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2019-11-05drivers: provide devm_platform_ioremap_resource_byname()Bartosz Golaszewski1-0/+1
Provide a variant of devm_platform_ioremap_resource() that allows to lookup resources from platform devices by name rather than by index. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20191022084318.22256-7-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-05drivers: platform: provide devm_platform_ioremap_resource_wc()Bartosz Golaszewski1-0/+1
Provide a write-combined variant of devm_platform_ioremap_resource(). Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20191022084318.22256-5-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-05lib: devres: provide devm_ioremap_resource_wc()Bartosz Golaszewski1-0/+1
Provide a variant of devm_ioremap_resource() for write-combined ioremap. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20191022084318.22256-4-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-05Documentation: devres: add missing entry for devm_platform_ioremap_resource()Bartosz Golaszewski1-0/+1
devm_platform_ioremap_resource() should be documented in devres.rst. Add the missing entry. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20191022084318.22256-2-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-03debugfs: Add debugfs_create_xul() for hexadecimal unsigned longGeert Uytterhoeven1-1/+4
The existing debugfs_create_ulong() function supports objects of type "unsigned long", which are 32-bit or 64-bit depending on the platform, in decimal form. To format objects in hexadecimal, various debugfs_create_x*() functions exist, but all of them take fixed-size types. Add a debugfs helper for "unsigned long" objects in hexadecimal format. This avoids the need for users to open-code the same, or introduce bugs when casting the value pointer to "u32 *" or "u64 *" to call debugfs_create_x{32,64}(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20191025094130.26033-2-geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-03Documentation: debugfs: Document debugfs helper for unsigned long valuesGeert Uytterhoeven1-2/+8
When debugfs_create_ulong() was added, it was not documented. Fixes: c23fe83138ed7b11 ("debugfs: Add debugfs_create_ulong()") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Link: https://lore.kernel.org/r/20191021150645.32440-1-geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-03debugfs: remove return value of debugfs_create_atomic_t()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_atomic_t(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191016130332.GA28240@kroah.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-02debugfs: remove return value of debugfs_create_x8()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_x8(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191011132931.1186197-5-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-27Merge 5.4-rc5 into driver-core-nextGreg Kroah-Hartman41-250/+231
We want the sysfs fix in here as well to build on top of. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-25Merge tag 'armsoc-fixes' of ↵Linus Torvalds2-8/+5
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc Pull ARM SoC fixes from Olof Johansson: "A slightly larger set of fixes have accrued in the last two weeks. Mostly a collection of the usual smaller fixes: - Marvell Armada: USB phy setup issues on Turris Mox - Broadcom: GPIO/pinmux DT mapping corrections for Stingray, MMC bus width fix for RPi Zero W, GPIO LED removal for RPI CM3. Also some maintainer updates. - OMAP: Fixlets for display config, interrupt settings for wifi, some clock/PM pieces. Also IOMMU regression fix and a ti-sysc no-watchdog regression fix. - i.MX: A few fixes around PM/settings, some devicetree fixlets and catching up with config option changes in DRM - Rockchip: RockRro64 misc DT fixups, Hugsun X99 USB-C, Kevin display panel settings ... and some smaller fixes for Davinci (backlight, McBSP DMA), Allwinner (phy regulators, PMU removal on A64, etc)" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (42 commits) ARM: dts: stm32: relax qspi pins slew-rate for stm32mp157 MAINTAINERS: Update the Spreadtrum SoC maintainer MAINTAINERS: Remove Gregory and Brian for ARCH_BRCMSTB ARM: dts: bcm2837-rpi-cm3: Avoid leds-gpio probing issue bus: ti-sysc: Fix watchdog quirk handling ARM: OMAP2+: Add pdata for OMAP3 ISP IOMMU ARM: OMAP2+: Plug in device_enable/idle ops for IOMMUs ARM: davinci_all_defconfig: enable GPIO backlight ARM: davinci: dm365: Fix McBSP dma_slave_map entry ARM: dts: bcm2835-rpi-zero-w: Fix bus-width of sdhci ARM: imx_v6_v7_defconfig: Enable CONFIG_DRM_MSM arm64: dts: imx8mn: Use correct clock for usdhc's ipg clk arm64: dts: imx8mm: Use correct clock for usdhc's ipg clk arm64: dts: imx8mq: Use correct clock for usdhc's ipg clk ARM: dts: imx7s: Correct GPT's ipg clock source ARM: dts: vf610-zii-scu4-aib: Specify 'i2c-mux-idle-disconnect' ARM: dts: imx6q-logicpd: Re-Enable SNVS power key arm64: dts: lx2160a: Correct CPU core idle state name mailmap: Add Simon Arlott (replacement for expired email address) arm64: dts: rockchip: Fix override mode for rk3399-kevin panel ...
