Provide a simple driver for GPIO controllable vibrators.
It will be used by the Fairphone 2.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
The isl68137 is a digital output 7-phrase configurable PWM controller
with an AVSBus interface from Intersil.
Signed-off-by: Patrick Venture <venture@google.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rob Herring <robh@kernel.org>
axp805 is actually compatible and used with axp806 as fallback.
But it's actually undocumented and trig a warning with checkpatch.
DT compatible string "x-powers,axp805" appears un-documented.
Add this compatible in the dt-bindings documentation.
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
KVM_GET_DIRTY_LOG is implemented by all architectures, not just x86,
and KVM_CAP_MANUAL_DIRTY_LOG_PROTECT is additionally implemented by
arm, arm64, and mips.
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Allow users to disable usage of MIO instructions by specifying pci=nomio
at the kernel command line.
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Provide a kernel parameter to force the usage of floating interrupts.
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This modernizes the IXP4xx platform and adds initial Device Tree
Support. We migrate to MULTI_IRQ_HANDLER, bumps the IRQs to
offset 16, converts to SPARSE_IRQ, then we add proper subsystem
drivers in each subsystem for irqchip, GPIO and clocksource and
switch over to using these new drivers.
Next we modernize the NPE and QMGR drivers and push them down
into drivers/soc.
This has been tested on the IXP4xx NSLU2 and the Gateworks
GW2358-4.
* tag 'ixp4xx-for-armsoc' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-nomadik: (31 commits)
ARM: dts: Add queue manager and NPE to the IXP4xx DTSI
soc: ixp4xx: qmgr: Add DT probe code
soc: ixp4xx: qmgr: Add DT bindings for IXP4xx qmgr
soc: ixp4xx: npe: Add DT probe code
soc: ixp4xx: Add DT bindings for IXP4xx NPE
soc: ixp4xx: qmgr: Pass resources
soc: ixp4xx: Remove unused functions
soc: ixp4xx: Uninline several functions
soc: ixp4xx: npe: Pass addresses as resources
ARM: ixp4xx: Turn the QMGR into a platform device
ARM: ixp4xx: Turn the NPE into a platform device
ARM: ixp4xx: Move IXP4xx QMGR and NPE headers
ARM: ixp4xx: Move NPE and QMGR to drivers/soc
ARM: dts: Add some initial IXP4xx device trees
ARM: ixp4xx: Add device tree boot support
ARM: ixp4xx: Add DT bindings
gpio: ixp4xx: Add OF probing support
gpio: ixp4xx: Add DT bindings
clocksource/drivers/ixp4xx: Add OF initialization support
clocksource/drivers/ixp4xx: Add DT bindings
...
Signed-off-by: Olof Johansson <olof@lixom.net>
arm64: zynqmp: SoC changes for v5.2
- Add support for ZynqMP fpga manager
- Defer some probes which depends on firmware driver to be ready
- Debugfs fix
* tag 'zynqmp-soc-for-v5.2' of https://github.com/Xilinx/linux-xlnx:
fpga manager: Adding FPGA Manager support for Xilinx zynqmp
dt-bindings: fpga: Add bindings for ZynqMP fpga driver
firmware: xilinx: Add fpga API's
drivers: Defer probe if firmware is not ready
firmware: xilinx: fix debugfs write handler
Signed-off-by: Olof Johansson <olof@lixom.net>
Driver changes for ti-sysc for v5.2 merge window
This series of changes for ti-sysc interconnect target module driver
gets us to the point where we can actually drop legacy platform data
for many devices in favor of device tree data.
To do this, we improve ti-sysc driver not to rely on platform data
callbacks to manage module clocks, and handle more quirks needed for
some devices. Also few minor fixes are needed, but were considered
not needed to be sent separately as they only show up with this series.
Then we drop several thousands of lines of legacy platform data for
omap4, omap5, dra7, am335x and am437x. We drop platform data for mmc,
i2c, gpio and uart devices to start with as those are typically
easily tested on all devices. In case of unexpected issues, we can just
add back the legacy platform data for a single device type if needed.
