A set of fixes that have been coming in over the last few weeks, the
usual mix of fixes:
- DT fixups for TI K3
- SATA drive detection fix for TI DRA7
- Power management fixes and a few build warning removals for OMAP
- OP-TEE fix to use standard API for UUID exporting
- DT fixes for a handful of i.MX boards
... plus a few other smaller items
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Merge tag 'arm-soc-fixes-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC fixes from Olof Johansson:
"A set of fixes that have been coming in over the last few weeks, the
usual mix of fixes:
- DT fixups for TI K3
- SATA drive detection fix for TI DRA7
- Power management fixes and a few build warning removals for OMAP
- OP-TEE fix to use standard API for UUID exporting
- DT fixes for a handful of i.MX boards
And a few other smaller items"
* tag 'arm-soc-fixes-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (29 commits)
arm64: meson: select COMMON_CLK
soc: amlogic: meson-clk-measure: remove redundant dev_err call in meson_msr_probe()
ARM: OMAP1: ams-delta: remove unused function ams_delta_camera_power
bus: ti-sysc: Fix flakey idling of uarts and stop using swsup_sidle_act
ARM: dts: imx: emcon-avari: Fix nxp,pca8574 #gpio-cells
ARM: dts: imx7d-pico: Fix the 'tuning-step' property
ARM: dts: imx7d-meerkat96: Fix the 'tuning-step' property
arm64: dts: freescale: sl28: var1: fix RGMII clock and voltage
arm64: dts: freescale: sl28: var4: fix RGMII clock and voltage
ARM: imx: pm-imx27: Include "common.h"
arm64: dts: zii-ultra: fix 12V_MAIN voltage
arm64: dts: zii-ultra: remove second GEN_3V3 regulator instance
arm64: dts: ls1028a: fix memory node
bus: ti-sysc: Fix am335x resume hang for usb otg module
ARM: OMAP2+: Fix build warning when mmc_omap is not built
ARM: OMAP1: isp1301-omap: Add missing gpiod_add_lookup_table function
ARM: OMAP1: Fix use of possibly uninitialized irq variable
optee: use export_uuid() to copy client UUID
arm64: dts: ti: k3*: Introduce reg definition for interrupt routers
arm64: dts: ti: k3-am65|j721e|am64: Map the dma / navigator subsystem via explicit ranges
...
These minor fixes include:
* Fixups for device tree discovered during yaml conversion
* Fixups for missing dma-coherent property in j7200
* Removal of camera sensor node from am65 evm dts to overlay
as camera sensor boards are variable.
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Merge tag 'ti-k3-dt-fixes-for-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nmenon/linux into arm/fixes
Devicetree fixes for TI K3 platforms for v5.13 merge window:
These minor fixes include:
* Fixups for device tree discovered during yaml conversion
* Fixups for missing dma-coherent property in j7200
* Removal of camera sensor node from am65 evm dts to overlay
as camera sensor boards are variable.
* tag 'ti-k3-dt-fixes-for-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nmenon/linux:
arm64: dts: ti: k3*: Introduce reg definition for interrupt routers
arm64: dts: ti: k3-am65|j721e|am64: Map the dma / navigator subsystem via explicit ranges
arm64: dts: ti: k3-*: Rename the TI-SCI node
arm64: dts: ti: k3-am65-wakeup: Drop un-necessary properties from dmsc node
arm64: dts: ti: k3-am65-wakeup: Add debug region to TI-SCI node
arm64: dts: ti: k3-*: Rename the TI-SCI clocks node name
arm64: dts: ti: j7200-main: Mark Main NAVSS as dma-coherent
arm64: dts: ti: k3-am654-base-board: remove ov5640
Link: https://lore.kernel.org/r/20210518115634.467vgpbzplal5kou@obituary
Signed-off-by: Olof Johansson <olof@lixom.net>
- Fix missing-prototypes warning of 'imx27_pm_init' in i.MX27 platform
pm code.
- A couple of patches from Fabio Estevam to fix 'tuning-step' property
in imx7d-meerkat96 and imx7d-pico DT.
- Fix '#gpio-cells' of nxp,pca8574 device in imx6qdl-emcon-avari DT.
- A couple of patches from Lucas Stach to fix regulator and voltage for
imx8mq-zii-ultra board.
- Add missing regulators for imx6q-dhcom to avoid possible instability
issues.
- Fix memory-controller settings for fsl-ls1028a DT.
- Fix RGMII clock and voltage for a couple of fsl-ls1028a-kontron-sl28
boards.
- Fix RGMII connection to QCA8334 switch for imx6dl-yapp4 board.
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Merge tag 'imx-fixes-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into arm/fixes
i.MX fixes for 5.13:
- Fix missing-prototypes warning of 'imx27_pm_init' in i.MX27 platform
pm code.
