1. Add support for Exynos5433 to Power Management Unit (PMU) and Power
Domains drivers.
2. Cleanups of duplicated and unused defines.
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Merge tag 'samsung-drivers-soc-pmu-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux into next/drivers
Continuation of improvements for Exynos PM drivers for v4.11:
1. Add support for Exynos5433 to Power Management Unit (PMU) and Power
Domains drivers.
2. Cleanups of duplicated and unused defines.
* tag 'samsung-drivers-soc-pmu-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux:
soc: samsung: pmu: Remove duplicated define for ARM_L2_OPTION register
soc: samsung: pmu: Remove unused and duplicated defines
soc: samsung: pm_domains: Add new Exynos5433 compatible
soc: samsung: pmu: Add dummy support for Exynos5433 SoC
Signed-off-by: Olof Johansson <olof@lixom.net>
- It includes a series which adds DT bindings and PM domain driver for
PCU (Power Control Unit) block found on ZTE ZX2967 family SoC.
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Merge tag 'zte-pd-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into next/drivers
ZTE PM domain driver support for 4.11:
- It includes a series which adds DT bindings and PM domain driver for
PCU (Power Control Unit) block found on ZTE ZX2967 family SoC.
* tag 'zte-pd-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
soc: zte: pm_domains: Add support for zx296718
soc: zte: pm_domains: Prepare for supporting ARMv8 zx2967 family
soc: zte: Add header for PM domains specifiers
MAINTAINERS: add zx2967 SoC drivers to ARM ZTE architecture
dt-bindings: zte: add bindings document for zx2967 power domain controller
Signed-off-by: Olof Johansson <olof@lixom.net>
- more EBI fixes
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Merge tag 'at91-ab-4.11-drivers2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux into next/drivers
Drivers for 4.11 #2:
- more EBI fixes
* tag 'at91-ab-4.11-drivers2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
memory: atmel-ebi: Enable the SMC clock if specified
memory: atmel-ebi: Properly handle multiple reference to the same CS
memory: atmel-ebi: Fix the test to enable generic SMC logic
Signed-off-by: Olof Johansson <olof@lixom.net>
This contains a single commit that plugs a potential device node leak in
error handling code.
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Merge tag 'tegra-for-4.11-memory' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/drivers
memory: tegra: Changes for v4.11-rc1
This contains a single commit that plugs a potential device node leak in
error handling code.
* tag 'tegra-for-4.11-memory' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
memory: tegra: Add a missing 'of_node_put()' call
Signed-off-by: Olof Johansson <olof@lixom.net>
We don't currently have anything else for drivers/soc to
merge, but I'd expect that to change as soon as we can start
moving PM code into drivers with the recently posted SRAM
changes. Anyways, sent as a separate pull request to make
it easy to group the ARM SoC pull requests.
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Merge tag 'omap-for-v4.11/drivers-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/drivers
Just a single wkup_m3_ipc clean-up for v4.11 merge window.
We don't currently have anything else for drivers/soc to
merge, but I'd expect that to change as soon as we can start
moving PM code into drivers with the recently posted SRAM
changes. Anyways, sent as a separate pull request to make
it easy to group the ARM SoC pull requests.
* tag 'omap-for-v4.11/drivers-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
soc: ti: wkup_m3_ipc: Drop wait from wkup_m3_rproc_boot_thread
Signed-off-by: Olof Johansson <olof@lixom.net>
* Fix issues with SCM compile testing
* Add SCM set remote state API
* Mask APQ8064 SCM clock dependency issue
* Add Qualcomm DMA folder to MAINTAINERS
* Fix EBI2 dependencies
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Merge tag 'qcom-drivers-for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/agross/linux into next/drivers
Qualcomm ARM Based Driver Updates for v4.11
* Fix issues with SCM compile testing
* Add SCM set remote state API
* Mask APQ8064 SCM clock dependency issue
* Add Qualcomm DMA folder to MAINTAINERS
* Fix EBI2 dependencies
* tag 'qcom-drivers-for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/agross/linux:
firmware: qcom_scm: Add set remote state API
MAINTAINERS: Update the files to include the Qualcomm DMA folder
bus: qcom_ebi2: default y if ARCH_QCOM
firmware: qcom: scm: Mask APQ8064 core clk dependency
firmware: qcom: scm: Add empty functions to help compile testing
Signed-off-by: Olof Johansson <olof@lixom.net>
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Merge tag 'keystone_soc_for_4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone into next/drivers
Couple of minor cleanups for Navigator drivers for 4.11
* tag 'keystone_soc_for_4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone:
soc: ti: knav: cleanup includes and sort header files
soc: ti: knav_dma: fix typos in trace message
Signed-off-by: Olof Johansson <olof@lixom.net>
hiword registers (write-mask in upper 16bit) and domain-definitions
for the rk3328 soc.