2019-10-25Merge tag 'devicetree-fixes-for-5.4-2' of ↵Linus Torvalds1-16/+13
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull Devicetree fixes from Rob Herring: "A couple more DT fixes for 5.4: fix a ref count, memory leak, and Risc-V cpu schema warnings" * tag 'devicetree-fixes-for-5.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: of: reserved_mem: add missing of_node_put() for proper ref-counting of: unittest: fix memory leak in unittest_data_add dt-bindings: riscv: Fix CPU schema errors
2019-10-23dt-bindings: riscv: Fix CPU schema errorsRob Herring1-16/+13
Fix the errors in the RiscV CPU DT schema: Documentation/devicetree/bindings/riscv/cpus.example.dt.yaml: cpu@0: 'timebase-frequency' is a required property Documentation/devicetree/bindings/riscv/cpus.example.dt.yaml: cpu@1: 'timebase-frequency' is a required property Documentation/devicetree/bindings/riscv/cpus.example.dt.yaml: cpu@0: compatible:0: 'riscv' is not one of ['sifive,rocket0', 'sifive,e5', 'sifive,e51', 'sifive,u54-mc', 'sifive,u54', 'sifive,u5'] Documentation/devicetree/bindings/riscv/cpus.example.dt.yaml: cpu@0: compatible: ['riscv'] is too short Documentation/devicetree/bindings/riscv/cpus.example.dt.yaml: cpu@0: 'timebase-frequency' is a required property The DT spec allows for 'timebase-frequency' to be in 'cpu' or 'cpus' node and RiscV requires it in /cpus node, so make it disallowed in cpu nodes. Fixes: 4fd669a8c487 ("dt-bindings: riscv: convert cpu binding to json-schema") Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: linux-riscv@lists.infradead.org Acked-by: Paul Walmsley <paul.walmsley@sifive.com> Signed-off-by: Rob Herring <robh@kernel.org>
2019-10-23Merge tag 'regulator-fix-v5.4-rc4' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator Pull regulator fixes from Mark Brown: "There are a few core fixes here around error handling and handling if suspend mode configuration and some driver specific fixes here but the most important change is the fix to the fixed-regulator DT schema conversion introduced during the last merge window. That fixes one of the last two errors preventing successful execution of "make dt_binding_check" which will be enormously helpful for DT schema development" * tag 'regulator-fix-v5.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: regulator: qcom-rpmh: Fix PMIC5 BoB min voltage regulator: pfuze100-regulator: Variable "val" in pfuze100_regulator_probe() could be uninitialized regulator: lochnagar: Add on_off_delay for VDDCORE regulator: ti-abb: Fix timeout in ti_abb_wait_txdone/ti_abb_clear_all_txdone regulator: da9062: fix suspend_enable/disable preparation dt-bindings: fixed-regulator: fix compatible enum regulator: fixed: Prevent NULL pointer dereference when !CONFIG_OF regulator: core: make regulator_register() EPROBE_DEFER aware regulator: of: fix suspend-min/max-voltage parsing
2019-10-23Merge tag 'sunxi-fixes-for-5.4-1' of ↵Olof Johansson1-6/+3
https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into arm/fixes A number of fixes for this release, but mostly: - A fixup for the A10 CSI DT binding merged during the 5.4-rc1 window - A fix for a dt-binding error - Addition of phy regulator delays - The PMU on the A64 was found to be non-functional, so we've dropped it for now * tag 'sunxi-fixes-for-5.4-1' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux: ARM: dts: sun7i: Drop the module clock from the device tree dt-bindings: media: sun4i-csi: Drop the module clock media: dt-bindings: Fix building error for dt_binding_check arm64: dts: allwinner: a64: sopine-baseboard: Add PHY regulator delay arm64: dts: allwinner: a64: Drop PMU node arm64: dts: allwinner: a64: pine64-plus: Add PHY regulator delay Link: https://lore.kernel.org/r/80085a57-c40f-4bed-a9c3-19858d87564e.lettre@localhost Signed-off-by: Olof Johansson <olof@lixom.net>
2019-10-22Merge tag 'pinctrl-v5.4-2' of ↵Linus Torvalds1-44/+42
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control fixes from Linus Walleij: "Here is a bunch of pin control fixes. I was lagging behind on this one, some fixes should have come in earlier, sorry about that. Anyways here it is, pretty straight-forward fixes, the Strago fix stand out as something serious affecting a lot of machines. Summary: - Handle multiple instances of Intel chips without complaining. - Restore the Intel Strago DMI workaround - Make the Armada 37xx handle pins over 32 - Fix the polarity of the LED group on Armada 37xx - Fix an off-by-one bug in the NS2 driver - Fix error path for iproc's platform_get_irq() - Fix error path on the STMFX driver - Fix a typo in the Berlin AS370 driver - Fix up misc errors in the Aspeed 2600 BMC support - Fix a stray SPDX tag" * tag 'pinctrl-v5.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: pinctrl: aspeed-g6: Rename SD3 to EMMC and rework pin groups pinctrl: aspeed-g6: Fix UART13 group pinmux pinctrl: aspeed-g6: Make SIG_DESC_CLEAR() behave intuitively pinctrl: aspeed-g6: Fix I3C3/I3C4 pinmux configuration pinctrl: aspeed-g6: Fix I2C14 SDA description pinctrl: aspeed-g6: Sort pins for sanity dt-bindings: pinctrl: aspeed-g6: Rework SD3 function and groups pinctrl: berlin: as370: fix a typo s/spififib/spdifib pinctrl: armada-37xx: swap polarity on LED group pinctrl: stmfx: fix null pointer on remove pinctrl: iproc: allow for error from platform_get_irq() pinctrl: ns2: Fix off by one bugs in ns2_pinmux_enable() pinctrl: bcm-iproc: Use SPDX header pinctrl: armada-37xx: fix control of pins 32 and up pinctrl: cherryview: restore Strago DMI workaround for all versions pinctrl: intel: Allocate IRQ chip dynamic
2019-10-20Merge branch 'irq-urgent-for-linus' of ↵Linus Torvalds1-2/+5
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull irq fixes from Thomas Gleixner: "A small set of irq chip driver fixes and updates: - Update the SIFIVE PLIC interrupt driver to use the fasteoi handler to address the shortcomings of the existing flow handling which was prone to lose interrupts - Use the proper limit for GIC interrupt line numbers - Add retrigger support for the recently merged Anapurna Labs Fabric interrupt controller to make it complete - Enable the ATMEL AIC5 interrupt controller driver on the new SAM9X60 SoC" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/sifive-plic: Switch to fasteoi flow irqchip/gic-v3: Fix GIC_LINE_NR accessor irqchip/atmel-aic5: Add support for sam9x60 irqchip irqchip/al-fic: Add support for irq retrigger
