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* topic/huang-d3cold-v7:
PCI/PM: add PCIe runtime D3cold support
PCI: do not call pci_set_power_state with PCI_D3cold
PCI/PM: add runtime PM support to PCIe port
ACPI/PM: specify lowest allowed state for device sleep state
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This patch adds runtime D3cold support and corresponding ACPI platform
support. This patch only enables runtime D3cold support; it does not
enable D3cold support during system suspend/hibernate.
D3cold is the deepest power saving state for a PCIe device, where its main
power is removed. While it is in D3cold, you can't access the device at
all, not even its configuration space (which is still accessible in D3hot).
Therefore the PCI PM registers can not be used to transition into/out of
the D3cold state; that must be done by platform logic such as ACPI _PR3.
To support wakeup from D3cold, a system may provide auxiliary power, which
allows a device to request wakeup using a Beacon or the sideband WAKE#
signal. WAKE# is usually connected to platform logic such as ACPI GPE.
This is quite different from other power saving states, where devices
request wakeup via a PME message on the PCIe link.
Some devices, such as those in plug-in slots, have no direct platform
logic. For example, there is usually no ACPI _PR3 for them. D3cold
support for these devices can be done via the PCIe Downstream Port leading
to the device. When the PCIe port is powered on/off, the device is powered
on/off too. Wakeup events from the device will be notified to the
corresponding PCIe port.
For more information about PCIe D3cold and corresponding ACPI support,
please refer to:
- PCI Express Base Specification Revision 2.0
- Advanced Configuration and Power Interface Specification Revision 5.0
[bhelgaas: changelog]
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Originally-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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PCI subsystem has not been ready for D3cold support yet. So
PCI_D3cold should not be used as parameter for pci_set_power_state.
This patch is needed for upcoming PCI_D3cold support.
This patch has no functionality change, because pci_set_power_state
will bound the parameter to PCI_D3hot too.
CC: Michal Miroslaw <mirq-linux@rere.qmqm.pl>
CC: Jesse Barnes <jesse.barnes@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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This patch adds runtime PM support to PCIe port. This is needed by
PCIe D3cold support, where PCIe device without ACPI node may be
powered on/off by PCIe port.
Because runtime suspend is broken for some chipsets, a black list is
used to disable runtime PM support for these chipsets.
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Lower device sleep state can save more power, but has more exit
latency too. Sometimes, to satisfy some power QoS and other
requirement, we need to constrain the lowest device sleep state.
In this patch, a parameter to specify lowest allowed state for
acpi_pm_device_sleep_state is added. So that the caller can enforce
the constraint via the parameter.
This is needed by PCIe D3cold support, where the lowest power state
allowed may be D3_HOT instead of default D3_COLD.
CC: Len Brown <lenb@kernel.org>
CC: linux-acpi@vger.kernel.org
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/jiang-mmconfig-v10:
ACPI: mark acpi_sfi_table_parse() as __init
x86/PCI: use pr_level() to replace printk(KERN_LEVEL)
x86/PCI: refine __pci_mmcfg_init() for better code readability
x86/PCI: get rid of redundant log messages
x86/PCI: simplify pci_mmcfg_late_insert_resources()
x86/PCI: update MMCONFIG information when hot-plugging PCI host bridges
PCI/ACPI: provide MMCONFIG address for PCI host bridges
x86/PCI: add pci_mmconfig_insert()/delete() for PCI root bridge hotplug
x86/PCI: prepare pci_mmcfg_check_reserved() to be called at runtime
x86/PCI: introduce pci_mmcfg_arch_map()/pci_mmcfg_arch_unmap()
x86/PCI: use RCU list to protect mmconfig list
x86/PCI: split out pci_mmconfig_alloc() for code reuse
x86/PCI: split out pci_mmcfg_check_reserved() for code reuse
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This patch provide MMCONFIG address for PCI host bridges, which will
be used to support host bridge hotplug. It gets MMCONFIG address
by evaluating _CBA method if available.
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/bjorn-trivial:
PCI: remove useless pcix_set_mmrbc() dev->bus check
PCI: acpiphp: check whether _ADR evaluation succeeded
PCI: shpchp: remove dead code
PCI: fix P2P bridge I/O port window sign extension
PCI: fix upstream P2P bridge checks when enabling OBFF and LTR
PCI: use __weak consistently
PCI: cleanup assign_requested_resources_sorted() kernel-doc warning
sparc/PCI: remove unused pcibios_assign_resource() definition
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For a valid pci_dev, dev->bus != NULL always, so remove this
unnecessary test.
Found by Coverity (CID 101680).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Check whether we evaluated _ADR successfully. Previously we ignored
failure, so we would have used garbage data from the stack as the device
and function number.
We return AE_OK so that we ignore only this slot and continue looking
for other slots.
Found by Coverity (CID 113981).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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"slots_not_empty" is initialized to zero and can't be set again before
reaching this point, so this return statement is dead. Remove it.
