| Age | Commit message (Collapse) | Author | Files | Lines |
|---|
|
Add support to handle 'output-enable' and 'bias-high-impedance'
configurations.
Using these pinctrl properties observed hang issues with older PMUFW(Xilinx
ZynqMP Platform Management Firmware), hence reverted the patch.
Commit 9989bc33c4894e075167 ("Revert "pinctrl: pinctrl-zynqmp: Add support
for output-enable and bias-high-impedance"").
Support for configuring these properties added in PMUFW Configuration Set
version 2.0. When there is a request for these configurations from pinctrl
driver for ZynqMP platform, xilinx firmware driver checks for this version
before configuring these properties to avoid the hang issue and proceeds
further only when firmware version is >=2 otherwise it returns error.
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Reviewed-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add 'output-enable' configuration parameter to the properties list.
Using these pinctrl properties observed hang issues with older Xilinx
ZynqMP Platform Management Firmware, hence reverted the patch previously.
Commit ff8356060e3a5e126abb ("Revert "dt-bindings: pinctrl-zynqmp: Add
output-enable configuration"").
Support for configuring these properties added in Xilinx ZynqMP Platform
Management firmware(PMUFW) Configuration Set version 2.0. Linux firmware
driver checks if the configuration is supported by the PMUFW when it gets
request for TRISTATE configuration from pinctrl driver. If it supports,
then calls will be made otherwise it returns error.
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Support for configuring TRISTATE parameter is added in ZYNQMP PMUFW(Xilinx
ZynqMP Platform Management Firmware) Configuration Param Set version 2.0.
If the requested configuration is TRISTATE and platform is ZYNQMP then
check the version before requesting Xilinx firmware to set the
configuration.
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Reviewed-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add function to get family code and sub family code from the idcode. This
family code and sub family code helps to identify the platform.
Family code of any platform is on bits 21 to 27 and Sub family code is on
bits 19 and 20.
Signed-off-by: Dhaval Shah <[email protected]>
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Reviewed-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers into devel
pinctrl: renesas: Updates for v6.6
- Use the new devm_clk_get_enabled() helper.
Signed-off-by: Linus Walleij <[email protected]>
|
|
pinmux_generic_add_function()
pinctrl_generic_add_function() doesn't check result of radix_tree_insert()
despite they both may return a negative error code. Linus Walleij said he
has copied the radix tree code from kernel/irq/ where the functions calling
radix_tree_insert() are *void* themselves; I think it makes more sense to
propagate the errors from radix_tree_insert() upstream if we can do that...
Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.
Signed-off-by: Sergey Shtylyov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
pinctrl_register_one_pin() doesn't check the result of radix_tree_insert()
despite they both may return a negative error code. Linus Walleij said he
has copied the radix tree code from kernel/irq/ where the functions calling
radix_tree_insert() are *void* themselves; I think it makes more sense to
propagate the errors from radix_tree_insert() upstream if we can do that...
Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.
Signed-off-by: Sergey Shtylyov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
pinctrl_generic_add_group() doesn't check the result of radix_tree_insert()
despite they both may return a negative error code. Linus Walleij said he
has copied the radix tree code from kernel/irq/ where the functions calling
radix_tree_insert() are *void* themselves; I think it makes more sense to
propagate the errors from radix_tree_insert() upstream if we can do that...
Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.
Signed-off-by: Sergey Shtylyov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Document qcom,pmc8180-gpio and qcom,pmc8180c-gpio compatibles already
used in DTS and in the same binding in allOf:if:then section for
narrowing available GPIOs:
sc8180x-primus.dtb: pmic@4: gpio@c000:compatible:0: 'qcom,pmc8180c-gpio' is not one of ...
Fixes: 04bed6407ee6 ("dt-bindings: pinctrl: qcom,pmic-gpio: describe gpio-line-names")
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
|
|
Add support for the pin controller block on SM6115's Low Power Island.
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
|
|
Add bindings for pin controller in SM6115 Low Power Audio SubSystem
LPASS).
Signed-off-by: Konrad Dybcio <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
|
|
The devm_clk_get_enabled() helper:
- calls devm_clk_get()
- calls clk_prepare_enable() and registers what is needed in order to
call clk_disable_unprepare() when needed, as a managed resource.
This simplifies the code and avoids the need of a dedicated function used
with devm_add_action_or_reset().
While at it, use dev_err_probe() which filters -EPROBE_DEFER.