2019-10-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds2-19/+21
Pull networking fixes from David Miller: "I was battling a cold after some recent trips, so quite a bit piled up meanwhile, sorry about that. Highlights: 1) Fix fd leak in various bpf selftests, from Brian Vazquez. 2) Fix crash in xsk when device doesn't support some methods, from Magnus Karlsson. 3) Fix various leaks and use-after-free in rxrpc, from David Howells. 4) Fix several SKB leaks due to confusion of who owns an SKB and who should release it in the llc code. From Eric Biggers. 5) Kill a bunc of KCSAN warnings in TCP, from Eric Dumazet. 6) Jumbo packets don't work after resume on r8169, as the BIOS resets the chip into non-jumbo mode during suspend. From Heiner Kallweit. 7) Corrupt L2 header during MPLS push, from Davide Caratti. 8) Prevent possible infinite loop in tc_ctl_action, from Eric Dumazet. 9) Get register bits right in bcmgenet driver, based upon chip version. From Florian Fainelli. 10) Fix mutex problems in microchip DSA driver, from Marek Vasut. 11) Cure race between route lookup and invalidation in ipv4, from Wei Wang. 12) Fix performance regression due to false sharing in 'net' structure, from Eric Dumazet" * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (145 commits) net: reorder 'struct net' fields to avoid false sharing net: dsa: fix switch tree list net: ethernet: dwmac-sun8i: show message only when switching to promisc net: aquantia: add an error handling in aq_nic_set_multicast_list net: netem: correct the parent's backlog when corrupted packet was dropped net: netem: fix error path for corrupted GSO frames macb: propagate errors when getting optional clocks xen/netback: fix error path of xenvif_connect_data() net: hns3: fix mis-counting IRQ vector numbers issue net: usb: lan78xx: Connect PHY before registering MAC vsock/virtio: discard packets if credit is not respected vsock/virtio: send a credit update when buffer size is changed mlxsw: spectrum_trap: Push Ethernet header before reporting trap net: ensure correct skb->tstamp in various fragmenters net: bcmgenet: reset 40nm EPHY on energy detect net: bcmgenet: soft reset 40nm EPHYs before MAC init net: phy: bcm7xxx: define soft_reset for 40nm EPHY net: bcmgenet: don't set phydev->link from MAC net: Update address for MediaTek ethernet driver in MAINTAINERS ipv4: fix race condition between route lookup and invalidation ...
2019-10-18Merge tag 'arm64-fixes' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 fixes from Will Deacon: "The main thing here is a long-awaited workaround for a CPU erratum on ThunderX2 which we have developed in conjunction with engineers from Cavium/Marvell. At the moment, the workaround is unconditionally enabled for affected CPUs at runtime but we may add a command-line option to disable it in future if performance numbers show up indicating a significant cost for real workloads. Summary: - Work around Cavium/Marvell ThunderX2 erratum #219 - Fix regression in mlock() ABI caused by sign-extension of TTBR1 addresses - More fixes to the spurious kernel fault detection logic - Fix pathological preemption race when enabling some CPU features at boot - Drop broken kcore macros in favour of generic implementations - Fix userspace view of ID_AA64ZFR0_EL1 when SVE is disabled - Avoid NULL dereference on allocation failure during hibernation" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: tags: Preserve tags for addresses translated via TTBR1 arm64: mm: fix inverted PAR_EL1.F check arm64: sysreg: fix incorrect definition of SYS_PAR_EL1_F arm64: entry.S: Do not preempt from IRQ before all cpufeatures are enabled arm64: hibernate: check pgd table allocation arm64: cpufeature: Treat ID_AA64ZFR0_EL1 as RAZ when SVE is not enabled arm64: Fix kcore macros after 52-bit virtual addressing fallout arm64: Allow CAVIUM_TX2_ERRATUM_219 to be selected arm64: Avoid Cavium TX2 erratum 219 when switching TTBR arm64: Enable workaround for Cavium TX2 erratum 219 when running SMT arm64: KVM: Trap VM ops when ARM64_WORKAROUND_CAVIUM_TX2_219_TVM is set
2019-10-17Merge branch 'errata/tx2-219' into for-next/fixesWill Deacon10-19/+22
Workaround for Cavium/Marvell ThunderX2 erratum #219. * errata/tx2-219: arm64: Allow CAVIUM_TX2_ERRATUM_219 to be selected arm64: Avoid Cavium TX2 erratum 219 when switching TTBR arm64: Enable workaround for Cavium TX2 erratum 219 when running SMT arm64: KVM: Trap VM ops when ARM64_WORKAROUND_CAVIUM_TX2_219_TVM is set
2019-10-17docs: driver-model: Add documentation for sync_stateSaravana Kannan1-0/+43
The sync_state() driver callback was added recently, but the documentation was missing. Adding it now. Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20191011191521.179614-4-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-16dt-bindings: pinctrl: aspeed-g6: Rework SD3 function and groupsAndrew Jeffery1-44/+42
Rename SD3 functions and groups to EMMC to better reflect their intended use before the binding escapes too far into the wild. Also clean up the SD3 pin groups to eliminate some silliness that slipped through the cracks (SD3DAT[4-7]) by unifying them into three new groups: EMMCG1, EMMCG4 and EMMCG8 for 1, 4 and 8-bit data buses respectively. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Link: https://lore.kernel.org/r/20191008044153.12734-2-andrew@aj.id.au Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2019-10-16debugfs: remove return value of debugfs_create_x64()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_x64(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191011132931.1186197-8-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-16debugfs: remove return value of debugfs_create_x32()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_x32(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191011132931.1186197-7-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-16debugfs: remove return value of debugfs_create_x16()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_x16(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191011132931.1186197-6-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-15mm, page_owner: decouple freeing stack trace from debug_pageallocVlastimil Babka1-0/+3