Found by Coverity (CID 114324).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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On P2P bridges with 32-bit I/O decoding, we incorrectly sign-extended
windows starting at 0x80000000 or above. In "base |= (io_base_hi << 16)",
"io_base_hi" is promoted to a signed int before being extended to an
unsigned long.
This would cause a window starting at I/O address 0x80000000 to be
treated as though it started at 0xffffffff80008000 instead, which
should cause "no compatible bridge window" errors when we enumerate
devices using that I/O space.
The mmio and mmio_pref casts are not strictly necessary, but without
them, correctness depends on the types of the PCI_MEMORY_RANGE_MASK and
PCI_PREF_RANGE_MASK constants, which are not obvious from reading the
local code.
Found by Coverity (CID 138747 and CID 138748).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pci_enable_obff() and pci_enable_ltr() incorrectly check "dev->bus" instead
of "dev->bus->self" to determine whether the upstream device is a P2P
bridge or a host bridge. For devices on the root bus, the upstream device
is a host bridge, "dev->bus != NULL" and "dev->bus->self == NULL", and we
panic with a null pointer dereference.
These functions should previously have panicked when called on devices
supporting OBFF or LTR, so they should be regarded as untested.
Found by Coverity (CID 143038 and CID 143039).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use "__weak" instead of the gcc-specific "__attribute__ ((weak))"
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Warning(drivers/pci/setup-bus.c:277): No description found for parameter 'fail_head'
Warning(drivers/pci/setup-bus.c:277): Excess function parameter 'failed_list' description in 'assign_requested_resources_sorted'
Signed-off-by: Wanpeng Li <liwp.linux@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/jan-intx-masking:
PCI: add Ralink RT2800 broken INTx masking quirk
PCI: add Chelsio T310 10GbE NIC broken INTx masking quirk
PCI: add infrastructure for devices with broken INTx masking
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Passes pci_intx_mask_supported test but continues to send interrupts
as discovered through VFIO-based device assignment.
http://www.spinics.net/lists/kvm/msg73738.html
[bhelgaas: use HEADER, not FINAL, which is currently broken for hotplug]
Tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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According to
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/91388
the T310 does not properly support INTx masking as it fails to keep the
PCI_STATUS_INTERRUPT bit updated once the interrupt is masked. Mark this
adapter as broken so that pci_intx_mask_supported won't report it as
compatible.
[bhelgaas: use HEADER, not FINAL, which is currently broken for hotplug]
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pci_intx_mask_supported() assumes INTx masking is supported if the
PCI_COMMAND_INTX_DISABLE bit is writable. But when that bit is set,
some devices don't actually mask INTx or update PCI_STATUS_INTERRUPT
as we expect.
This patch adds a way for quirks to identify these broken devices.
[bhelgaas: split out from Chelsio quirk addition]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/sebastian-devinit-fixups:
scripts/modpost: check for bad references in .pci.fixups area
sh/PCI: move fixup hooks from __init to __devinit
powerpc/PCI: move fixup hooks from __init to __devinit
frv/PCI: move fixup hooks from __init to __devinit
arm/PCI: move fixup hooks from __init to __devinit
alpha/PCI: move fixup hooks from __init to __devinit
PCI: move fixup hooks from __init to __devinit
x86/PCI: move fixup hooks from __init to __devinit
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The fixups are executed once the pci-device is found which is during
boot process so __init seems fine as long as the platform does not
support hotplug.
However it is possible to remove the PCI bus at run time and have it
rediscovered again via "echo 1 > /sys/bus/pci/rescan" and this will call
the fixups again.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/stowe-cap-cleanup:
PCI: remove redundant capabilities checking in pci_{save, restore}_pcie_state
PCI: add pci_pcie_cap2() check for PCIe feature capabilities >= v2
PCI: remove redundant checking in PCI Express capability routines
PCI: make pci_ltr_supported() static
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Unlike PCI Express v1's Capabilities Structure, v2's requires the entire
structure to be implemented. In v2 structures, register fields that
are not implemented are present but hardwired to 0x0. These may
include: Link Capabilities, Status, and Control; Slot Capabilities,
Status, and Control; Root Capabilities, Status, and Control; and all of
the '2' (Device, Link, and Slot) Capabilities, Status, and Control
registers.
This patch removes the redundant capability checks corresponding to the
Link 2's and Slot 2's, Capabilities, Status, and Control registers as they
will be present if Device Capabilities 2's registers are (which explains
why the macros for each of the three are identical).
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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This patch resolves potential issues when accessing PCI Express
Capability structures. The makeup of the capability varies
substantially between v1 and v2:
Version 1 of the PCI Express Capability (defined by PCI Express
1.0 and 1.1 base) neither requires the endpoint to implement the
entire PCIe capability structure nor specifies default values of
registers that are not implemented by the device.
Version 2 of the PCI Express Capability (defined by PCIe 1.1
Capability Structure Expansion ECN, PCIe 2.0, 2.1, and 3.0) added
additional registers to the structure and requires all registers
to be either implemented or hardwired to 0.