Signed-off-by: Christophe JAILLET <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/a4a586337d692f0ca396b80d275ba634eb419593.1690058500.git.christophe.jaillet@wanadoo.fr
[geert: Make clk local to rzg2l_pinctrl_probe()]
Signed-off-by: Geert Uytterhoeven <[email protected]>
|
|
Simplify clock handling by using the devm_clk_get_enabled() helper,
instead of open-coding the same operations. Move the clock pointer from
the driver-private data to a local variable, as it is not needed outside
the .probe() callback.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/cca0b1795fd0335401bdf2be393ab84445e04095.1688396836.git.geert+renesas@glider.be
|
|
Add driver for pin controller in Low Power Audio SubSystem (LPASS). The
driver is similar to SM8250 LPASS pin controller, with difference in one
new pin (gpio14) belonging to swr_tx_data.
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
|
|
Add bindings for pin controller in SM8350 Low Power Audio SubSystem
(LPASS).
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
|
|
On some systems amd_pinconf_set() is called with parameters
0x8 (PIN_CONFIG_DRIVE_PUSH_PULL) or 0x14 (PIN_CONFIG_PERSIST_STATE)
which are not supported by pinctrl-amd.
Don't show an err message when called with an invalid parameter,
downgrade this to debug instead.
Cc: [email protected] # 6.1
Fixes: 635a750d958e1 ("pinctrl: amd: Use amd_pinconf_set() for all config options")
Signed-off-by: Mario Limonciello <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add a new pinctrl driver for Amlogic C3 SoCs which share
the same register layout as the previous Amlogic S4.
Signed-off-by: Huqiang Qin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add a new compatible name for Amlogic C3 pin controller, and add
a new dt-binding header file which document the detail pin names.
Signed-off-by: Huqiang Qin <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.
Signed-off-by: Rob Herring <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Acked-by: Emil Renner Berthing <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
This property was introduced as a bad hack. Now that it's useless, get
rid of it.
Signed-off-by: Konrad Dybcio <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Some platforms provide a single clock source to all LPASS peripherals,
others provide two, and there are probably others that provide it through
magic invisible-to-Linux wires.
Rely on bindings to mandate the adequate number of clocks necessary.
Signed-off-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
The current function for a given pin is not displayed via the debugfs.
Add support to display the current function that is set for each pin.
Signed-off-by: Prathamesh Shete <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Reviewed-by: Jon Hunter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
The sunxi pinctrl has a fixed size array it uses to store regulators used
in the driver. There is currently nothing that ensures that the number of
elements in the array is large enough to map the regulators defined by the
individual SoCs. While this is currently the case having an explicit check
in there will make life easier for anyone debugging memory issues that
manifest in the driver so let's add one.
Signed-off-by: Mark Brown <[email protected]>
Reviewed-by: Chen-Yu Tsai <[email protected]>
Reviewed-by: Jernej Skrabec <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
This patch adds support for an optional "reset" GPIO pin in the cy8c95x0
pinctrl driver. On probe, the reset pin is pulled low to bring chip out
of reset. The reset pin has an internal pull-down and can be left
floating if not required.
The datasheet doesn't mention any timing related to the reset pin.
Based on empirical tests, it was found that the chip requires a
delay of 250 milliseconds before accepting I2C transfers after driving
the reset pin low. Therefore, a delay of 250ms is added before
proceeding with I2C transfers.
Signed-off-by: Patrick Rudolph <[email protected]>
Signed-off-by: Naresh Solanki <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
This patch adds support for an optional reset pin.
The reset pin is used to bring the chip into a known state and has an
internal pull-down, allowing it to be left floating if not needed.
Signed-off-by: Patrick Rudolph <[email protected]>
Signed-off-by: Naresh Solanki <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Allow gpio hog subnodes to the gpio subnode.
Fixes: 94df03a45276 ("dt-bindings: pinctrl: Convert Amlogic Meson pinctrl binding")
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/20230707-topic-amlogic-upstream-pinctrl-fix-bindings-v2-2-2160060446d7@linaro.org
Signed-off-by: Linus Walleij <[email protected]>
|
|
Allow gpio-line-names property for the gpio subnodes.
Fixes: 94df03a45276 ("dt-bindings: pinctrl: Convert Amlogic Meson pinctrl binding")
Signed-off-by: Neil Armstrong <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/20230707-topic-amlogic-upstream-pinctrl-fix-bindings-v2-1-2160060446d7@linaro.org
Signed-off-by: Linus Walleij <[email protected]>
|
|
Convert platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yangtao Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Convert platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yangtao Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Convert platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yangtao Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
pmx75 pmic support gpio controller so add compatible in the driver.
Signed-off-by: Rohit Agarwal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
pm7550ba pmic support gpio controller so add compatible in the driver.
Signed-off-by: Rohit Agarwal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add support for the pmx75 GPIO support to the Qualcomm PMIC GPIO
binding.
Signed-off-by: Rohit Agarwal <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Add support for the pm7550ba GPIO support to the Qualcomm PMIC GPIO
binding.