- A couple of patches from Fabio Estevam to fix 'tuning-step' property
in imx7d-meerkat96 and imx7d-pico DT.
- Fix '#gpio-cells' of nxp,pca8574 device in imx6qdl-emcon-avari DT.
- A couple of patches from Lucas Stach to fix regulator and voltage for
imx8mq-zii-ultra board.
- Add missing regulators for imx6q-dhcom to avoid possible instability
issues.
- Fix memory-controller settings for fsl-ls1028a DT.
- Fix RGMII clock and voltage for a couple of fsl-ls1028a-kontron-sl28
boards.
- Fix RGMII connection to QCA8334 switch for imx6dl-yapp4 board.
* tag 'imx-fixes-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
ARM: dts: imx: emcon-avari: Fix nxp,pca8574 #gpio-cells
ARM: dts: imx7d-pico: Fix the 'tuning-step' property
ARM: dts: imx7d-meerkat96: Fix the 'tuning-step' property
arm64: dts: freescale: sl28: var1: fix RGMII clock and voltage
arm64: dts: freescale: sl28: var4: fix RGMII clock and voltage
ARM: imx: pm-imx27: Include "common.h"
arm64: dts: zii-ultra: fix 12V_MAIN voltage
arm64: dts: zii-ultra: remove second GEN_3V3 regulator instance
arm64: dts: ls1028a: fix memory node
ARM: dts: imx6q-dhcom: Add PU,VDD1P1,VDD2P5 regulators
ARM: dts: imx6dl-yapp4: Fix RGMII connection to QCA8334 switch
Link: https://lore.kernel.org/r/20210527011758.GD8194@dragon
Signed-off-by: Olof Johansson <olof@lixom.net>
This fix the recent removal of clock drivers selection.
While it is not necessary to select the clock drivers themselves, we need
to select a proper implementation of the clock API, which for the meson, is
CCF
Fixes: ba66a25536 ("arm64: meson: ship only the necessary clock controllers")
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20210429083823.59546-1-jbrunet@baylibre.com
* Another state update on exit to userspace fix
* Prevent the creation of mixed 32/64 VMs
* Fix regression with irqbypass not restarting the guest on failed connect
* Fix regression with debug register decoding resulting in overlapping access
* Commit exception state on exit to usrspace
* Fix the MMU notifier return values
* Add missing 'static' qualifiers in the new host stage-2 code
x86 fixes:
* fix guest missed wakeup with assigned devices
* fix WARN reported by syzkaller
* do not use BIT() in UAPI headers
* make the kvm_amd.avic parameter bool
PPC fixes:
* make halt polling heuristics consistent with other architectures
selftests:
* various fixes
* new performance selftest memslot_perf_test
* test UFFD minor faults in demand_paging_test
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Paolo Bonzini:
"ARM fixes:
- Another state update on exit to userspace fix
- Prevent the creation of mixed 32/64 VMs
- Fix regression with irqbypass not restarting the guest on failed
connect
- Fix regression with debug register decoding resulting in
overlapping access
- Commit exception state on exit to usrspace
- Fix the MMU notifier return values
- Add missing 'static' qualifiers in the new host stage-2 code
x86 fixes:
- fix guest missed wakeup with assigned devices
- fix WARN reported by syzkaller
- do not use BIT() in UAPI headers
- make the kvm_amd.avic parameter bool
PPC fixes:
- make halt polling heuristics consistent with other architectures
selftests:
- various fixes
- new performance selftest memslot_perf_test
- test UFFD minor faults in demand_paging_test"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (44 commits)
selftests: kvm: fix overlapping addresses in memslot_perf_test
KVM: X86: Kill off ctxt->ud
KVM: X86: Fix warning caused by stale emulation context
KVM: X86: Use kvm_get_linear_rip() in single-step and #DB/#BP interception
KVM: x86/mmu: Fix comment mentioning skip_4k
KVM: VMX: update vcpu posted-interrupt descriptor when assigning device
KVM: rename KVM_REQ_PENDING_TIMER to KVM_REQ_UNBLOCK
KVM: x86: add start_assignment hook to kvm_x86_ops
KVM: LAPIC: Narrow the timer latency between wait_lapic_expire and world switch
selftests: kvm: do only 1 memslot_perf_test run by default
KVM: X86: Use _BITUL() macro in UAPI headers
KVM: selftests: add shared hugetlbfs backing source type
KVM: selftests: allow using UFFD minor faults for demand paging
KVM: selftests: create alias mappings when using shared memory
KVM: selftests: add shmem backing source type
KVM: selftests: refactor vm_mem_backing_src_type flags
KVM: selftests: allow different backing source types
KVM: selftests: compute correct demand paging size
KVM: selftests: simplify setup_demand_paging error handling
KVM: selftests: Print a message if /dev/kvm is missing
...