Finally we add initial support for enabling and disabling some devices
without legacy platform data callbacks. I was planning on sending the
dropping of legacy platform data as a separate series, but already
applied Roger's patch on top and pushed it out.
Note that this series depends on related SoC and is based on those.
* tag 'omap-for-v5.2/ti-sysc-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap: (33 commits)
bus: ti-sysc: Add generic enable/disable functions
ARM: OMAP2+: Drop mcspi platform data for omap4
ARM: OMAP2+: Drop uart platform data for dra7
ARM: OMAP2+: Drop gpio platform data for dra7
ARM: OMAP2+: Drop i2c platform data for dra7
ARM: OMAP2+: Drop mmc platform data for dra7
ARM: OMAP2+: Drop uart platform data for omap5
ARM: OMAP2+: Drop gpio platform data for omap5
ARM: OMAP2+: Drop i2c platform data for omap5
ARM: OMAP2+: Drop mmc platform data for omap5
ARM: OMAP2+: Drop uart platform data for am33xx and am43xx
ARM: OMAP2+: Drop gpio platform data for am33xx and am43xx
ARM: OMAP2+: Drop i2c platform data for am33xx and am43xx
ARM: OMAP2+: Drop mmc platform data for am330x and am43xx
ARM: OMAP2+: Drop uart platform data for omap4
ARM: OMAP2+: Drop gpio platform data for omap4
ARM: OMAP2+: Drop i2c platform data for omap4
ARM: OMAP2+: Drop mmc platform data for omap4
Documentation: bus: ti-sysc: fix spelling mistakes "multipe" and "interconnet"
bus: ti-sysc: Detect DMIC for debugging
...
Signed-off-by: Olof Johansson <olof@lixom.net>
mt8173:
- use assinged-clocks and assigned-clock-parents
- fix compatible for SoC to a72
- add pmu nodes
mt8183:
- add sysirq binding
- add pinctrl dt header file
mt7629:
- update bindings description fo sysirq, uart and scpsys
mt8516:
- add binding description for watchdog, timer, uart and sysirq
* tag 'v5.1-next-dts64' of https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux:
arm64: dts: mt8173: add pmu nodes for mt8173
arm64: dts: mt8173: correct cpu type of cpu2 and cpu3 to cortex-a72
dt-bindings: irq: mtk,sysirq: add support for MT8516
dt-bindings: serial: mtk-uart: add support for MT8516
dt-bindings: timer: mtk-timer: add support for MT8516
dt-bindings: wdog: mtk-wdt: add support for MT851
dt-bindings: soc: fix a typo for MT7623A
dt-bindings: mediatek: update bindings for MT7629 SoC
arm64: dts: mt8183: add pinctrl file
dt-bindings: mtk-sysirq: Add compatible for Mediatek MT8183
arm64: dts: Using standard CCF interface to set vcodec clk
Signed-off-by: Olof Johansson <olof@lixom.net>
The old "cooling-{min,max}-state" properties for thermal bindings were
ratified to "cooling-{min,max}-level" by commit eb168b70de ("of:
thermal: Fix inconsitency between cooling-*-state and cooling-*-level"),
which were later removed entirely by commit e04907dbc2 ("dt-bindings:
thermal: Remove "cooling-{min|max}-level" properties").
The pwm-fan binding, however, was apparently in-flight in parallel with
that ratification, and so managed to introduce an example of the old
properties which escaped the scope of the later cleanup and has thus
continued to be dutifully copied for new boards despite being useless.
Clean up these remaining undocumented anachronisms to minimise any
further confusion.
Acked-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Renesas ARM Based SoC DT Bindings Updates for v5.2
* R-Car M3-N (r8a77965) SoC
- Remove non-existent A3IR power domain
* Add vendor prefix for Silicon Linux
* tag 'renesas-dt-bindings-for-v5.2' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
dt-bindings: power: r8a77965: Remove non-existent A3IR power domain
dt-bindings: Add vendor prefix for Silicon Linux.
Signed-off-by: Olof Johansson <olof@lixom.net>
Allwinner DT changes for 5.2
This PR is pretty significant, but it been mostly about:
- Fixing the DTC warnings in most of our DT. We're now down to 2
warnings, from several thousands.