Secondly a "driver" that attaches to the already existing grf nodes
and is able to set static defaults for settings that cannot really
be attached to any specific subsystem.
Most GRF settings can already be set from drivers using them, but there
are some behavioural settings like the mmc/jtag switch that cannot.
As the commit message states this is really meant as a last line
of defence for things that neither belong to a subsystem nor to the
Having this here allows arm64 socs to have this as well and also
moves another bit of code out of the arm32 mach-rockchip.
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Merge tag 'v4.11-armsoc-drivers1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip into next/drivers
Some extensions to the power-domain driver to support domains in
hiword registers (write-mask in upper 16bit) and domain-definitions
for the rk3328 soc.
Secondly a "driver" that attaches to the already existing grf nodes
and is able to set static defaults for settings that cannot really
be attached to any specific subsystem.
Most GRF settings can already be set from drivers using them, but there
are some behavioural settings like the mmc/jtag switch that cannot.
As the commit message states this is really meant as a last line
of defence for things that neither belong to a subsystem nor to the
Having this here allows arm64 socs to have this as well and also
moves another bit of code out of the arm32 mach-rockchip.
* tag 'v4.11-armsoc-drivers1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
ARM: rockchip: drop rk3288 jtag/mmc switch handling
soc: rockchip: add driver handling grf setup
dt-bindings: add used but undocumented rockchip grf compatible values
soc: rockchip: power-domain: add power domain support for rk3328
dt-bindings: add binding for rk3328 power domains
dt-bindings: power: add RK3328 SoCs header for idle-request
soc: rockchip: power-domain: Support domain control in hiword-registers
Signed-off-by: Olof Johansson <olof@lixom.net>
Beside basic function of setting proper configuration for low power modes, the
Exynos PMU (Power Management Unit) driver is also a provider of syscon regmap
for its registers. This regmap is essential to many other drivers wanting to
or needing to implement low power mode.
Exynos pinctrl driver, before getting support for Runtime Power Management,
needs access to this syscon regmap. Let's do it in a DT ABI friendly way.
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Merge tag 'samsung-drivers-soc-pmu-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux into next/drivers
Improvements for Exynos PMU driver for v4.11:
Beside basic function of setting proper configuration for low power modes, the
Exynos PMU (Power Management Unit) driver is also a provider of syscon regmap
for its registers. This regmap is essential to many other drivers wanting to
or needing to implement low power mode.
Exynos pinctrl driver, before getting support for Runtime Power Management,
needs access to this syscon regmap. Let's do it in a DT ABI friendly way.
* tag 'samsung-drivers-soc-pmu-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux:
soc: samsung: pmu: Remove messages for failed memory allocation
soc: samsung: pmu: Use of_device_get_match_data helper
soc: samsung: pmu: Provide global function to get PMU regmap
Signed-off-by: Olof Johansson <olof@lixom.net>
The register ARM_L2_OPTION (0x2608 in Exynos4 and Exynos5 PMU) was
defined twice. Both names were used in the Exynos542x code. Simplify
this.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Newer versions of the SMC block requires the SMC clock to be enabled
before the SMC logic can be used.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The exynos-regs-pmu.h was never a complete list of PMU registers. It
contained a lot of holes for registers which were not used. However, a
lot of unused defines came along with porting the code from vendor
kernel. Few of defines were also duplicated.
Remove them so the file will be slightly smaller.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Some devices are defining several sub-ranges within the same CS iomem
range. In this case, we should not duplicate the EBI device config.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
We should test the apply value and not the ret one here.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: 6a4ec4cd08 ("memory: add Atmel EBI (External Bus Interface) driver")
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Add a new compatible string for Exynos5433 because it uses the 0xf
value instead of 0x7 for domain on/off registers.
Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Add compatible for Exynos5433 SoC, so the driver will bind and let other
drivers to use PMU regmap.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
If 'of_find_device_by_node()' fails, an 'of_node_put()' call is missing in
the error handling path.
Fix it by reordering the code.
While at it, remove some empty lines in a more or less similar construction
a few lines below.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Memory subsystem already prints message about failed memory
allocation, there is no need to do it in the driver.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Replace custom code with generic helper to retrieve driver data.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
PMU is something like a SoC wide service, so add a helper function to get
PMU regmap. This will be used by other Exynos device drivers. This way it
can be avoided to model this dependency in device tree (as phandles to PMU
node) for almost every device in the SoC.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
The *_get_optional_* functions weren't really optional so this patch
makes them really optional.
These *_get_optional_* functions will now return NULL instead of an error
if no matching reset phandle is found in the DT, and all the
reset_control_* functions now accept NULL rstc pointers.
Signed-off-by: Ramiro Oliveira <Ramiro.Oliveira@synopsys.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Since the new parameter being added is going to be a bool this patch
changes the shared flag from int to bool to match the new parameter.
Signed-off-by: Ramiro Oliveira <Ramiro.Oliveira@synopsys.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
The LD11 SoC is equipped with not only MIO-reset but also SD-reset
for controlling RST_n pin of the eMMC device.
Update the binding document and remove unneeded "." from each line
in itemization.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Add the zx2967 reset controller driver as maintained by ARM ZTE
architecture maintainers, as they're parts of the core IP.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This patch adds a set remote state SCM API. This will be used by the
Venus and GPU subsystems to set state on the remote processors.
This work was based on two patch sets by Jordan Crouse and Stanimir
Varbanov.
Signed-off-by: Andy Gross <andy.gross@linaro.org>
Recently all qcom dma drivers were moved a separate directory. Update
the files to include the same
Signed-off-by: Pramod Gurav <pramod.gurav@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
Since we want this external bus to be available on multi_v7 builds,
set to default ARCH_QCOM so we get it selected whenever QCOM is
enabled.
Suggested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This patch masks the core clk requirement for the APQ8064. Until the
other peripherals correctly describe their clock dependencies or the
bus driver is put in place to handle the RPM dependencies, this bit
will remain masked.
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This will help to compile testing drivers which depends on scm
functions with COMPILE_TEST Kconfig option.
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
Fix couple of typos in the example given in the TI syscon reset
binding. The ti,reset-bits used for DSP0 are corrected to match
the values that will be used in the actual DT node.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Declare reset_control_ops structures as const as they are only stored
in the ops field of a reset_controller_dev structure. This field is of
type const struct reset_control_ops *, so reset_control_ops structures
having this property can be declared as const.
Done using Coccinelle:
@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct reset_control_ops i@p={...};
@ok1@
identifier r1.i;
position p;
struct ti_syscon_reset_data data;
@@
data.rcdev.ops=&i@p;
@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p
@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct reset_control_ops i;
File size before: drivers/reset/reset-ti-syscon.o
text data bss dec hex filename
1329 240 0 1569 621 drivers/reset/reset-ti-syscon.o
File size after: drivers/reset/reset-ti-syscon.o
text data bss dec hex filename
1377 192 0 1569 621 drivers/reset/reset-ti-syscon.o
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This patch introduces the power domain driver of zx296718
which belongs to zte's zx2967 family.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Reviewed-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
The ARMv8 zx2967 family (296718, 296716 etc) uses different value
for controlling the power domain on/off registers, Choose the
value depending on the compatible.
Multiple domains are prepared for the family, this patch prepares
the common functions.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This patch adds header with values used for ZTE 2967
SoC's power domain driver.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Add the ZTE SoC drivers as maintained by ARM ZTE
architecture maintainers, as they're parts of the core IP.
By the way, this patch adds the maintainer for ARM
ZTE architecture to Baoyou Xie.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This patch adds device tree bindings document for ZTE zx2967
family power domain controller.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
at91sam9_ebi_get_config() is incorrectly converting timings in clock
cycles into timings in nanoseconds by multiplying the cycle values by
the clk rate instead of the clk period.
at91sam9_ebi_xslate_config() has the same problem for the
tdf_ns -> tdf_cycles conversion.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: Chris Leahy <leahycm@gmail.com>
Fixes: 6a4ec4cd08 ("memory: add Atmel EBI (External Bus Interface) driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
If STATUS_SET was not set, ti_syscon_reset_status would always return 0
no matter whether the status_bit was set or not.