- Don't use contiguous or block mappings for the linear map when KFENCE
is enabled.
- Fix link in the arch_counter_enforce_ordering() comment.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
- Don't use contiguous or block mappings for the linear map when KFENCE
is enabled.
- Fix link in the arch_counter_enforce_ordering() comment.
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: mm: don't use CON and BLK mapping if KFENCE is enabled
arm64: Fix stale link in the arch_counter_enforce_ordering() comment
It looks like we have tolerated creating mixed-width VMs since...
forever. However, that was never the intention, and we'd rather
not have to support that pointless complexity.
Forbid such a setup by making sure all the vcpus have the same
register width.
Reported-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20210524170752.1549797-1-maz@kernel.org
Commit 26778aaa13 ("KVM: arm64: Commit pending PC adjustemnts before
returning to userspace") fixed the PC updating issue by forcing an explicit
synchronisation of the exception state on vcpu exit to userspace.
However, we forgot to take into account the case where immediate_exit is
set by userspace and KVM_RUN will exit immediately. Fix it by resolving all
pending PC updates before returning to userspace.
Since __kvm_adjust_pc() relies on a loaded vcpu context, I moved the
immediate_exit checking right after vcpu_load(). We will get some overhead
if immediate_exit is true (which should hopefully be rare).
Fixes: 26778aaa13 ("KVM: arm64: Commit pending PC adjustemnts before returning to userspace")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210526141831.1662-1-yuzenghui@huawei.com
Cc: stable@vger.kernel.org # 5.11
can and wireless trees. Notably including fixes for the recently
announced "FragAttacks" WiFi vulnerabilities. Rather large batch,
touching some core parts of the stack, too, but nothing hair-raising.
Current release - regressions:
- tipc: make node link identity publish thread safe
- dsa: felix: re-enable TAS guard band mode
- stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()
- stmmac: fix system hang if change mac address after interface ifdown
Current release - new code bugs:
- mptcp: avoid OOB access in setsockopt()
- bpf: Fix nested bpf_bprintf_prepare with more per-cpu buffers
- ethtool: stats: fix a copy-paste error - init correct array size
Previous releases - regressions:
- sched: fix packet stuck problem for lockless qdisc
- net: really orphan skbs tied to closing sk
- mlx4: fix EEPROM dump support
- bpf: fix alu32 const subreg bound tracking on bitwise operations
- bpf: fix mask direction swap upon off reg sign change
- bpf, offload: reorder offload callback 'prepare' in verifier
- stmmac: Fix MAC WoL not working if PHY does not support WoL
- packetmmap: fix only tx timestamp on request
- tipc: skb_linearize the head skb when reassembling msgs
Previous releases - always broken:
- mac80211: address recent "FragAttacks" vulnerabilities
- mac80211: do not accept/forward invalid EAPOL frames
- mptcp: avoid potential error message floods
- bpf, ringbuf: deny reserve of buffers larger than ringbuf to prevent
out of buffer writes
- bpf: forbid trampoline attach for functions with variable arguments
- bpf: add deny list of functions to prevent inf recursion of tracing
programs
- tls splice: check SPLICE_F_NONBLOCK instead of MSG_DONTWAIT
- can: isotp: prevent race between isotp_bind() and isotp_setsockopt()
- netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check,
fallback to non-AVX2 version
Misc:
- bpf: add kconfig knob for disabling unpriv bpf by default
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Merge tag 'net-5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Jakub Kicinski:
"Networking fixes for 5.13-rc4, including fixes from bpf, netfilter,
can and wireless trees. Notably including fixes for the recently
announced "FragAttacks" WiFi vulnerabilities. Rather large batch,
touching some core parts of the stack, too, but nothing hair-raising.