Commit 8974558f49a6 ("mm, page_owner, debug_pagealloc: save and dump freeing stack trace") enhanced page_owner to also store freeing stack trace, when debug_pagealloc is also enabled. KASAN would also like to do this [1] to improve error reports to debug e.g. UAF issues. Kirill has suggested that the freeing stack trace saving should be also possible to be enabled separately from KASAN or debug_pagealloc, i.e. with an extra boot option. Qian argued that we have enough options already, and avoiding the extra overhead is not worth the complications in the case of a debugging option. Kirill noted that the extra stack handle in struct page_owner requires 0.1% of memory. This patch therefore enables free stack saving whenever page_owner is enabled, regardless of whether debug_pagealloc or KASAN is also enabled. KASAN kernels booted with page_owner=on will thus benefit from the improved error reports. [1] https://bugzilla.kernel.org/show_bug.cgi?id=203967 [vbabka@suse.cz: v3] Link: http://lkml.kernel.org/r/20191007091808.7096-3-vbabka@suse.cz Link: http://lkml.kernel.org/r/20190930122916.14969-3-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Qian Cai <cai@lca.pw> Suggested-by: Dmitry Vyukov <dvyukov@google.com> Suggested-by: Walter Wu <walter-zh.wu@mediatek.com> Suggested-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Suggested-by: Qian Cai <cai@lca.pw> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-14Merge tag 'irqchip-fixes-5.4-1' of ↵Thomas Gleixner1-2/+5
git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent Pull irqchip fixes from Marc Zyngier: - Add retrigger support to Amazon's al-fic driver - Add SAM9X60 support to Atmel's AIC5 irqchip - Fix GICv3 maximum interrupt calculation - Convert SiFive's PLIC to the fasteoi IRQ flow
2019-10-14debugfs: remove return value of debugfs_create_size_t()Greg Kroah-Hartman1-3/+2
No one checks the return value of debugfs_create_size_t(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20191011132931.1186197-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-14debugfs: remove return value of debugfs_create_u64()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_u64(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20191011132931.1186197-3-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-14debugfs: remove return value of debugfs_create_u16()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_u16(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20191011132931.1186197-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-14debugfs: remove return value of debugfs_create_u8()Greg Kroah-Hartman1-2/+2
No one checks the return value of debugfs_create_u8(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20191011132931.1186197-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-13Merge tag 'hwmon-for-v5.4-rc3' of ↵Linus Torvalds3-2/+19
git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging Pull hwmon fixes from Guenter Roeck: - Update/fix inspur-ipsps1 and k10temp Documentation - Fix nct7904 driver - Fix HWMON_P_MIN_ALARM mask in hwmon core * tag 'hwmon-for-v5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: hwmon: docs: Extend inspur-ipsps1 title underline hwmon: (nct7904) Add array fan_alarm and vsen_alarm to store the alarms in nct7904_data struct. docs: hwmon: Include 'inspur-ipsps1.rst' into docs hwmon: Fix HWMON_P_MIN_ALARM mask hwmon: (k10temp) Update documentation and add temp2_input info hwmon: (nct7904) Fix the incorrect value of vsen_mask in nct7904_data struct
2019-10-13Merge tag 'tty-5.4-rc3' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty/serial driver fixes from Greg KH: "Here are some small tty and serial driver fixes for 5.4-rc3 that resolve a number of reported issues and regressions. None of these are huge, full details are in the shortlog. There's also a MAINTAINERS update that I think you might have already taken in your tree already, but git should handle that merge easily. All have been in linux-next with no reported issues" * tag 'tty-5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: MAINTAINERS: kgdb: Add myself as a reviewer for kgdb/kdb tty: serial: imx: Use platform_get_irq_optional() for optional IRQs serial: fix kernel-doc warning in comments serial: 8250_omap: Fix gpio check for auto RTS/CTS serial: mctrl_gpio: Check for NULL pointer tty: serial: fsl_lpuart: Fix lpuart_flush_buffer() tty: serial: Fix PORT_LINFLEXUART definition tty: n_hdlc: fix build on SPARC serial: uartps: Fix uartps_major handling serial: uartlite: fix exit path null pointer tty: serial: linflexuart: Fix magic SysRq handling serial: sh-sci: Use platform_get_irq_optional() for optional interrupts dt-bindings: serial: sh-sci: Document r8a774b1 bindings serial/sifive: select SERIAL_EARLYCON tty: serial: rda: Fix the link time qualifier of 'rda_uart_exit()' tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
2019-10-13Merge tag 'usb-5.4-rc3' of ↵Linus Torvalds9-120/+26
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb Pull USB fixes from Greg KH: "Here are a lot of small USB driver fixes for 5.4-rc3. syzbot has stepped up its testing of the USB driver stack, now able to trigger fun race conditions between disconnect and probe functions. Because of that we have a lot of fixes in here from Johan and others fixing these reported issues that have been around since almost all time. We also are just deleting the rio500 driver, making all of the syzbot bugs found in it moot as it turns out no one has been using it for years as there is a userspace version that is being used instead. There are also a number of other small fixes in here, all resolving reported issues or regressions. All have been in linux-next without any reported issues" * tag 'usb-5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (65 commits) USB: yurex: fix NULL-derefs on disconnect USB: iowarrior: use pr_err() USB: iowarrior: drop redundant iowarrior mutex USB: iowarrior: drop redundant disconnect mutex USB: iowarrior: fix use-after-free after driver unbind USB: iowarrior: fix use-after-free on release USB: iowarrior: fix use-after-free on disconnect USB: chaoskey: fix use-after-free on release USB: adutux: fix use-after-free on release USB: ldusb: fix NULL-derefs on driver unbind USB: legousbtower: fix use-after-free on release usb: cdns3: Fix for incorrect DMA mask. usb: cdns3: fix cdns3_core_init_role() usb: cdns3: gadget: Fix full-speed mode USB: usb-skeleton: drop redundant in-urb check USB: usb-skeleton: fix use-after-free after driver unbind USB: usb-skeleton: fix NULL-deref on disconnect usb:cdns3: Fix for CV CH9 running with g_zero driver. usb: dwc3: Remove dev_err() on platform_get_irq() failure usb: dwc3: Switch to platform_get_irq_byname_optional() ...