Signed-off-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
Fixes: cc7c2bb149 ("reset: add TI SYSCON based reset driver")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Here are a bunch of USB fixes for 4.10-rc3. Yeah, it's a lot, an
artifact of the holiday break I think. Lots of gadget and the usual
XHCI fixups for reported issues (one day that driver will calm down...)
Also included are a bunch of usb-serial driver fixes, and for good
measure, a number of much-reported MUSB driver issues have finally been
resolved.
All of these have been in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are a bunch of USB fixes for 4.10-rc3. Yeah, it's a lot, an
artifact of the holiday break I think.
Lots of gadget and the usual XHCI fixups for reported issues (one day
that driver will calm down...) Also included are a bunch of usb-serial
driver fixes, and for good measure, a number of much-reported MUSB
driver issues have finally been resolved.
All of these have been in linux-next with no reported issues"
* tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (72 commits)
USB: fix problems with duplicate endpoint addresses
usb: ohci-at91: use descriptor-based gpio APIs correctly
usb: storage: unusual_uas: Add JMicron JMS56x to unusual device
usb: hub: Move hub_port_disable() to fix warning if PM is disabled
usb: musb: blackfin: add bfin_fifo_offset in bfin_ops
usb: musb: fix compilation warning on unused function
usb: musb: Fix trying to free already-free IRQ 4
usb: musb: dsps: implement clear_ep_rxintr() callback
usb: musb: core: add clear_ep_rxintr() to musb_platform_ops
USB: serial: ti_usb_3410_5052: fix NULL-deref at open
USB: serial: spcp8x5: fix NULL-deref at open
USB: serial: quatech2: fix sleep-while-atomic in close
USB: serial: pl2303: fix NULL-deref at open
USB: serial: oti6858: fix NULL-deref at open
USB: serial: omninet: fix NULL-derefs at open and disconnect
USB: serial: mos7840: fix misleading interrupt-URB comment
USB: serial: mos7840: remove unused write URB
USB: serial: mos7840: fix NULL-deref at open
USB: serial: mos7720: remove obsolete port initialisation
USB: serial: mos7720: fix parallel probe
...
Here are a few small char/misc driver fixes for 4.10-rc3.
2 MEI driver fixes, and 3 NVMEM patches for reported issues, and a new
Hyper-V driver MAINTAINER update. Nothing major at all, all have been
in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc fixes from Greg KH:
"Here are a few small char/misc driver fixes for 4.10-rc3.
Two MEI driver fixes, and three NVMEM patches for reported issues, and
a new Hyper-V driver MAINTAINER update. Nothing major at all, all have
been in linux-next with no reported issues"
* tag 'char-misc-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
hyper-v: Add myself as additional MAINTAINER
nvmem: fix nvmem_cell_read() return type doc
nvmem: imx-ocotp: Fix wrong register size
nvmem: qfprom: Allow single byte accesses for read/write
mei: move write cb to completion on credentials failures
mei: bus: fix mei_cldev_enable KDoc
Here are some staging and IIO driver fixes for 4.10-rc3.
Most of these are minor IIO fixes of reported issues, along with one
network driver fix to resolve an issue. And a MAINTAINERS update with a
new mailing list. All of these, except the MAINTAINERS file update,
have been in linux-next with no reported issues (the MAINTAINERS patch
happened on Friday...)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging/IIO fixes from Greg KH:
"Here are some staging and IIO driver fixes for 4.10-rc3.
Most of these are minor IIO fixes of reported issues, along with one
network driver fix to resolve an issue. And a MAINTAINERS update with
a new mailing list. All of these, except the MAINTAINERS file update,
have been in linux-next with no reported issues (the MAINTAINERS patch
happened on Friday...)"
* tag 'staging-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
MAINTAINERS: add greybus subsystem mailing list
staging: octeon: Call SET_NETDEV_DEV()
iio: accel: st_accel: fix LIS3LV02 reading and scaling
iio: common: st_sensors: fix channel data parsing
iio: max44000: correct value in illuminance_integration_time_available
iio: adc: TI_AM335X_ADC should depend on HAS_DMA
iio: bmi160: Fix time needed to sleep after command execution
iio: 104-quad-8: Fix active level mismatch for the preset enable option
iio: 104-quad-8: Fix off-by-one errors when addressing IOR
iio: 104-quad-8: Fix index control configuration
Several people report seeing warnings about inconsistent radix tree
nodes followed by crashes in the workingset code, which all looked like
use-after-free access from the shadow node shrinker.