Signed-off-by: Rohit Agarwal <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>
|
|
Currently, sd1 and sd0 have unique subnode names 'sd1_mux' and 'sd0_mux'.
If we change these to non-unique subnode names such as 'mux' this can
lead to the below conflict as the RZ/G2L pin control driver considers
only the names of the subnodes.
pinctrl-rzg2l 11030000.pinctrl: pin P47_0 already requested by 11c00000.mmc; cannot claim for 11c10000.mmc
pinctrl-rzg2l 11030000.pinctrl: pin-376 (11c10000.mmc) status -22
pinctrl-rzg2l 11030000.pinctrl: could not request pin 376 (P47_0) from group mux on device pinctrl-rzg2l
renesas_sdhi_internal_dmac 11c10000.mmc: Error applying setting, reverse things back
Fix this by constructing unique names from the node names of both the
pin control configuration node and its child node, where appropriate.
Based on the work done by Geert for the RZ/V2M pinctrl driver.
Fixes: c4c4637eb57f ("pinctrl: renesas: Add RZ/G2L pin and gpio controller driver")
Signed-off-by: Biju Das <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>
|
|
The eMMC and SDHI pin control configuration nodes in DT have subnodes
with the same names ("data" and "ctrl"). As the RZ/V2M pin control
driver considers only the names of the subnodes, this leads to
conflicts:
pinctrl-rzv2m b6250000.pinctrl: pin P8_2 already requested by 85000000.mmc; cannot claim for 85020000.mmc
pinctrl-rzv2m b6250000.pinctrl: pin-130 (85020000.mmc) status -22
renesas_sdhi_internal_dmac 85020000.mmc: Error applying setting, reverse things back
Fix this by constructing unique names from the node names of both the
pin control configuration node and its child node, where appropriate.
Reported by: Fabrizio Castro <[email protected]>
Fixes: 92a9b825257614af ("pinctrl: renesas: Add RZ/V2M pin and gpio controller driver")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Tested-by: Fabrizio Castro <[email protected]>
Link: https://lore.kernel.org/r/607bd6ab4905b0b1b119a06ef953fa1184505777.1688396717.git.geert+renesas@glider.be
|
|
|
|
We just sorted the entries and fields last release, so just out of a
perverse sense of curiosity, I decided to see if we can keep things
ordered for even just one release.
The answer is "No. No we cannot".
I suggest that all kernel developers will need weekly training sessions,
involving a lot of Big Bird and Sesame Street. And at the yearly
maintainer summit, we will all sing the alphabet song together.
I doubt I will keep doing this. At some point "perverse sense of
curiosity" turns into just a cold dark place filled with sadness and
despair.
Repeats: 80e62bc8487b ("MAINTAINERS: re-sort all entries and fields")
Signed-off-by: Linus Torvalds <[email protected]>
|
|
git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping fixes from Christoph Hellwig:
- swiotlb area sizing fixes (Petr Tesarik)
* tag 'dma-mapping-6.5-2023-07-09' of git://git.infradead.org/users/hch/dma-mapping:
swiotlb: reduce the number of areas to match actual memory pool size
swiotlb: always set the number of areas before allocating the pool
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq update from Borislav Petkov:
- Optimize IRQ domain's name assignment
* tag 'irq_urgent_for_v6.5_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqdomain: Use return value of strreplace()
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fpu fix from Borislav Petkov:
- Do FPU AP initialization on Xen PV too which got missed by the recent
boot reordering work
* tag 'x86_urgent_for_v6.5_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/xen: Fix secondary processors' FPU initialization
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Thomas Gleixner:
"A single fix for the mechanism to park CPUs with an INIT IPI.
On shutdown or kexec, the kernel tries to park the non-boot CPUs with
an INIT IPI. But the same code path is also used by the crash utility.
If the CPU which panics is not the boot CPU then it sends an INIT IPI
to the boot CPU which resets the machine.