Current release - regressions:
- tipc: make node link identity publish thread safe
- dsa: felix: re-enable TAS guard band mode
- stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()
- stmmac: fix system hang if change mac address after interface
ifdown
Current release - new code bugs:
- mptcp: avoid OOB access in setsockopt()
- bpf: Fix nested bpf_bprintf_prepare with more per-cpu buffers
- ethtool: stats: fix a copy-paste error - init correct array size
Previous releases - regressions:
- sched: fix packet stuck problem for lockless qdisc
- net: really orphan skbs tied to closing sk
- mlx4: fix EEPROM dump support
- bpf: fix alu32 const subreg bound tracking on bitwise operations
- bpf: fix mask direction swap upon off reg sign change
- bpf, offload: reorder offload callback 'prepare' in verifier
- stmmac: Fix MAC WoL not working if PHY does not support WoL
- packetmmap: fix only tx timestamp on request
- tipc: skb_linearize the head skb when reassembling msgs
Previous releases - always broken:
- mac80211: address recent "FragAttacks" vulnerabilities
- mac80211: do not accept/forward invalid EAPOL frames
- mptcp: avoid potential error message floods
- bpf, ringbuf: deny reserve of buffers larger than ringbuf to
prevent out of buffer writes
- bpf: forbid trampoline attach for functions with variable arguments
- bpf: add deny list of functions to prevent inf recursion of tracing
programs
- tls splice: check SPLICE_F_NONBLOCK instead of MSG_DONTWAIT
- can: isotp: prevent race between isotp_bind() and
isotp_setsockopt()
- netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check,
fallback to non-AVX2 version
Misc:
- bpf: add kconfig knob for disabling unpriv bpf by default"
* tag 'net-5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (172 commits)
net: phy: Document phydev::dev_flags bits allocation
mptcp: validate 'id' when stopping the ADD_ADDR retransmit timer
mptcp: avoid error message on infinite mapping
mptcp: drop unconditional pr_warn on bad opt
mptcp: avoid OOB access in setsockopt()
nfp: update maintainer and mailing list addresses
net: mvpp2: add buffer header handling in RX
bnx2x: Fix missing error code in bnx2x_iov_init_one()
net: zero-initialize tc skb extension on allocation
net: hns: Fix kernel-doc
sctp: fix the proc_handler for sysctl encap_port
sctp: add the missing setting for asoc encap_port
bpf, selftests: Adjust few selftest result_unpriv outcomes
bpf: No need to simulate speculative domain for immediates
bpf: Fix mask direction swap upon off reg sign change
bpf: Wrap aux data inside bpf_sanitize_info container
bpf: Fix BPF_LSM kconfig symbol dependency
selftests/bpf: Add test for l3 use of bpf_redirect_peer
bpftool: Add sock_release help info for cgroup attach/prog load command
net: dsa: microchip: enable phy errata workaround on 9567
...
During hardware validation it was noticed that the clock isn't
continuously enabled when there is no link. This is because the 125MHz
clock is derived from the internal PLL which seems to go into some kind
of power-down mode every once in a while. The LS1028A expects a contiuous
clock. Thus enable the PLL all the time.
Also, the RGMII pad voltage is wrong, it was configured to 2.5V (that is
the VDDH regulator). The correct voltage is 1.8V, i.e. the VDDIO
regulator.
This fix is for the freescale/fsl-ls1028a-kontron-sl28-var1.dts.
Fixes: 642856097c ("arm64: dts: freescale: sl28: add variant 1")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
During hardware validation it was noticed that the clock isn't
continuously enabled when there is no link. This is because the 125MHz
clock is derived from the internal PLL which seems to go into some kind
of power-down mode every once in a while. The LS1028A expects a contiuous
clock. Thus enable the PLL all the time.
Also, the RGMII pad voltage is wrong. It was configured to 2.5V (that is
the VDDH regulator). The correct voltage is 1.8V, i.e. the VDDIO
regulator.
This fix is for the freescale/fsl-ls1028a-kontron-sl28-var4.dts.
Fixes: 815364d042 ("arm64: dts: freescale: add Kontron sl28 support")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
As this is a fixed regulator on the board there was no harm in the wrong
voltage being specified, apart from a confusing reporting to userspace.
Fixes: 4a13b3bec3 ("arm64: dts: imx: add Zii Ultra board support")
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
When adding the sound support a second instance of the GEN_3V3 regulator was
added by accident. Remove it and point the consumers to the first instance.
Fixes: 663a5b5efa ("arm64: dts: zii-ultra: add sound support")
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
While enabling EDAC support for the LS1028A it was discovered that the
memory node has a wrong endianness setting as well as a wrong interrupt
assignment. Fix both.
This was tested on a sl28 board. To force ECC errors, you can use the
error injection supported by the controller in hardware (with
CONFIG_EDAC_DEBUG enabled):
# enable error injection
$ echo 0x100 > /sys/devices/system/edac/mc/mc0/inject_ctrl
# flip lowest bit of the data
$ echo 0x1 > /sys/devices/system/edac/mc/mc0/inject_data_lo
Fixes: 8897f3255c ("arm64: dts: Add support for NXP LS1028A SoC")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Only a small number of fixes so far, including some that I had applied
during the merge window, so this is based on the original merge of the
other branches.
- The largest change is a fix for a reference counting bug in
the AMD TEE driver.
- Neil Armstrong now co-maintains Amlogic SoC support
- Two build warning fixes for renesas device tree files
- A sign expansion bug for optee
- A DT binding fix for a mismerge
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Merge tag 'arm-soc-fixes-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC fixes from Arnd Bergmann:
"Only a small number of fixes so far, including some that I had applied
during the merge window, so this is based on the original merge of the
other branches.
- The largest change is a fix for a reference counting bug in the AMD
TEE driver.