- Fixing a good number of minor issues, typos, and so on thanks to the DT
validation tools
- Describe the MBUS controller and the special DMA RAM mapping on the A13
- Add support for the LRADC on the A83t
- Add support for the I2C bus used for the PMIC on the A33
- Start using the DT annotation /omit-if-no-ref/ on our pinctrl nodes
* tag 'sunxi-dt-for-5.2' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux: (65 commits)
ARM: dts: sun8i: a83t: Enable USB OTG controller on some boards
ARM: dtsi: axp81x: add USB power supply node
ARM: dts: sun5i: Reorder pinctrl nodes
ARM: dts: sun6i: i7: Remove useless property
ARM: dts: sun4i: lime: Fix the USB PHY ID detect GPIO properties
ARM: dts: sun4i: protab2: Remove stale pinctrl-names entry
ARM: dts: sunxi: Remove useless phy-names from EHCI and OHCI
ARM: dts: sun8i: v40: bananapi-m2-berry: Sort device node dereferences.
ARM: dts: sun5i: Add the MBUS controller
dt-bindings: sunxi: Add compatible for OrangePi 3 board
ARM: dts: sun8i: a83t: Add I2C2 pinmux setting for PE pins
dt-bindings: arm: sunxi: Add Beelink GS1 board
ARM: dts: sun8i: tbs-a711: Add support for volume keys input
ARM: dts: sunxi: Add R_LRADC support for A83T
ARM: dts: sunxi: Improve A33 NAND transfers by using DMA
ARM: dts: sun8i: tbs-a711: Enable UART2 (for NEO-6M GPS module)
ARM: dts: sunxi: Remove useless pinctrl nodes
ARM: dts: sunxi: Remove pinctrl groups setting bias
ARM: dts: sunxi: Remove useless address and size cells
ARM: dts: sunxi: Conform to DT spec for NAND controller
...
Signed-off-by: Olof Johansson <olof@lixom.net>
Devicetree changes for omap4 and 5 l4 abe interconnect
This series of devicetree changes adds the l4 abe interconnect devices
and moves the devices to their right places in the hierarchy similar
to what we've already done for most l4 devices earlier. We first add
a shared omap4-mcpdm.dtsi to make adding omap4-l4-abe.dtsi easier for
the mcpdm changes. And as earlier, in case of unexpected trouble,
devices can be probed the old way by moving one device at a time to the
old place.
This series of changes depends on the ti-sysc driver changes for handling
the external optional clocks that the mcpdm relies on, and is based on
the related ti-sysc driver changes. Note that this series does not depend
on dropping of the leagcy platform data, but I already had those committed
along with the ti-sysc driver changes and noticed too late.
* tag 'omap-for-v5.2/dt-ti-sysc-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap: (44 commits)
ARM: dts: Add l4 abe interconnect hierarchy and ti-sysc data for omap5
ARM: dts: Add l4 abe interconnect hierarchy and ti-sysc data for omap4
ARM: dts: Add common mcpdm dts file for omap4
bus: ti-sysc: Add generic enable/disable functions
ARM: OMAP2+: Drop mcspi platform data for omap4
ARM: OMAP2+: Drop uart platform data for dra7
ARM: OMAP2+: Drop gpio platform data for dra7
ARM: OMAP2+: Drop i2c platform data for dra7
ARM: OMAP2+: Drop mmc platform data for dra7
ARM: OMAP2+: Drop uart platform data for omap5
ARM: OMAP2+: Drop gpio platform data for omap5
ARM: OMAP2+: Drop i2c platform data for omap5
ARM: OMAP2+: Drop mmc platform data for omap5
ARM: OMAP2+: Drop uart platform data for am33xx and am43xx
ARM: OMAP2+: Drop gpio platform data for am33xx and am43xx
ARM: OMAP2+: Drop i2c platform data for am33xx and am43xx
ARM: OMAP2+: Drop mmc platform data for am330x and am43xx
ARM: OMAP2+: Drop uart platform data for omap4
ARM: OMAP2+: Drop gpio platform data for omap4
ARM: OMAP2+: Drop i2c platform data for omap4
...