Prevent this by validating that the CPU which runs the stop mechanism
is the boot CPU. If not, leave the other CPUs in HLT"
* tag 'x86-core-2023-07-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/smp: Don't send INIT to boot CPU
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS fixes from Thomas Bogendoerfer:
- fixes for KVM
- fix for loongson build and cpu probing
- DT fixes
* tag 'mips_6.5_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: kvm: Fix build error with KVM_MIPS_DEBUG_COP0_COUNTERS enabled
MIPS: dts: add missing space before {
MIPS: Loongson: Fix build error when make modules_install
MIPS: KVM: Fix NULL pointer dereference
MIPS: Loongson: Fix cpu_probe_loongson() again
|
|
Pull xfs fix from Darrick Wong:
"Nothing exciting here, just getting rid of a gcc warning that I got
tired of seeing when I turn on gcov"
* tag 'xfs-6.5-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix uninit warning in xfs_growfs_data
|
|
git://git.samba.org/sfrench/cifs-2.6
Pull more smb client updates from Steve French:
- fix potential use after free in unmount
- minor cleanup
- add worker to cleanup stale directory leases
* tag '6.5-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
cifs: Add a laundromat thread for cached directories
smb: client: remove redundant pointer 'server'
cifs: fix session state transition to avoid use-after-free issue
|
|
Pull NTB updates from Jon Mason:
"Fixes for pci_clean_master, error handling in driver inits, and
various other issues/bugs"
* tag 'ntb-6.5' of https://github.com/jonmason/ntb:
ntb: hw: amd: Fix debugfs_create_dir error checking
ntb.rst: Fix copy and paste error
ntb_netdev: Fix module_init problem
ntb: intel: Remove redundant pci_clear_master
ntb: epf: Remove redundant pci_clear_master
ntb_hw_amd: Remove redundant pci_clear_master
ntb: idt: drop redundant pci_enable_pcie_error_reporting()
MAINTAINERS: git://github -> https://github.com for jonmason
NTB: EPF: fix possible memory leak in pci_vntb_probe()
NTB: ntb_tool: Add check for devm_kcalloc
NTB: ntb_transport: fix possible memory leak while device_register() fails
ntb: intel: Fix error handling in intel_ntb_pci_driver_init()
NTB: amd: Fix error handling in amd_ntb_pci_driver_init()
ntb: idt: Fix error handling in idt_pci_driver_init()
|
|
Lockdep is certainly right to complain about
(&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_write+0x2d/0x3f
but task is already holding lock:
(&mapping->i_mmap_rwsem){+.+.}-{3:3}, at: mmap_region+0x4dc/0x6db
Invert those to the usual ordering.
Fixes: 33313a747e81 ("mm: lock newly mapped VMA which can be modified after it becomes visible")
Cc: [email protected]
Signed-off-by: Hugh Dickins <[email protected]>
Tested-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull hotfixes from Andrew Morton:
"16 hotfixes. Six are cc:stable and the remainder address post-6.4
issues"
The merge undoes the disabling of the CONFIG_PER_VMA_LOCK feature, since
it was all hopefully fixed in mainline.
* tag 'mm-hotfixes-stable-2023-07-08-10-43' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
lib: dhry: fix sleeping allocations inside non-preemptable section
kasan, slub: fix HW_TAGS zeroing with slub_debug
kasan: fix type cast in memory_is_poisoned_n
mailmap: add entries for Heiko Stuebner
mailmap: update manpage link
bootmem: remove the vmemmap pages from kmemleak in free_bootmem_page
MAINTAINERS: add linux-next info
mailmap: add Markus Schneider-Pargmann
writeback: account the number of pages written back
mm: call arch_swap_restore() from do_swap_page()
squashfs: fix cache race with migration
mm/hugetlb.c: fix a bug within a BUG(): inconsistent pte comparison
docs: update ocfs2-devel mailing list address
MAINTAINERS: update ocfs2-devel mailing list address
mm: disable CONFIG_PER_VMA_LOCK until its fixed
fork: lock VMAs of the parent process when forking
|
|
When forking a child process, the parent write-protects anonymous pages
and COW-shares them with the child being forked using copy_present_pte().
We must not take any concurrent page faults on the source vma's as they
are being processed, as we expect both the vma and the pte's behind it
to be stable. For example, the anon_vma_fork() expects the parents
vma->anon_vma to not change during the vma copy.
A concurrent page fault on a page newly marked read-only by the page
copy might trigger wp_page_copy() and a anon_vma_prepare(vma) on the
source vma, defeating the anon_vma_clone() that wasn't done because the
parent vma originally didn't have an anon_vma, but we now might end up
copying a pte entry for a page that has one.
Before the per-vma lock based changes, the mmap_lock guaranteed
exclusion with concurrent page faults. But now we need to do a
vma_start_write() to make sure no concurrent faults happen on this vma
while it is being processed.
This fix can potentially regress some fork-heavy workloads. Kernel
build time did not show noticeable regression on a 56-core machine while
a stress test mapping 10000 VMAs and forking 5000 times in a tight loop
shows ~5% regression. If such fork time regression is unacceptable,
disabling CONFIG_PER_VMA_LOCK should restore its performance. Further
optimizations are possible if this regression proves to be problematic.
Suggested-by: David Hildenbrand <[email protected]>
Reported-by: Jiri Slaby <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Reported-by: Holger Hoffstätte <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Reported-by: Jacob Young <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217624
Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first")
Cc: [email protected]
Signed-off-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|