1. 03 May, 2011 13 commits
  2. 20 Apr, 2011 2 commits
  3. 17 Apr, 2011 10 commits
  4. 15 Apr, 2011 2 commits
    • Joerg Roedel's avatar
      x86, amd: Disable GartTlbWlkErr when BIOS forgets it · 5bbc097d
      Joerg Roedel authored
      This patch disables GartTlbWlk errors on AMD Fam10h CPUs if
      the BIOS forgets to do is (or is just too old). Letting
      these errors enabled can cause a sync-flood on the CPU
      causing a reboot.
      
      The AMD BKDG recommends disabling GART TLB Wlk Error completely.
      
      This patch is the fix for
      
      	https://bugzilla.kernel.org/show_bug.cgi?id=33012
      
      
      
      on my machine.
      Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
      Link: http://lkml.kernel.org/r/20110415131152.GJ18463@8bytes.org
      
      Tested-by: default avatarAlexandre Demers <alexandre.f.demers@gmail.com>
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      5bbc097d
    • KOSAKI Motohiro's avatar
      x86, NUMA: Fix fakenuma boot failure · 7d6b4670
      KOSAKI Motohiro authored
      Currently, numa=fake boot parameter is broken. If it's used,
      kernel may panic due to devide by zero error depending on CPU
      configuration
      
      Call Trace:
       [<ffffffff8104ad4c>] find_busiest_group+0x38c/0xd30
       [<ffffffff81086aff>] ? local_clock+0x6f/0x80
       [<ffffffff81050533>] load_balance+0xa3/0x600
       [<ffffffff81050f53>] idle_balance+0xf3/0x180
       [<ffffffff81550092>] schedule+0x722/0x7d0
       [<ffffffff81550538>] ? wait_for_common+0x128/0x190
       [<ffffffff81550a65>] schedule_timeout+0x265/0x320
       [<ffffffff81095815>] ? lock_release_holdtime+0x35/0x1a0
       [<ffffffff81550538>] ? wait_for_common+0x128/0x190
       [<ffffffff8109bb6c>] ? __lock_release+0x9c/0x1d0
       [<ffffffff815534e0>] ? _raw_spin_unlock_irq+0x30/0x40
       [<ffffffff815534e0>] ? _raw_spin_unlock_irq+0x30/0x40
       [<ffffffff81550540>] wait_for_common+0x130/0x190
       [<ffffffff81051920>] ? try_to_wake_up+0x510/0x510
       [<ffffffff8155067d>] wait_for_completion+0x1d/0x20
       [<ffffffff8107f36c>] kthread_create_on_node+0xac/0x150
       [<ffffffff81077bb0>] ? process_scheduled_works+0x40/0x40
       [<ffffffff8155045f>] ? wait_for_common+0x4f/0x190
       [<ffffffff8107a283>] __alloc_workqueue_key+0x1a3/0x590
       [<ffffffff81e0cce2>] cpuset_init_smp+0x6b/0x7b
       [<ffffffff81df3d07>] kernel_init+0xc3/0x182
       [<ffffffff8155d5e4>] kernel_thread_helper+0x4/0x10
       [<ffffffff81553cd4>] ? retint_restore_args+0x13/0x13
       [<ffffffff81df3c44>] ? start_kernel+0x400/0x400
       [<ffffffff8155d5e0>] ? gs_change+0x13/0x13
      
      The divede by zero is caused by the following line,
      group->cpu_power==0:
      
       kernel/sched_fair.c::update_sg_lb_stats()
              /* Adjust by relative CPU power of the group */
              sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
      
      This regression was caused by commit e23bba60
      
       ("x86-64, NUMA: Unify
      emulated distance mapping") because it changes cpu -> node
      mapping in the process of dropping fake_physnodes().
      
        old) all cpus are assinged node 0
        now) cpus are assigned round robin
             (the logic is implemented by numa_init_array())
      
        Note: The change in behavior only happens if the system doesn't
              have neither ACPI SRAT table nor AMD northbridge NUMA
      	information.
      
      Round robin assignment doesn't work because init_numa_sched_groups_power()
      assumes all logical cpus in the same physical cpu share the same node
      (then it only accounts for group_first_cpu()), and the simple round robin
      breaks the above assumption.
      
      Thus, this patch implements a reassignment of node-ids if buggy firmware
      or numa emulation makes wrong cpu node map. Tt enforce all logical cpus
      in the same physical cpu share the same node.
      Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Shaohui Zheng <shaohui.zheng@intel.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: H. Peter Anvin <hpa@linux.intel.com>
      Link: http://lkml.kernel.org/r/20110415203928.1303.A69D9226@jp.fujitsu.com
      
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      7d6b4670
  5. 14 Apr, 2011 7 commits
  6. 13 Apr, 2011 6 commits