Signed-off-by: Olof Johansson <olof@lixom.net>
Devicetree changes for omap variants
This series of changes configures dra7 pcie x2 lane mode, configures
am43xx-epos-evm regulators and keypad wakeup source, and uses standard
reset-gpios instead of gpio-reset for n810.
We also need to split dra7 dtsi files for properly supporting dra76x
and am576 as some of the devices are different such as usb and pruss.
* tag 'omap-for-v5.2/dt-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: dts: dra7: Separate AM57 dtsi files
dt-binding: arm: omap: Add information for AM5748
ARM: dts: omap2420-n810: Use new CODEC reset pin name
ARM: dts: am43xx-epos-evm: Add matrix keypad as wakeup source
ARM: dts: am43xx-epos-evm: Keep DCDC3 regulator on in suspend to memory
ARM: dts: am43xx-epos-evm: Keep DCDC5 and DCDC6 always on
ARM: dts: dra7: Add properties to enable PCIe x2 lane mode
Signed-off-by: Olof Johansson <olof@lixom.net>
ARM64: DT: Hisilicon SoCs DT updates for 5.2
* Hi3660 SoC and related boards:
- Added DMA support for the uart nodes
- Added the asp DMA controller node
- Replaced dma-min-chan with dma-channel-mask to follow the binding
* Hi3670 SoC and related boards:
- Reused Hi3660 reset to support Hi3670, updated the binding
document and added dts node
- Reused Hi3660 MMC controller to support Hi3670, updated the
binding document and added related nodes to support SD and WiFi
for the SoC and hikey970 board
- Added UFS controller node
* tag 'hisi-arm64-dt-for-5.2' of git://github.com/hisilicon/linux-hisi:
arm64: dts: hisilicon: hi3670: Add UFS controller support
arm64: dts: hi3660: Fixup unofficial dma-min-chan to dma-channel-mask
arm64: dts: hi3660: Add hisi asp dma device
arm64: dts: hi3660: Add dma to uart nodes
arm64: dts: hisilicon: hikey970: Add SD and WiFi support
arm64: dts: hisilicon: hi3670: Add MMC controller support
dt-bindings: mmc: Add HI3670 MMC controller binding
arm64: dts: hisilicon: hi3670: Add reset controller support
dt-bindings: reset: Add HI3670 reset controller binding
Signed-off-by: Olof Johansson <olof@lixom.net>
arm64: dts: zynqmp: DT changes for v5.2
- Align xlnx-zynqmp-clk.h file name and separate
binding for clock driver
- Add TI quirks to zynqmp boards
* tag 'zynqmp-dt-for-v5.2' of https://github.com/Xilinx/linux-xlnx:
arm64: zynqmp: dt: Add TI PHY quirk
dt-bindings: xilinx: Separate clock binding from firmware doc
include: dt-binding: clock: Rename zynqmp header file
Signed-off-by: Olof Johansson <olof@lixom.net>
Core new soc features are hdmi-cec for rk3328, scheduler capacity-values
and emmc cleanups for rk3399. New boards are the OrangePi (rk3399) and
NanoPi NEO4. Both the OrangePi as well as the NanoPC/Pie family also
directly got some additional features added after the boards itself.
The Rock960 family (rock960+ficus) got their power-tree cleaned to match
the schematics and also got hdmi-audio and their gpu enabled.
Mali support also got enabled on the RockPi4 and finally both
rk3328-rock64 and rk3328-roc-cc got some additional features.
* tag 'v5.2-rockchip-dts64-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip: (23 commits)
arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-puma
arm64: dts: rockchip: Define drive-impedance-ohm for RK3399's emmc-phy.
arm64: dts: rockchip: Disable DCMDs on RK3399's eMMC controller.