2019-10-13Merge tag 'for-linus-5.4-rc3-tag' of ↵Linus Torvalds1-0/+4
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull xen fixes from Juergen Gross: - correct panic handling when running as a Xen guest - cleanup the Xen grant driver to remove printing a pointer being always NULL - remove a soon to be wrong call of of_dma_configure() * tag 'for-linus-5.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: Stop abusing DT of_dma_configure API xen/grant-table: remove unnecessary printing x86/xen: Return from panic notifier
2019-10-11Merge tag 'modules-for-v5.4-rc3' of ↵Linus Torvalds2-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux Pull module fixes from Jessica Yu: "Code cleanups and kbuild/namespace related fixups from Masahiro. Most importantly, it fixes a namespace-related modpost issue for external module builds - Fix broken external module builds due to a modpost bug in read_dump(), where the namespace was not being strdup'd and sym->namespace would be set to bogus data. - Various namespace-related kbuild fixes and cleanups thanks to Masahiro Yamada" * tag 'modules-for-v5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux: doc: move namespaces.rst from kbuild/ to core-api/ nsdeps: make generated patches independent of locale nsdeps: fix hashbang of scripts/nsdeps kbuild: fix build error of 'make nsdeps' in clean tree module: rename __kstrtab_ns_* to __kstrtabns_* to avoid symbol conflict modpost: fix broken sym->namespace for external module builds module: swap the order of symbol.namespace scripts: add_namespace: Fix coccicheck failed
2019-10-11Documentation/process: Add fallthrough pseudo-keywordJoe Perches2-11/+24
Describe the fallthrough pseudo-keyword. Convert the coding-style.rst example to the keyword style. Add description and links to deprecated.rst. Miguel Ojeda comments on the eventual [[fallthrough]] syntax: "Note that C17/C18 does not have [[fallthrough]]. C++17 introduced it, as it is mentioned above. I would keep the __attribute__((fallthrough)) -> [[fallthrough]] change you did, though, since that is indeed the standard syntax (given the paragraph references C++17). I was told by Aaron Ballman (who is proposing them for C) that it is more or less likely that it becomes standardized in C2x. However, it is still not added to the draft (other attributes are already, though). See N2268 and N2269: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2268.pdf (fallthrough) http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2269.pdf (attributes in general)" Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-11net: update net_dim documentation after renameJacob Keller1-18/+18
Commit 8960b38932be ("linux/dim: Rename externally used net_dim members") renamed the net_dim API, removing the "net_" prefix from the structures and functions. The patch didn't update the net_dim.txt documentation file. Fix the documentation so that its examples match the current code. Fixes: 8960b38932be ("linux/dim: Rename externally used net_dim members", 2019-06-25) Fixes: c002bd529d71 ("linux/dim: Rename externally exposed macros", 2019-06-25) Fixes: 4f75da3666c0 ("linux/dim: Move implementation to .c files") Cc: Tal Gilboa <talgi@mellanox.com> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
2019-10-09Merge tag 'arm64-fixes' of ↵Linus Torvalds1-1/+8
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 fixes from Will Deacon: "A larger-than-usual batch of arm64 fixes for -rc3. The bulk of the fixes are dealing with a bunch of issues with the build system from the compat vDSO, which unfortunately led to some significant Makefile rework to manage the horrible combinations of toolchains that we can end up needing to drive simultaneously. We came close to disabling the thing entirely, but Vincenzo was quick to spin up some patches and I ended up picking up most of the bits that were left [*]. Future work will look at disentangling the header files properly. Other than that, we have some important fixes all over, including one papering over the miscompilation fallout from forcing CONFIG_OPTIMIZE_INLINING=y, which I'm still unhappy about. Harumph. We've still got a couple of open issues, so I'm expecting to have some more fixes later this cycle. Summary: - Numerous fixes to the compat vDSO build system, especially when combining gcc and clang - Fix parsing of PAR_EL1 in spurious kernel fault detection - Partial workaround for Neoverse-N1 erratum #1542419 - Fix IRQ priority masking on entry from compat syscalls - Fix advertisment of FRINT HWCAP to userspace - Attempt to workaround inlining breakage with '__always_inline' - Fix accidental freeing of parent SVE state on fork() error path - Add some missing NULL pointer checks in instruction emulation init - Some formatting and comment fixes" [*] Will's final fixes were Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> but they were already in linux-next by then and he didn't rebase just to add those. * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (21 commits) arm64: armv8_deprecated: Checking return value for memory allocation arm64: Kconfig: Make CONFIG_COMPAT_VDSO a proper Kconfig option arm64: vdso32: Rename COMPATCC to CC_COMPAT arm64: vdso32: Pass '--target' option to clang via VDSO_CAFLAGS arm64: vdso32: Don't use KBUILD_CPPFLAGS unconditionally arm64: vdso32: Move definition of COMPATCC into vdso32/Makefile arm64: Default to building compat vDSO with clang when CONFIG_CC_IS_CLANG lib: vdso: Remove CROSS_COMPILE_COMPAT_VDSO arm64: vdso32: Remove jump label config option in Makefile arm64: vdso32: Detect binutils support for dmb ishld arm64: vdso: Remove stale files from old assembly implementation arm64: vdso32: Fix broken compat vDSO build warnings arm64: mm: fix spurious fault detection arm64: ftrace: Ensure synchronisation in PLT setup for Neoverse-N1 #1542419 arm64: Fix incorrect irqflag restore for priority masking for compat arm64: mm: avoid virt_to_phys(init_mm.pgd) arm64: cpufeature: Effectively expose FRINT capability to userspace arm64: Mark functions using explicit register variables as '__always_inline' docs: arm64: Fix indentation and doc formatting arm64/sve: Fix wrong free for task->thread.sve_state ...