- Neil Armstrong now co-maintains Amlogic SoC support
- Two build warning fixes for renesas device tree files
- A sign expansion bug for optee
- A DT binding fix for a mismerge"
* tag 'arm-soc-fixes-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
ARM: npcm: wpcm450: select interrupt controller driver
MAINTAINERS: ARM/Amlogic SoCs: add Neil as primary maintainer
tee: amdtee: unload TA only when its refcount becomes 0
dt-bindings: nvmem: mediatek: remove duplicate mt8192 line
firmware: arm_scmi: Remove duplicate declaration of struct scmi_protocol_handle
firmware: arm_scpi: Prevent the ternary sign expansion bug
arm64: dts: renesas: Add port@0 node for all CSI-2 nodes to dtsi
arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Fix CSI40 ports
Randy reported a randconfig build error recently on i386:
ld: arch/x86/net/bpf_jit_comp32.o: in function `do_jit':
bpf_jit_comp32.c:(.text+0x28c9): undefined reference to `__bpf_call_base'
ld: arch/x86/net/bpf_jit_comp32.o: in function `bpf_int_jit_compile':
bpf_jit_comp32.c:(.text+0x3694): undefined reference to `bpf_jit_blind_constants'
ld: bpf_jit_comp32.c:(.text+0x3719): undefined reference to `bpf_jit_binary_free'
ld: bpf_jit_comp32.c:(.text+0x3745): undefined reference to `bpf_jit_binary_alloc'
ld: bpf_jit_comp32.c:(.text+0x37d3): undefined reference to `bpf_jit_prog_release_other'
[...]
The cause was that b24abcff91 ("bpf, kconfig: Add consolidated menu entry for
bpf with core options") moved BPF_JIT from net/Kconfig into kernel/bpf/Kconfig
and previously BPF_JIT was guarded by a 'if NET'. However, there is no actual
dependency on NET, it's just that menuconfig NET selects BPF. And the latter in
turn causes kernel/bpf/core.o to be built which contains above symbols. Randy's
randconfig didn't have NET set, and BPF wasn't either, but BPF_JIT otoh was.
Detangle this by making BPF_JIT depend on BPF instead. arm64 was the only arch
that pulled in its JIT in net/ via obj-$(CONFIG_NET), all others unconditionally
pull this dir in via obj-y. Do the same since CONFIG_NET guard there is really
useless as we compiled the JIT via obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o anyway.
Fixes: b24abcff91 ("bpf, kconfig: Add consolidated menu entry for bpf with core options")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
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Merge tag 'quota_for_v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull quota fixes from Jan Kara:
"The most important part in the pull is disablement of the new syscall
quotactl_path() which was added in rc1.
The reason is some people at LWN discussion pointed out dirfd would be
useful for this path based syscall and Christian Brauner agreed.
Without dirfd it may be indeed problematic for containers. So let's
just disable the syscall for now when it doesn't have users yet so
that we have more time to mull over how to best specify the filesystem
we want to work on"
* tag 'quota_for_v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
quota: Disable quotactl_path syscall
quota: Use 'hlist_for_each_entry' to simplify code
With infradead.org archives gone, update the link to lore.kernel.org as
these links are deemed stable.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In commit fa8b90070a ("quota: wire up quotactl_path") we have wired up
new quotactl_path syscall. However some people in LWN discussion have
objected that the path based syscall is missing dirfd and flags argument
which is mostly standard for contemporary path based syscalls. Indeed
they have a point and after a discussion with Christian Brauner and
Sascha Hauer I've decided to disable the syscall for now and update its
API. Since there is no userspace currently using that syscall and it
hasn't been released in any major release, we should be fine.
CC: Christian Brauner <christian.brauner@ubuntu.com>
CC: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/lkml/20210512153621.n5u43jsytbik4yze@wittgenstein
Signed-off-by: Jan Kara <jack@suse.cz>
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Merge tag 'for-linus-5.13b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
- two patches for error path fixes
- a small series for fixing a regression with swiotlb with Xen on Arm
* tag 'for-linus-5.13b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/swiotlb: check if the swiotlb has already been initialized
arm64: do not set SWIOTLB_NO_FORCE when swiotlb is required
xen/arm: move xen_swiotlb_detect to arm/swiotlb-xen.h
xen/unpopulated-alloc: fix error return code in fill_list()
xen/gntdev: fix gntdev_mmap() error exit path
Commit 03fdfb2690 ("KVM: arm64: Don't write junk to sysregs on
reset") flipped the register number to 0 for all the debug registers
in the sysreg table, hereby indicating that these registers live
in a separate shadow structure.
However, the author of this patch failed to realise that all the
accessors are using that particular index instead of the register
encoding, resulting in all the registers hitting index 0. Not quite
a valid implementation of the architecture...
Address the issue by fixing all the accessors to use the CRm field
of the encoding, which contains the debug register index.