Dave Jones managed to reproduce the issue with a debug patch applied,
which confirmed that the radix tree shrinking indeed frees shadow nodes
while they are still linked to the shadow LRU:
WARNING: CPU: 2 PID: 53 at lib/radix-tree.c:643 delete_node+0x1e4/0x200
CPU: 2 PID: 53 Comm: kswapd0 Not tainted 4.10.0-rc2-think+ #3
Call Trace:
delete_node+0x1e4/0x200
__radix_tree_delete_node+0xd/0x10
shadow_lru_isolate+0xe6/0x220
__list_lru_walk_one.isra.4+0x9b/0x190
list_lru_walk_one+0x23/0x30
scan_shadow_nodes+0x2e/0x40
shrink_slab.part.44+0x23d/0x5d0
shrink_node+0x22c/0x330
kswapd+0x392/0x8f0
This is the WARN_ON_ONCE(!list_empty(&node->private_list)) placed in the
inlined radix_tree_shrink().
The problem is with 14b468791f ("mm: workingset: move shadow entry
tracking to radix tree exceptional tracking"), which passes an update
callback into the radix tree to link and unlink shadow leaf nodes when
tree entries change, but forgot to pass the callback when reclaiming a
shadow node.
While the reclaimed shadow node itself is unlinked by the shrinker, its
deletion from the tree can cause the left-most leaf node in the tree to
be shrunk. If that happens to be a shadow node as well, we don't unlink
it from the LRU as we should.
Consider this tree, where the s are shadow entries:
root->rnode
|
[0 n]
| |
[s ] [sssss]
Now the shadow node shrinker reclaims the rightmost leaf node through
the shadow node LRU:
root->rnode
|
[0 ]
|
[s ]
Because the parent of the deleted node is the first level below the
root and has only one child in the left-most slot, the intermediate
level is shrunk and the node containing the single shadow is put in
its place:
root->rnode
|
[s ]
The shrinker again sees a single left-most slot in a first level node
and thus decides to store the shadow in root->rnode directly and free
the node - which is a leaf node on the shadow node LRU.
root->rnode
|
s
Without the update callback, the freed node remains on the shadow LRU,
where it causes later shrinker runs to crash.
Pass the node updater callback into __radix_tree_delete_node() in case
the deletion causes the left-most branch in the tree to collapse too.
Also add warnings when linked nodes are freed right away, rather than
wait for the use-after-free when the list is scanned much later.
Fixes: 14b468791f ("mm: workingset: move shadow entry tracking to radix tree exceptional tracking")
Reported-by: Dave Chinner <david@fromorbit.com>
Reported-by: Hugh Dickins <hughd@google.com>
Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-and-tested-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Leech <cleech@redhat.com>
Cc: Lee Duncan <lduncan@suse.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@linuxonhyperv.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4.10-rc loadtest (even on x86, and even without THPCache) fails with
"fork: Cannot allocate memory" or some such; and /proc/meminfo shows
PageTables growing.
Commit 953c66c2b2 ("mm: THP page cache support for ppc64") that got
merged in rc1 removed the freeing of an unused preallocated pagetable
after do_fault_around() has called map_pages().
This is usually a good optimization, so that the followup doesn't have
to reallocate one; but it's not sufficient to shift the freeing into
alloc_set_pte(), since there are failure cases (most commonly
VM_FAULT_RETRY) which never reach finish_fault().
Check and free it at the outer level in do_fault(), then we don't need
to worry in alloc_set_pte(), and can restore that to how it was (I
cannot find any reason to pte_free() under lock as it was doing).
And fix a separate pagetable leak, or crash, introduced by the same
change, that could only show up on some ppc64: why does do_set_pmd()'s
failure case attempt to withdraw a pagetable when it never deposited
one, at the same time overwriting (so leaking) the vmf->prealloc_pte?
Residue of an earlier implementation, perhaps? Delete it.
Fixes: 953c66c2b2 ("mm: THP page cache support for ppc64")
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