2019-10-09Doc: networking/device_drivers/pensando: fix ionic.rst warningsRandy Dunlap1-1/+3
Fix documentation build warnings for Pensando ionic: Documentation/networking/device_drivers/pensando/ionic.rst:39: WARNING: Unexpected indentation. Documentation/networking/device_drivers/pensando/ionic.rst:43: WARNING: Unexpected indentation. Fixes: df69ba43217d ("ionic: Add basic framework for IONIC Network device driver") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Shannon Nelson <snelson@pensando.io> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
2019-10-08Merge tag 'linux-kselftest-5.4-rc3' of ↵Linus Torvalds1-0/+16
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest Pull Kselftest fixes from Shuah Khan: "Fixes for existing tests and the framework. Cristian Marussi's patches add the ability to skip targets (tests) and exclude tests that didn't build from run-list. These patches improve the Kselftest results. Ability to skip targets helps avoid running tests that aren't supported in certain environments. As an example, bpf tests from mainline aren't supported on stable kernels and have dependency on bleeding edge llvm. Being able to skip bpf on systems that can't meet this llvm dependency will be helpful. Kselftest can be built and installed from the main Makefile. This change help simplify Kselftest use-cases which addresses request from users. Kees Cook added per test timeout support to limit individual test run-time" * tag 'linux-kselftest-5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: selftests: watchdog: Add command line option to show watchdog_info selftests: watchdog: Validate optional file argument selftests/kselftest/runner.sh: Add 45 second timeout per test kselftest: exclude failed TARGETS from runlist kselftest: add capability to skip chosen TARGETS selftests: Add kselftest-all and kselftest-install targets
2019-10-08doc: move namespaces.rst from kbuild/ to core-api/Masahiro Yamada2-0/+1
We discussed a better location for this file, and agreed that core-api/ is a good fit. Rename it to symbol-namespaces.rst for disambiguation, and also add it to index.rst and MAINTAINERS. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Matthias Maennich <maennich@google.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
2019-10-08arm64: Allow CAVIUM_TX2_ERRATUM_219 to be selectedMarc Zyngier1-0/+2
Allow the user to select the workaround for TX2-219, and update the silicon-errata.rst file to reflect this. Cc: <stable@vger.kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
2019-10-08Merge branch 'akpm' (patches from Andrew)Linus Torvalds2-6/+18
Merge misc fixes from Andrew Morton: "The usual shower of hotfixes. Chris's memcg patches aren't actually fixes - they're mature but a few niggling review issues were late to arrive. The ocfs2 fixes are quite old - those took some time to get reviewer attention. Subsystems affected by this patch series: ocfs2, hotfixes, mm/memcg, mm/slab-generic" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two) mm, sl[ou]b: improve memory accounting mm, memcg: make scan aggression always exclude protection mm, memcg: make memory.emin the baseline for utilisation determination mm, memcg: proportional memory.{low,min} reclaim mm/vmpressure.c: fix a signedness bug in vmpressure_register_event() mm/page_alloc.c: fix a crash in free_pages_prepare() mm/z3fold.c: claim page in the beginning of free kernel/sysctl.c: do not override max_threads provided by userspace memcg: only record foreign writebacks with dirty pages when memcg is not disabled mm: fix -Wmissing-prototypes warnings writeback: fix use-after-free in finish_writeback_work() mm/memremap: drop unused SECTION_SIZE and SECTION_MASK panic: ensure preemption is disabled during panic() fs: ocfs2: fix a possible null-pointer dereference in ocfs2_info_scan_inode_alloc() fs: ocfs2: fix a possible null-pointer dereference in ocfs2_write_end_nolock() fs: ocfs2: fix possible null-pointer dereferences in ocfs2_xa_prepare_entry() ocfs2: clear zero in unaligned direct IO
2019-10-08mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two)Vlastimil Babka1-0/+4
In most configurations, kmalloc() happens to return naturally aligned (i.e. aligned to the block size itself) blocks for power of two sizes. That means some kmalloc() users might unknowingly rely on that alignment, until stuff breaks when the kernel is built with e.g. CONFIG_SLUB_DEBUG or CONFIG_SLOB, and blocks stop being aligned. Then developers have to devise workaround such as own kmem caches with specified alignment [1], which is not always practical, as recently evidenced in [2]. The topic has been discussed at LSF/MM 2019 [3]. Adding a 'kmalloc_aligned()' variant would not help with code unknowingly relying on the implicit alignment. For slab implementations it would either require creating more kmalloc caches, or allocate a larger size and only give back part of it. That would be wasteful, especially with a generic alignment parameter (in contrast with a fixed alignment to size). Ideally we should provide to mm users what they need without difficult workarounds or own reimplementations, so let's make the kmalloc() alignment to size explicitly guaranteed for power-of-two sizes under all configurations. What this means for the three available allocators? * SLAB object layout happens to be mostly unchanged by the patch. The implicitly provided alignment could be compromised