Fixes: 03fdfb2690 ("KVM: arm64: Don't write junk to sysregs on reset")
Reported-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
KVM currently updates PC (and the corresponding exception state)
using a two phase approach: first by setting a set of flags,
then by converting these flags into a state update when the vcpu
is about to enter the guest.
However, this creates a disconnect with userspace if the vcpu thread
returns there with any exception/PC flag set. In this case, the exposed
context is wrong, as userspace doesn't have access to these flags
(they aren't architectural). It also means that these flags are
preserved across a reset, which isn't expected.
To solve this problem, force an explicit synchronisation of the
exception state on vcpu exit to userspace. As an optimisation
for nVHE systems, only perform this when there is something pending.
Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Tested-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org # 5.11
In order to make it easy to call __adjust_pc() from the EL1 code
(in the case of nVHE), rename it to __kvm_adjust_pc() and move
it out of line.
No expected functional change.
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Tested-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org # 5.11
The host stage-2 memory pools are not used outside of mem_protect.c,
mark them static.
Fixes: 1025c8c0c6 ("KVM: arm64: Wrap the host with a stage 2")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210514085640.3917886-3-qperret@google.com
It is not used outside of setup.c, mark it static.
Fixes:f320bc742bc2 ("KVM: arm64: Prepare the creation of s1 mappings at EL2")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210514085640.3917886-2-qperret@google.com
arch/arm64/kvm/mmu.c:1114:9-10: WARNING: return of 0/1 in function 'kvm_age_gfn' with return type bool
arch/arm64/kvm/mmu.c:1084:9-10: WARNING: return of 0/1 in function 'kvm_set_spte_gfn' with return type bool
arch/arm64/kvm/mmu.c:1127:9-10: WARNING: return of 0/1 in function 'kvm_test_age_gfn' with return type bool
arch/arm64/kvm/mmu.c:1070:9-10: WARNING: return of 0/1 in function 'kvm_unmap_gfn_range' with return type bool
Return statements in functions returning bool should use
true/false instead of 1/0.
Generated by: scripts/coccinelle/misc/boolreturn.cocci
Fixes: cd4c718352 ("KVM: arm64: Convert to the gfn-based MMU notifier callbacks")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210426223357.GA45871@cd4295a34ed8
Interrupt routers are memory mapped peripherals, that are organized
in our dts bus hierarchy to closely represents the actual hardware
behavior.
However, without explicitly calling out the reg property, using
2021.03+ dt-schema package, this exposes the following problem with
dtbs_check:
/arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml: bus@100000:
interrupt-controller0: {'type': 'object'} is not allowed for
{'compatible': ['ti,sci-intr'], .....
Even though we don't use interrupt router directly via memory mapped
registers and have to use it via the system controller, the hardware
block is memory mapped, so describe the base address in device tree.
This is a valid, comprehensive description of hardware and permitted
by the existing ti,sci-intr schema.
Reviewed-by: Tero Kristo <kristo@kernel.org>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210511194821.13919-1-nm@ti.com
Instead of using empty ranges property, lets map explicitly the address
range that is mapped onto the dma / navigator subsystems (navss/dmss).
This is also exposed via the dtbs_check with dt-schema newer than
2021.03 version by throwing out following:
arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml: bus@100000: main-navss:
{'type': 'object'} is not allowed for
{'compatible': ['simple-mfd'], '#address-cells': [[2]], .....
This has already been correctly done for J7200, however was missed for
other k3 SoCs. Fix that oversight.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20210510145429.8752-1-nm@ti.com
Lets rename the node name of TI-SCI node to be system-controller as it
is a better standardized name for the function that TI-SCI plays in the
SoC.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Link: https://lore.kernel.org/r/20210510145033.7426-5-nm@ti.com
The DMSC node does'nt require any of "#address-cells", "#size-cells"
or "ranges" property as the child nodes are representations of SoC's
system controller itself, so align it with the bindings.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Link: https://lore.kernel.org/r/20210510145033.7426-4-nm@ti.com
We currently use clocks as the node name for the node representing
TI-SCI clock nodes. This is better renamed to being clock-controller
as that is a better representative of the system controller function
as a clock controller for the SoC.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Link: https://lore.kernel.org/r/20210510145033.7426-2-nm@ti.com
Traffic through main NAVSS interconnect is coherent wrt ARM caches on
J7200 SoC. Add missing dma-coherent property to main_navss node.
Also add dma-ranges to be consistent with mcu_navss node
and with AM65/J721e main_navss and mcu_navss nodes.
Fixes: d361ed8845 ("arm64: dts: ti: Add support for J7200 SoC")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210510180601.19458-1-vigneshr@ti.com
AM654 EVM boards are not shipped with OV5640 sensor module, it is a
separate purchase. OV5640 module is also just one of the possible
sensors or capture boards you can connect.