arm64: dts: rockchip: Add nanopi4 ethernet phy
arm64: dts: rockchip: Add PWM fan for NanoPC-T4
arm64: dts: rockchip: Add the fusb typec manager to rk3399-orangepi
arm64: dts: rockchip: Specify vid supply for the rk3399-orangepi compass (AK09911)
arm64: dts: rockchip: Fix clock names and add missing supplies for bluetooth on rk3399-orangepi
arm64: dts: rockchip: Add 12V DCIN regulator to rk3399-ficus
arm64: dts: rockchip: Rename vcc_sys into vcc5v0_sys on rk3399-rock960
arm64: dts: rockchip: Add Nanopi NEO4 initial support
arm64: dts: rockchip: enable hdmi audio out for rk3399-rockpro64
arm64: dts: rockchip: Add support for the Orange Pi RK3399 board.
arm64: dts: rockchip: enable mali on rock960 boards
arm64: dts: rockchip: enable mali on Rock Pi 4
arm64: dts: rockchip: add rk3328-roc-cc cpu-supply entries for all cpu nodes
arm64: dts: rockchip: give some life to the rk3328-roc-cc leds
arm64: dts: rockchip: add #sound-dai-cells to HDMI of rk3328
arm64: dts: rockchip: add ir-receiver node on rk3328-rock64
arm64: dts: rockchip: add leds node on rk3328-rock64
...
Signed-off-by: Olof Johansson <olof@lixom.net>
Quite a bit of love for the rk3288-veyron chromeos devices and a number
of cleanups for rk3288 from that area, hdmi support for the old rk3066
a small rv1108-eglin-r1 cleanup and wifi+hdmi-cec for the tinker board.
* tag 'v5.2-rockchip-dts32-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
ARM: dts: rockchip: enable vop0 and hdmi nodes to rk3066a-mk808
ARM: dts: rockchip: add rk3066 hdmi nodes
ARM: dts: rockchip: Add device tree for rk3288-veyron-mighty
dt-bindings: ARM: dts: rockchip: Add bindings for rk3288-veyron-mighty
ARM: dts: rockchip: Add vdd_logic to rk3288-veyron
ARM: dts: rockchip: Add dvs-gpios to rk3288-veyron-jerry
ARM: dts: rockchip: Add rk3288-veyron-jerry rev 10-15
dt-bindings: ARM: dts: rockchip: Add rk3288-veyron-jerry rev 10-15
ARM: dts: rockchip: Fix gic/efuse sort ordering for rk3288
ARM: dts: rockchip: Enable WiFi on rk3288-tinker
ARM: dts: rockchip: add grf reference in rk3288 tsadc node
ARM: dts: rockchip: Enable HDMI CEC on rk3288-tinker-s
ARM: dts: rockchip: remove disable-wp from rv1108-elgin-r1 emmc node
Signed-off-by: Olof Johansson <olof@lixom.net>
scripts/mkutf8data is used only when regenerating utf8data.h,
which never happens in the normal kernel build. However, it is
irrespectively built if CONFIG_UNICODE is enabled.
Moreover, there is no good reason for it to reside in the scripts/
directory since it is only used in fs/unicode/.
Hence, move it from scripts/ to fs/unicode/.
In some cases, we bypass build artifacts in the normal build. The
conventional way to do so is to surround the code with ifdef REGENERATE_*.
For example,
- 7373f4f83c ("kbuild: add implicit rules for parser generation")
- 6aaf49b495 ("crypto: arm,arm64 - Fix random regeneration of S_shipped")
I rewrote the rule in a more kbuild'ish style.
In the normal build, utf8data.h is just shipped from the check-in file.
$ make
[ snip ]
SHIPPED fs/unicode/utf8data.h
CC fs/unicode/utf8-norm.o
CC fs/unicode/utf8-core.o
CC fs/unicode/utf8-selftest.o
AR fs/unicode/built-in.a
If you want to generate utf8data.h based on UCD, put *.txt files into
fs/unicode/, then pass REGENERATE_UTF8DATA=1 from the command line.
The mkutf8data tool will be automatically compiled to generate the
utf8data.h from the *.txt files.
$ make REGENERATE_UTF8DATA=1
[ snip ]
HOSTCC fs/unicode/mkutf8data
GEN fs/unicode/utf8data.h
CC fs/unicode/utf8-norm.o
CC fs/unicode/utf8-core.o
CC fs/unicode/utf8-selftest.o
AR fs/unicode/built-in.a
I renamed the check-in utf8data.h to utf8data.h_shipped so that this
will work for the out-of-tree build.