with CONFIG_DEBUG_SLAB due to redzoning, however SLAB disables redzoning for caches with alignment larger than unsigned long long. Practically on at least x86 this includes kmalloc caches as they use cache line alignment, which is larger than that. Still, this patch ensures alignment on all arches and cache sizes. * SLUB layout is also unchanged unless redzoning is enabled through CONFIG_SLUB_DEBUG and boot parameter for the particular kmalloc cache. With this patch, explicit alignment is guaranteed with redzoning as well. This will result in more memory being wasted, but that should be acceptable in a debugging scenario. * SLOB has no implicit alignment so this patch adds it explicitly for kmalloc(). The potential downside is increased fragmentation. While pathological allocation scenarios are certainly possible, in my testing, after booting a x86_64 kernel+userspace with virtme, around 16MB memory was consumed by slab pages both before and after the patch, with difference in the noise. [1] https://lore.kernel.org/linux-btrfs/c3157c8e8e0e7588312b40c853f65c02fe6c957a.1566399731.git.christophe.leroy@c-s.fr/ [2] https://lore.kernel.org/linux-fsdevel/20190225040904.5557-1-ming.lei@redhat.com/ [3] https://lwn.net/Articles/787740/ [akpm@linux-foundation.org: documentation fixlet, per Matthew] Link: http://lkml.kernel.org/r/20190826111627.7505-3-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: David Sterba <dsterba@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: "Darrick J . Wong" <darrick.wong@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-08mm, memcg: proportional memory.{low,min} reclaimChris Down1-6/+14
cgroup v2 introduces two memory protection thresholds: memory.low (best-effort) and memory.min (hard protection). While they generally do what they say on the tin, there is a limitation in their implementation that makes them difficult to use effectively: that cliff behaviour often manifests when they become eligible for reclaim. This patch implements more intuitive and usable behaviour, where we gradually mount more reclaim pressure as cgroups further and further exceed their protection thresholds. This cliff edge behaviour happens because we only choose whether or not to reclaim based on whether the memcg is within its protection limits (see the use of mem_cgroup_protected in shrink_node), but we don't vary our reclaim behaviour based on this information. Imagine the following timeline, with the numbers the lruvec size in this zone: 1. memory.low=1000000, memory.current=999999. 0 pages may be scanned. 2. memory.low=1000000, memory.current=1000000. 0 pages may be scanned. 3. memory.low=1000000, memory.current=1000001. 1000001* pages may be scanned. (?!) * Of course, we won't usually scan all available pages in the zone even without this patch because of scan control priority, over-reclaim protection, etc. However, as shown by the tests at the end, these techniques don't sufficiently throttle such an extreme change in input, so cliff-like behaviour isn't really averted by their existence alone. Here's an example of how this plays out in practice. At Facebook, we are trying to protect various workloads from "system" software, like configuration management tools, metric collectors, etc (see this[0] case study). In order to find a suitable memory.low value, we start by determining the expected memory range within which the workload will be comfortable operating. This isn't an exact science -- memory usage deemed "comfortable" will vary over time due to user behaviour, differences in composition of work, etc, etc. As such we need to ballpark memory.low, but doing this is currently problematic: 1. If we end up setting it too low for the workload, it won't have *any* effect (see discussion above). The group will receive the full weight of reclaim and won't have any priority while competing with the less important system software, as if we had no memory.low configured at all. 2. Because of this behaviour, we end up erring on the side of setting it too high, such that the comfort range is reliably covered. However, protected memory is completely unavailable to the rest of the system, so we might cause undue memory and IO pressure there when we *know* we have some elasticity in the workload. 3. Even if we get the value totally right, smack in the middle of the comfort zone, we get extreme jumps between no pressure and full pressure that cause unpredictable pressure spikes in the workload due to the current binary reclaim behaviour. With this patch, we can set it to our ballpark estimation without too much worry. Any undesirable behaviour, such as too much or too little reclaim pressure on the workload or system will be proportional to how far our estimation is off. This means we can set memory.low much more conservatively and thus waste less resources *without* the risk of the workload falling off a cliff if we overshoot. As a more abstract technical description, this unintuitive behaviour results in having to give high-priority workloads a large protection buffer on top of their expected usage to function reliably, as otherwise we have abrupt periods of dramatically increased memory pressure which hamper performance. Having to set these thresholds so high wastes resources and generally works against the principle of work conservation. In addition, having proportional memory reclaim behaviour has other benefits. Most notably, before this patch it's basically mandatory to set memory.low to a higher than desirable value because otherwise as soon as you exceed memory.low, all protection is lost, and all pages are eligible to scan again. By contrast, having a gradual ramp in reclaim pressure means that you now still get some protection when thresholds are exceeded, which means that one can now be more