However, for some reason, OV5640 has been added to the board dts file,
making it cumbersome to use other sensors.
Remove the OV5640 from the dts file so that it is easy to use other
sensors via DT overlays.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210423083120.73476-1-tomi.valkeinen@ideasonboard.com
To ensure that instructions are observable in a new mapping, the arm64
set_pte_at() implementation cleans the D-cache and invalidates the
I-cache to the PoU. As an optimisation, this is only done on executable
mappings and the PG_dcache_clean page flag is set to avoid future cache
maintenance on the same page.
When two different processes map the same page (e.g. private executable
file or shared mapping) there's a potential race on checking and setting
PG_dcache_clean via set_pte_at() -> __sync_icache_dcache(). While on the
fault paths the page is locked (PG_locked), mprotect() does not take the
page lock. The result is that one process may see the PG_dcache_clean
flag set but the I/D cache maintenance not yet performed.
Avoid test_and_set_bit(PG_dcache_clean) in favour of separate test_bit()
and set_bit(). In the rare event of a race, the cache maintenance is
done twice.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210514095001.13236-1-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Although SWIOTLB_NO_FORCE is meant to allow later calls to swiotlb_init,
today dma_direct_map_page returns error if SWIOTLB_NO_FORCE.
For now, without a larger overhaul of SWIOTLB_NO_FORCE, the best we can
do is to avoid setting SWIOTLB_NO_FORCE in mem_init when we know that it
is going to be required later (e.g. Xen requires it).
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: catalin.marinas@arm.com
CC: will@kernel.org
CC: linux-arm-kernel@lists.infradead.org
Fixes: 2726bf3ff2 ("swiotlb: Make SWIOTLB_NO_FORCE perform no allocation")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210512201823.1963-2-sstabellini@kernel.org
Signed-off-by: Juergen Gross <jgross@suse.com>
A valid implementation choice for the ChooseRandomNonExcludedTag()
pseudocode function used by IRG is to behave in the same way as with
GCR_EL1.RRND=0. This would mean that RGSR_EL1.SEED is used as an LFSR
which must have a non-zero value in order for IRG to properly produce
pseudorandom numbers. However, RGSR_EL1 is reset to an UNKNOWN value
on soft reset and thus may reset to 0. Therefore we must initialize
RGSR_EL1.SEED to a non-zero value in order to ensure that IRG behaves
as expected.
Signed-off-by: Peter Collingbourne <pcc@google.com>
Fixes: 3b714d24ef ("arm64: mte: CPU feature detection and initial sysreg configuration")
Cc: <stable@vger.kernel.org> # 5.10
Link: https://linux-review.googlesource.com/id/I2b089b6c7d6f17ee37e2f0db7df5ad5bcc04526c
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20210507185905.1745402-1-pcc@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The arm64 code allocates an internal constant to every CPU feature it can
detect, distinct from the public hwcap numbers we use to expose some
features to userspace. Currently this is maintained manually which is an
irritating source of conflicts when working on new features, to avoid this
replace the header with a simple text file listing the names we've assigned
and sort it to minimise conflicts.
As part of doing this we also do the Kbuild hookup required to hook up
an arch tools directory and to generate header files in there.
This will result in a renumbering and reordering of the existing constants,
since they are all internal only the values should not be important. The
reordering will impact the order in which some steps in enumeration handle
features but the algorithm is not intended to depend on this and I haven't
seen any issues when testing. Due to the UAO cpucap having been removed in
the past we end up with ARM64_NCAPS being 1 smaller than it was before.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20210428121231.11219-1-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
- Restore terminal stack frame records. Their previous removal caused
traces which cross secondary_start_kernel to terminate one entry too
late, with a spurious "0" entry.
- Fix boot warning with pseudo-NMI due to the way we manipulate the PMR
register.
- ACPI fixes: avoid corruption of interrupt mappings on watchdog probe
failure (GTDT), prevent unregistering of GIC SGIs.
- Force SPARSEMEM_VMEMMAP as the only memory model, it saves with having
to test all the other combinations.
- Documentation fixes and updates: tagged address ABI exceptions on
brk/mmap/mremap(), event stream frequency, update booting requirements
on the configuration of traps.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull more arm64 updates from Catalin Marinas:
"A mix of fixes and clean-ups that turned up too late for the first
pull request:
- Restore terminal stack frame records. Their previous removal caused
traces which cross secondary_start_kernel to terminate one entry
too late, with a spurious "0" entry.
- Fix boot warning with pseudo-NMI due to the way we manipulate the
PMR register.
- ACPI fixes: avoid corruption of interrupt mappings on watchdog
probe failure (GTDT), prevent unregistering of GIC SGIs.
- Force SPARSEMEM_VMEMMAP as the only memory model, it saves with
having to test all the other combinations.
