1. 09 10月, 2012 2 次提交
    • S
      atomic: implement generic atomic_dec_if_positive() · e79bee24
      Shaohua Li 提交于
      The x86 implementation of atomic_dec_if_positive is quite generic, so make
      it available to all architectures.
      
      This is needed for "swap: add a simple detector for inappropriate swapin
      readahead".
      
      [akpm@linux-foundation.org: do the "#define foo foo" trick in the conventional manner]
      Signed-off-by: NShaohua Li <shli@fusionio.com>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Michal Simek <monstr@monstr.eu>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e79bee24
    • W
      mm: hugetlb: add arch hook for clearing page flags before entering pool · 5d3a551c
      Will Deacon 提交于
      The core page allocator ensures that page flags are zeroed when freeing
      pages via free_pages_check.  A number of architectures (ARM, PPC, MIPS)
      rely on this property to treat new pages as dirty with respect to the data
      cache and perform the appropriate flushing before mapping the pages into
      userspace.
      
      This can lead to cache synchronisation problems when using hugepages,
      since the allocator keeps its own pool of pages above the usual page
      allocator and does not reset the page flags when freeing a page into the
      pool.
      
      This patch adds a new architecture hook, arch_clear_hugepage_flags, so
      that architectures which rely on the page flags being in a particular
      state for fresh allocations can adjust the flags accordingly when a page
      is freed into the pool.
      Signed-off-by: NWill Deacon <will.deacon@arm.com>
      Cc: Michal Hocko <mhocko@suse.cz>
      Reviewed-by: NMichal Hocko <mhocko@suse.cz>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      5d3a551c
  2. 06 10月, 2012 2 次提交
  3. 04 10月, 2012 1 次提交
  4. 03 10月, 2012 2 次提交
  5. 27 9月, 2012 1 次提交
  6. 18 9月, 2012 5 次提交
    • G
      powerpc/eeh: Fix crash on converting OF node to edev · 1e38b714
      Gavin Shan 提交于
      The kernel crash was reported by Alexy. He was testing some feature
      with private kernel, in which Alexy added some code in pci_pm_reset()
      to read the CSR after writting it. The bug could be reproduced on
      Fiber Channel card (Fibre Channel: Emulex Corporation Saturn-X:
      LightPulse Fibre Channel Host Adapter (rev 03)) by the following
      commands.
      
      	# echo 1 > /sys/devices/pci0004:01/0004:01:00.0/reset
      	# rmmod lpfc
      	# modprobe lpfc
      
      The history behind the test case is that those additional config
      space reading operations in pci_pm_reset() would cause EEH error,
      but we didn't detect EEH error until "modprobe lpfc". For the case,
      all the PCI devices on PCI bus (0004:01) were removed and added after
      PE reset. Then the EEH devices would be figured out again based on
      the OF nodes. Unfortunately, there were some child OF nodes under
      PCI device (0004:01:00.0), but they didn't have attached PCI_DN since
      they're invisible from PCI domain. However, we were still trying to
      convert OF node to EEH device without checking on the attached PCI_DN.
      Eventually, it caused the kernel crash as follows:
      
      Unable to handle kernel paging request for data at address 0x00000030
      Faulting instruction address: 0xc00000000004d888
      cpu 0x0: Vector: 300 (Data Access) at [c000000fc797b950]
          pc: c00000000004d888: .eeh_add_device_tree_early+0x78/0x140
          lr: c00000000004d880: .eeh_add_device_tree_early+0x70/0x140
          sp: c000000fc797bbd0
         msr: 8000000000009032
         dar: 30
       dsisr: 40000000
        current = 0xc000000fc78d9f70
        paca    = 0xc00000000edb0000   softe: 0        irq_happened: 0x00
          pid   = 2951, comm = eehd
      enter ? for help
      [c000000fc797bc50] c00000000004d848 .eeh_add_device_tree_early+0x38/0x140
      [c000000fc797bcd0] c00000000004d848 .eeh_add_device_tree_early+0x38/0x140
      [c000000fc797bd50] c000000000051b54 .pcibios_add_pci_devices+0x34/0x190
      [c000000fc797bde0] c00000000004fb10 .eeh_reset_device+0x100/0x160
      [c000000fc797be70] c0000000000502dc .eeh_handle_event+0x19c/0x300
      [c000000fc797bf00] c000000000050570 .eeh_event_handler+0x130/0x1a0
      [c000000fc797bf90] c000000000020138 .kernel_thread+0x54/0x70
      
      The patch changes of_node_to_eeh_dev() and just returns NULL if the
      passed OF node doesn't have attached PCI_DN.
      
      Cc: stable@vger.kernel.org
      Reported-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      1e38b714
    • T
      powerpc/kprobe: Introduce a new thread flag · f0d1128f
      Tiejun Chen 提交于
      We need to add a new thread flag, TIF_EMULATE_STACK_STORE,
      for emulating stack store operation while exiting exception.
      Signed-off-by: NTiejun Chen <tiejun.chen@windriver.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      f0d1128f
    • B
      powerpc: Remove unused __get_user64() and __put_user64() · 52ab3b2b
      Bharat Bhushan 提交于
      __get_user64()  and __put_user64() are not used.
      Signed-off-by: NBharat Bhushan <bharat.bhushan@freescale.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      52ab3b2b
    • G
      powerpc/eeh: Remove EEH PE for normal PCI hotplug · 20ee6a97
      Gavin Shan 提交于
      Function eeh_rmv_from_parent_pe() could be called by the path of
      either normal PCI hotplug, or EEH recovery. For the former case,
      we need purge the corresponding PE on removal of the associated
      PE bus.
      
      The patch tries to cover that by passing more information to function
      pcibios_remove_pci_devices() so that we know if the corresponding PE
      needs to be purged or be marked as "invalid".
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      20ee6a97
    • G
      powerpc/eeh: Introduce EEH_PE_INVALID type PE · 5efc3ad7
      Gavin Shan 提交于
      When EEH error happens on the PE whose PCI devices don't have
      attached drivers. In function eeh_handle_event(), the default
      value PCI_ERS_RESULT_NONE will be returned after iterating all
      drivers of those PCI devices belonging to the PE. Actually, we
      don't have installed drivers for the PCI devices. Under the
      circumstance, we will remove the corresponding PCI bus of the PE,
      including the associated EEH devices and PE instance. However,
      we still need the information stored in the PE instance to do PE
      reset after that. So it's unsafe to free the PE instance.
      
      The patch introduces EEH_PE_INVALID type PE to address the issue.
      When the PCI bus and the corresponding attached EEH devices are
      removed, we will mark the PE as EEH_PE_INVALID. At later point,
      the PE will be changed to EEH_PE_DEVICE or EEH_PE_BUS when the
      corresponding EEH devices are attached again.
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      5efc3ad7
  7. 17 9月, 2012 9 次提交
  8. 14 9月, 2012 1 次提交
  9. 13 9月, 2012 7 次提交
  10. 12 9月, 2012 1 次提交
  11. 10 9月, 2012 9 次提交
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