comfortable setting memory.low to lower values without worrying that all protection will be lost. This is important because workingset size is really hard to know exactly, especially with variable workloads, so at least getting *some* protection if your workingset size grows larger than you expect increases user confidence in setting memory.low without a huge buffer on top being needed. Thanks a lot to Johannes Weiner and Tejun Heo for their advice and assistance in thinking about how to make this work better. In testing these changes, I intended to verify that: 1. Changes in page scanning become gradual and proportional instead of binary. To test this, I experimented stepping further and further down memory.low protection on a workload that floats around 19G workingset when under memory.low protection, watching page scan rates for the workload cgroup: +------------+-----------------+--------------------+--------------+ | memory.low | test (pgscan/s) | control (pgscan/s) | % of control | +------------+-----------------+--------------------+--------------+ | 21G | 0 | 0 | N/A | | 17G | 867 | 3799 | 23% | | 12G | 1203 | 3543 | 34% | | 8G | 2534 | 3979 | 64% | | 4G | 3980 | 4147 | 96% | | 0 | 3799 | 3980 | 95% | +------------+-----------------+--------------------+--------------+ As you can see, the test kernel (with a kernel containing this patch) ramps up page scanning significantly more gradually than the control kernel (without this patch). 2. More gradual ramp up in reclaim aggression doesn't result in premature OOMs. To test this, I wrote a script that slowly increments the number of pages held by stress(1)'s --vm-keep mode until a production system entered severe overall memory contention. This script runs in a highly protected slice taking up the majority of available system memory. Watching vmstat revealed that page scanning continued essentially nominally between test and control, without causing forward reclaim progress to become arrested. [0]: https://facebookmicrosites.github.io/cgroup2/docs/overview.html#case-study-the-fbtax2-project [akpm@linux-foundation.org: reflow block comments to fit in 80 cols] [chris@chrisdown.name: handle cgroup_disable=memory when getting memcg protection] Link: http://lkml.kernel.org/r/20190201045711.GA18302@chrisdown.name Link: http://lkml.kernel.org/r/20190124014455.GA6396@chrisdown.name Signed-off-by: Chris Down <chris@chrisdown.name> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Tejun Heo <tj@kernel.org> Cc: Dennis Zhou <dennis@kernel.org> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-08x86/xen: Return from panic notifierBoris Ostrovsky1-0/+4
Currently execution of panic() continues until Xen's panic notifier (xen_panic_event()) is called at which point we make a hypercall that never returns. This means that any notifier that is supposed to be called later as well as significant part of panic() code (such as pstore writes from kmsg_dump()) is never executed. There is no reason for xen_panic_event() to be this last point in execution since panic()'s emergency_restart() will call into xen_emergency_restart() from where we can perform our hypercall. Nevertheless, we will provide xen_legacy_crash boot option that will preserve original behavior during crash. This option could be used, for example, if running kernel dumper (which happens after panic notifiers) is undesirable. Reported-by: James Dingwall <james@dingwall.me.uk> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Juergen Gross <jgross@suse.com>
2019-10-07hwmon: docs: Extend inspur-ipsps1 title underlineAdam Zerella1-1/+1
Sphinx is generating a build warning as the title underline of this file is too short. Signed-off-by: Adam Zerella <adam.zerella@gmail.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-10-07dt-bindings: media: sun4i-csi: Drop the module clockMaxime Ripard1-5/+2
It turns out that what was thought to be the module clock was actually the clock meant to be used by the sensor, and isn't playing any role with the CSI controller itself. Let's drop that clock from our binding. Fixes: c5e8f4ccd775 ("media: dt-bindings: media: Add Allwinner A10 CSI binding") Reported-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <mripard@kernel.org>
2019-10-07media: dt-bindings: Fix building error for dt_binding_checkPragnesh Patel1-1/+1
$id doesn't match the actual filename, so update the $id Fixes: c5e8f4ccd7750 ("media: dt-bindings: media: Add Allwinner A10 CSI binding") Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com> Signed-off-by: Maxime Ripard <mripard@kernel.org>
2019-10-05Merge tag 'kbuild-fixes-v5.4' of ↵Linus Torvalds3-12/+13
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild fixes from Masahiro Yamada: - remove unneeded ar-option and KBUILD_ARFLAGS - remove long-deprecated SUBDIRS - fix modpost to suppress false-positive warnings for UML builds - fix namespace.pl to handle relative paths to ${objtree}, ${srctree} - make setlocalversion work for /bin/sh - make header archive reproducible - fix some Makefiles and documents * tag 'kbuild-fixes-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kheaders: make headers archive reproducible kbuild: update compile-test header list for v5.4-rc2 kbuild: two minor updates for Documentation/kbuild/modules.rst scripts/setlocalversion: clear local variable to make it work for sh namespace: fix namespace.pl script to support relative paths video/logo: do not generate unneeded logo C files video/logo: remove unneeded *.o pattern from clean-files integrity: remove pointless subdir-$(CONFIG_...) integrity: remove unneeded, broken attempt to add -fshort-wchar modpost: fix static EXPORT_SYMBOL warnings for UML build kbuild: correct formatting of header in kbuild module docs kbuild: remove SUBDIRS support kbuild: remove ar-option and KBUILD_ARFLAGS