- Documentation fixes and updates: tagged address ABI exceptions on
brk/mmap/mremap(), event stream frequency, update booting
requirements on the configuration of traps"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: kernel: Update the stale comment
arm64: Fix the documented event stream frequency
arm64: entry: always set GIC_PRIO_PSR_I_SET during entry
arm64: Explicitly document boot requirements for SVE
arm64: Explicitly require that FPSIMD instructions do not trap
arm64: Relax booting requirements for configuration of traps
arm64: cpufeatures: use min and max
arm64: stacktrace: restore terminal records
arm64/vdso: Discard .note.gnu.property sections in vDSO
arm64: doc: Add brk/mmap/mremap() to the Tagged Address ABI Exceptions
psci: Remove unneeded semicolon
ACPI: irq: Prevent unregistering of GIC SGIs
ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
arm64: Show three registers per line
arm64: remove HAVE_DEBUG_BUGVERBOSE
arm64: alternative: simplify passing alt_region
arm64: Force SPARSEMEM_VMEMMAP as the only memory management model
arm64: vdso32: drop -no-integrated-as flag
Commit af391b15f7 ("arm64: kernel: rename __cpu_suspend to keep it aligned with arm")
has used @index instead of @arg, but the comment is stale, update it.
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/1620280462-21937-1-git-send-email-zhangshaokun@hisilicon.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Merge more updates from Andrew Morton:
"The remainder of the main mm/ queue.
143 patches.
Subsystems affected by this patch series (all mm): pagecache, hugetlb,
userfaultfd, vmscan, compaction, migration, cma, ksm, vmstat, mmap,
kconfig, util, memory-hotplug, zswap, zsmalloc, highmem, cleanups, and
kfence"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (143 commits)
kfence: use power-efficient work queue to run delayed work
kfence: maximize allocation wait timeout duration
kfence: await for allocation using wait_event
kfence: zero guard page after out-of-bounds access
mm/process_vm_access.c: remove duplicate include
mm/mempool: minor coding style tweaks
mm/highmem.c: fix coding style issue
btrfs: use memzero_page() instead of open coded kmap pattern
iov_iter: lift memzero_page() to highmem.h
mm/zsmalloc: use BUG_ON instead of if condition followed by BUG.
mm/zswap.c: switch from strlcpy to strscpy
arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
mm,memory_hotplug: add kernel boot option to enable memmap_on_memory
acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported
mm,memory_hotplug: allocate memmap from the added memory range
mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count()
mm,memory_hotplug: relax fully spanned sections check
drivers/base/memory: introduce memory_block_{online,offline}
mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove
...
This set of changes adds support for the PWM controller found on Toshiba
Visconti SoCs and converts a couple of drivers to the atomic API.
There's also a bunch of cleanups and minor fixes across the board.
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Merge tag 'pwm/for-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
Pull pwm updates from Thierry Reding:
"This adds support for the PWM controller found on Toshiba Visconti
SoCs and converts a couple of drivers to the atomic API.
There's also a bunch of cleanups and minor fixes across the board"
* tag 'pwm/for-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (35 commits)
pwm: Reword docs about pwm_apply_state()
pwm: atmel: Improve duty cycle calculation in .apply()
pwm: atmel: Fix duty cycle calculation in .get_state()
pwm: visconti: Add Toshiba Visconti SoC PWM support
dt-bindings: pwm: Add bindings for Toshiba Visconti PWM Controller
arm64: dts: rockchip: Remove clock-names from PWM nodes
ARM: dts: rockchip: Remove clock-names from PWM nodes
dt-bindings: pwm: rockchip: Add more compatible strings
dt-bindings: pwm: Convert pwm-rockchip.txt to YAML
pwm: mediatek: Remove unused function
pwm: pca9685: Improve runtime PM behavior
pwm: pca9685: Support hardware readout
pwm: pca9685: Switch to atomic API
pwm: lpss: Don't modify HW state in .remove callback
pwm: sti: Free resources only after pwmchip_remove()
pwm: sti: Don't modify HW state in .remove callback
pwm: lpc3200: Don't modify HW state in .remove callback
pwm: lpc18xx-sct: Free resources only after pwmchip_remove()
pwm: bcm-kona: Don't modify HW state in .remove callback
pwm: bcm2835: Free resources only after pwmchip_remove()
...
Enable arm64 platform to use the MHP_MEMMAP_ON_MEMORY feature.
Link: https://lkml.kernel.org/r/20210421102701.25051-9-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
SYS_SUPPORTS_HUGETLBFS config has duplicate definitions on platforms
that subscribe it. Instead, just make it a generic option which can be
selected on applicable platforms.
Also rename it as ARCH_SUPPORTS_HUGETLBFS instead. This reduces code
duplication and makes it cleaner.
Link: https://lkml.kernel.org/r/1617259448-22529-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64]
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com> [riscv]
Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc]
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds