVA and when pure buffered writes are on, I
      can get more out of the system. Following are test results of pure
      buffered writes (with end_fsync=1) with vanilla and patched kernel. These
      results are average of 3 sets of run with increasing number of threads.
      
      AVERAGE[bufwfs][vanilla]
      -------
      job       Set NR  ReadBW(KB/s)   MaxClat(us)    WriteBW(KB/s)  MaxClat(us)
      ---       --- --  ------------   -----------    -------------  -----------
      bufwfs    3   1   0              0              95349          474141
      bufwfs    3   2   0              0              100282         806926
      bufwfs    3   4   0              0              109989         2.7301e+06
      bufwfs    3   8   0              0              116642         3762231
      bufwfs    3   16  0              0              118230         6902970
      
      AVERAGE[bufwfs] [patched kernel]
      -------
      bufwfs    3   1   0              0              270722         404352
      bufwfs    3   2   0              0              206770         1.06552e+06
      bufwfs    3   4   0              0              195277         1.62283e+06
      bufwfs    3   8   0              0              260960         2.62979e+06
      bufwfs    3   16  0              0              299260         1.70731e+06
      
      I also ran buffered writes along with some sequential reads and some
      buffered reads going on in the system on a SATA disk because the potential
      risk could be that we should not be driving queue depth higher in presence
      of sync IO going to keep the max clat low.
      
      With some random and sequential reads going on in the system on one SATA
      disk I did not see any significant increase in max clat. So it looks like
      other WRITE queue depth control logic is doing its job. Here are the
      results.
      
      AVERAGE[brr, bsr, bufw together] [vanilla]
      -------
      job       Set NR  ReadBW(KB/s)   MaxClat(us)    WriteBW(KB/s)  MaxClat(us)
      ---       --- --  ------------   -----------    -------------  -----------
      brr       3   1   850            546345         0              0
      bsr       3   1   14650          729543         0              0
      bufw      3   1   0              0              23908          8274517
      
      brr       3   2   981.333        579395         0              0
      bsr       3   2   14149.7        1175689        0              0
      bufw      3   2   0              0              21921          1.28108e+07
      
      brr       3   4   898.333        1.75527e+06    0              0
      bsr       3   4   12230.7        1.40072e+06    0              0
      bufw      3   4   0              0              19722.3        2.4901e+07
      
      brr       3   8   900            3160594        0              0
      bsr       3   8   9282.33        1.91314e+06    0              0
      bufw      3   8   0              0              18789.3        23890622
      
      AVERAGE[brr, bsr, bufw mixed] [patched kernel]
      -------
      job       Set NR  ReadBW(KB/s)   MaxClat(us)    WriteBW(KB/s)  MaxClat(us)
      ---       --- --  ------------   -----------    -------------  -----------
      brr       3   1   837            417973         0              0
      bsr       3   1   14357.7        591275         0              0
      bufw      3   1   0              0              24869.7        8910662
      
      brr       3   2   1038.33        543434         0              0
      bsr       3   2   13351.3        1205858        0              0
      bufw      3   2   0              0              18626.3        13280370
      
      brr       3   4   913            1.86861e+06    0              0
      bsr       3   4   12652.3        1430974        0              0
      bufw      3   4   0              0              15343.3        2.81305e+07
      
      brr       3   8   890            2.92695e+06    0              0
      bsr       3   8   9635.33        1.90244e+06    0              0
      bufw      3   8   0              0              17200.3        24424392
      
      So looks like it might make sense to include this patch.
      
      Thanks
      Vivek
      Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      1efe8fe1
    • Guenter Roeck's avatar
      MIPS: 64-bit: Detect virtual memory size · 91dfc423
      Guenter Roeck authored
      Linux kernel 2.6.32 and later allocate address space from the top of the
      kernel virtual memory address space.
      
      This patch implements virtual memory size detection for 64 bit MIPS CPUs
      to avoid resulting crashes.
      Signed-off-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
      Cc: linux-mips@linux-mips.org
      Patchwork: http://patchwork.linux-mips.org/patch/935/Reviewed-by: default avatarDavid Daney <ddaney@caviumnetworks.com>
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      91dfc423
    • Marek Skuczynski's avatar
    • Marek Skuczynski's avatar
    • Magnus Damm's avatar
      usb: r8a66597-hdc disable interrupts fix · e5ff15be
      Magnus Damm authored
      This patch improves disable_controller() in the r8a66597-hdc
      driver to disable all interrupts and clear status flags. It
      also makes sure that disable_controller() is called during
      probe(). This fixes the relatively rare case of unexpected
      pending interrupts after kexec reboot.
      Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
      Acked-by: default avatarYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
      Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
      e5ff15be
    • Markus Pietrek's avatar
      spi: spi_sh_msiof: Fixed data sampling on the correct edge · e8708ef7
      Markus Pietrek authored
      The spi_sh_msiof.c driver presently misconfigures REDG and TEDG. TEDG==0
      outputs data at the **rising edge** of the clock and REDG==0 samples data
      at the **falling edge** of the clock. Therefore for SPI, TEDG must be
      equal to REDG, otherwise the last byte received is not sampled in SPI
      mode 3.
      
      This brings the driver in line with the SH7723 HW Reference Manual
      settings documented in Figures 20.20 and 20.21 ("SPI Clock and data
      timing").
      Signed-off-by: default avatarMarkus Pietrek <Markus.Pietrek@emtrion.de>
      Acked-by: default avatarMagnus Damm <damm@opensource.se>
      Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
      e8708ef7
  11. 01 Feb, 2010 13 commits