You can update it based on the latest UCD like this:
$ make REGENERATE_UTF8DATA=1 fs/unicode/
$ cp fs/unicode/utf8data.h fs/unicode/utf8data.h_shipped
Also, I added entries to .gitignore and dontdiff.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This new sysfs entry is used to interpret ring buffer information,
mainly by Android sensor HAL.
It expand to all sensors, the documentation about 'id' we can found
in Documentation/ABI/testing/sysfs-bus-iio-cros-ec.
Also fix typo in docs, I replace 'Septembre' by 'September'.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Mikulas Patocka reported that commit 1c30844d2d ("mm: reclaim small
amounts of memory when an external fragmentation event occurs") "broke"
memory management on parisc.
The machine is not NUMA but the DISCONTIG model creates three pgdats
even though it's a UMA machine for the following ranges
0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB
1) Start 0x0000000100000000 End 0x00000001bfdfffff Size 3070 MB
2) Start 0x0000004040000000 End 0x00000040ffffffff Size 3072 MB
Mikulas reported:
With the patch 1c30844d2, the kernel will incorrectly reclaim the
first zone when it fills up, ignoring the fact that there are two
completely free zones. Basiscally, it limits cache size to 1GiB.
For example, if I run:
# dd if=/dev/sda of=/dev/null bs=1M count=2048
- with the proper kernel, there should be "Buffers - 2GiB"
when this command finishes. With the patch 1c30844d2, buffers
will consume just 1GiB or slightly more, because the kernel was
incorrectly reclaiming them.
The page allocator and reclaim makes assumptions that pgdats really
represent NUMA nodes and zones represent ranges and makes decisions on
that basis. Watermark boosting for small pgdats leads to unexpected
results even though this would have behaved reasonably on SPARSEMEM.
DISCONTIG is essentially deprecated and even parisc plans to move to
SPARSEMEM so there is no need to be fancy, this patch simply disables
watermark boosting by default on DISCONTIGMEM.
Link: http://lkml.kernel.org/r/20190419094335.GJ18914@techsingularity.net
Fixes: 1c30844d2d ("mm: reclaim small amounts of memory when an external fragmentation event occurs")
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Tested-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
We already prevent crash when dereferencing some obviously broken
pointers. But the handling is not consistent. Sometimes we print "(null)"
only for pure NULL pointer, sometimes for pointers in the first
page and sometimes also for pointers in the last page (error codes).
Note that printk() call this code under logbuf_lock. Any recursive
printks are redirected to the printk_safe implementation and the messages
are stored into per-CPU buffers. These buffers might be eventually flushed
in printk_safe_flush_on_panic() but it is not guaranteed.
This patch adds a check using probe_kernel_read(). It is not a full-proof
test. But it should help to see the error message in 99% situations where
the kernel would silently crash otherwise.
Also it makes the error handling unified for "%s" and the many %p*
specifiers that need to read the data from a given address. We print:
+ (null) when accessing data on pure pure NULL address
+ (efault) when accessing data on an invalid address
It does not affect the %p* specifiers that just print the given address
in some form, namely %pF, %pf, %pS, %ps, %pB, %pK, %px, and plain %p.
Note that we print (efault) from security reasons. In fact, the real
address can be seen only by %px or eventually %pK.
Link: http://lkml.kernel.org/r/20190417115350.20479-9-pmladek@suse.com
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Tobin C . Harding" <me@tobin.cc>
Cc: Joe Perches <joe@perches.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
The architecture implementations of 'arch_futex_atomic_op_inuser()' and
'futex_atomic_cmpxchg_inatomic()' are permitted to return only -EFAULT,
-EAGAIN or -ENOSYS in the case of failure.
Update the comments in the asm-generic/ implementation and also a stray
reference in the robust futex documentation.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Pull in core support for the "mitigations=" cmdline option from Thomas
Gleixner via -tip, which we can build on top of when we expose our
mitigation state via sysfs.
This converts the plain text documentation to reStructuredText format
and adds it to Sphinx TOC tree.
No essential content change.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