Due to the differences in the capability structures, code dealing with
capability features must be careful not to access the additional
registers introduced with v2 unless the device is specifically known to
be a v2 capable device. Otherwise, attempts to access non-existant
registers will occur. This is a subtle issue that is hard to track down
when it occurs (and it has - see commit 864d296cf94).
To try and help mitigate such occurrences, this patch introduces
pci_pcie_cap2() which is similar to pci_pcie_cap() but also checks
that the PCIe capability version is >= 2. pci_pcie_cap2() should be
used for qualifying PCIe capability features introduced after v1.
Suggested by Don Dutile.
Acked-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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There are a number of redundant pci_is_pcie() checks in various PCI
Express capabilities related routines like the following:
if (!pci_is_pcie(dev))
return false;
pos = pci_pcie_cap(dev);
if (!pos)
return false;
The current pci_is_pcie() implementation is merely:
static inline bool pci_is_pcie(struct pci_dev *dev)
{
return !!pci_pcie_cap(dev);
}
so we can just drop the pci_is_pcie() test in such cases.
Acked-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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The PCI Express Latency Tolerance Reporting (LTR) feature's
pci_ltr_supported() routine is currently only used within
drivers/pci/pci.c so make it static.
Acked-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/alex-vfio-prep:
PCI: misc pci_reg additions
PCI: create common pcibios_err_to_errno
PCI: export pci_user functions for use by other drivers
PCI: add ACS validation utility
PCI: add PCI DMA source ID quirk
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For returning errors out to non-PCI code. Re-name xen's version.
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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VFIO PCI support will make use of these for user-initiated
PCI config accesses.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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In a PCI environment, transactions aren't always required to reach
the root bus before being re-routed. Intermediate switches between
an endpoint and the root bus can redirect DMA back downstream before
things like IOMMUs have a chance to intervene. Legacy PCI is always
susceptible to this as it operates on a shared bus. PCIe added a
new capability to describe and control this behavior, Access Control
Services, or ACS.
The utility function pci_acs_enabled() allows us to test the ACS
capabilities of an individual devices against a set of flags while
pci_acs_path_enabled() tests a complete path from a given downstream
device up to the specified upstream device. We also include the
ability to add device specific tests as it's likely we'll see
devices that do not implement ACS, but want to indicate support
for various capabilities in this space.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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DMA transactions are tagged with the source ID of the device making
the request. Occasionally hardware screws this up and uses the
source ID of a different device (often the wrong function number of
a multifunction device). A specific Ricoh multifunction device is
a prime example of this problem and included in this patch.
Given a pci_dev, this function returns the pci_dev to use as the
source ID for DMA. When hardware works correctly, this returns
the input device. For the components of the Ricoh multifunction
device, it returns the pci_dev for function 0.
This will be used by IOMMU drivers for determining the boundaries
of IOMMU groups as multiple devices using the same source ID must
be contained within the same group. This can also be used by
existing streaming DMA paths for the same purpose.
[bhelgaas: fold in pci_dev_get() for !CONFIG_PCI]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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* topic/bjorn-remove-unused:
PCI/AER: use pci_is_pcie() instead of obsolete pci_dev.is_pcie
PCI: remove pci_max_busnr() (was already commented out)
PCI: remove pci_bus_find_ext_capability() (unused)
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Use pci_is_pcie() instead of looking at obsolete is_pcie field in
struct pci_dev.
CC: Huang Ying <ying.huang@intel.com>
CC: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pci_max_busnr() has been commented out for years (since 54c762fe62), and
this patch removes it completely.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pci_bus_find_ext_capability() is unused, and this patch removes it.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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When we add a device with acpiphp, we enumerate all functions in the
slot with pci_scan_slot(), regardless of whether they have associated
ACPI methods such as _EJ0.
When removing the device, we previously removed only the functions
with those ACPI methods. This patch makes the remove symmetric with the
add: we remove all functions in the slot, whether they have associated
ACPI methods or not.
With qemu-kvm and SeaBIOS, we can build a multi-function device where
only function 0 has _EJ0 and _ADR (see bugzilla below). Removing and
re-adding that slot (including all functions of the device) works correctly
with Windows guests. This patch makes it also work in Linux guests.
[bhelgaas: restructure loop iteration, pull out of slot->funcs loop]
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=43219
Signed-off-by: Amos Kong <kongjianjun@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Previously, we acquired two references to function 0, but only released
one.
[bhelgaas: split this out from "remove all functions" fix]
Signed-off-by: Amos Kong <kongjianjun@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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All callers of pci_do_scan_bus() are gone, so remove it.
Note that pci_do_scan_bus() was exported, so out-of-tree modules could
depend on it.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Use the new generic pci_hp_add_bridge() interface.
[bhelgaas: split "add generic pci_hp_add_bridge()" into a separate patch]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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This creates a generic pci_hp_add_bridge() that can be used by several
hotplug drivers.
[bhelgaas: split out from pciehp patch]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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