- 17 Jul, 2019 40 commits
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git://github.com/awilliam/linux-vfioLinus Torvalds authored
Pull VFIO updates from Alex Williamson: - Static symbol cleanup in mdev samples (Kefeng Wang) - Use vma help in nvlink code (Peng Hao) - Remove unused code in mbochs sample (YueHaibing) - Send uevents around mdev registration (Alex Williamson) * tag 'vfio-v5.3-rc1' of git://github.com/awilliam/linux-vfio: mdev: Send uevents around parent device registration sample/mdev/mbochs: remove set but not used variable 'mdev_state' vfio: vfio_pci_nvlink2: use a vma helper function vfio-mdev/samples: make some symbols static
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linuxLinus Torvalds authored
Pull clk updates from Stephen Boyd: "This round of clk driver and framework updates is heavy on the driver update side. The two main highlights in the core framework are the addition of an bulk clk_get API that handles optional clks and an extra debugfs file that tells the developer about the current parent of a clk. The driver updates are dominated by i.MX in the diffstat, but that is mostly because that SoC has started converting to the clk_hw style of clk registration. The next big update is in the Amlogic meson clk driver that gained some support for audio, cpu, and temperature clks while fixing some PLL issues. Finally, the biggest thing that stands out is the conversion of a large part of the Allwinner sunxi-ng driver to the new clk parent scheme that uses less strings and more pointer comparisons to match clk parents and children up. In general, it looks like we have a lot of little fixes and tweaks here and there to clk data along with the normal addition of a handful of new drivers and a couple new core framework features. Core: - Add a 'clk_parent' file in clk debugfs - Add a clk_bulk_get_optional() API (with devm too) New Drivers: - Support gated clk controller on MIPS based BCM63XX SoCs - Support SiLabs Si5341 and Si5340 chips - Support for CPU clks on Raspberry Pi devices - Audsys clock driver for MediaTek MT8516 SoCs Updates: - Convert a large portion of the Allwinner sunxi-ng driver to new clk parent scheme - Small frequency support for SiLabs Si544 chips - Slow clk support for AT91 SAM9X60 SoCs - Remove dead code in various clk drivers (-Wunused) - Support for Marvell 98DX1135 SoCs - Get duty cycle of generic pwm clks - Improvement in mmc phase calculation and cleanup of some rate defintions - Switch i.MX6 and i.MX7 clock drivers to clk_hw based APIs - Add GPIO, SNVS and GIC clocks for i.MX8 drivers - Mark imx6sx/ul/ull/sll MMDC_P1_IPG and imx8mm DRAM_APB as critical clock - Correct imx7ulp nic1_bus_clk and imx8mm audio_pll2_clk clock setting - Add clks for new Exynos5422 Dynamic Memory Controller driver - Clock definition for Exynos4412 Mali - Add CMM (Color Management Module) clocks on Renesas R-Car H3, M3-N, E3, and D3 - Add TPU (Timer Pulse Unit / PWM) clocks on Renesas RZ/G2M - Support for 32 bit clock IDs in TI's sci-clks for J721e SoCs - TI clock probing done from DT by default instead of firmware - Fix Amlogic Meson mpll fractional part and spread sprectrum issues - Add Amlogic meson8 audio clocks - Add Amlogic g12a temperature sensors clocks - Add Amlogic g12a and g12b cpu clocks - Add TPU (Timer Pulse Unit / PWM) clocks on Renesas R-Car H3, M3-W, and M3-N - Add CMM (Color Management Module) clocks on Renesas R-Car M3-W - Add Clock Domain support on Renesas RZ/N1" * tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (190 commits) clk: consoldiate the __clk_get_hw() declarations clk: sprd: Add check for return value of sprd_clk_regmap_init() clk: lochnagar: Update DT binding doc to include the primary SPDIF MCLK clk: Add Si5341/Si5340 driver dt-bindings: clock: Add silabs,si5341 clk: clk-si544: Implement small frequency change support clk: add BCM63XX gated clock controller driver devicetree: document the BCM63XX gated clock bindings clk: at91: sckc: use dedicated functions to unregister clock clk: at91: sckc: improve error path for sama5d4 sck registration clk: at91: sckc: remove unnecessary line clk: at91: sckc: improve error path for sam9x5 sck register clk: at91: sckc: add support to free slow clock osclillator clk: at91: sckc: add support to free slow rc oscillator clk: at91: sckc: add support to free slow oscillator clk: rockchip: export HDMIPHY clock on rk3228 clk: rockchip: add watchdog pclk on rk3328 clk: rockchip: add clock id for hdmi_phy special clock on rk3228 clk: rockchip: add clock id for watchdog pclk on rk3328 clk: at91: sckc: add support for SAM9X60 ...
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git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linuxLinus Torvalds authored
Pull RTC updates from Alexandre Belloni: "A quiet cycle this time. - ds1307: properly handle oscillator failure flags - imx-sc: alarm support - pcf2123: alarm support, correct offset handling - sun6i: add R40 support - simplify getting the adapter of an i2c client" * tag 'rtc-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (37 commits) rtc: wm831x: Add IRQF_ONESHOT flag rtc: stm32: remove one condition check in stm32_rtc_set_alarm() rtc: pcf2123: Fix build error rtc: interface: Change type of 'count' from int to u64 rtc: pcf8563: Clear event flags and disable interrupts before requesting irq rtc: pcf8563: Fix interrupt trigger method rtc: pcf2123: fix negative offset rounding rtc: pcf2123: add alarm support rtc: pcf2123: use %ptR rtc: pcf2123: port to regmap rtc: pcf2123: remove sysfs register view rtc: rx8025: simplify getting the adapter of a client rtc: rx8010: simplify getting the adapter of a client rtc: rv8803: simplify getting the adapter of a client rtc: m41t80: simplify getting the adapter of a client rtc: fm3130: simplify getting the adapter of a client rtc: tegra: Drop MODULE_ALIAS rtc: sun6i: Add R40 compatible dt-bindings: rtc: sun6i: Add the R40 RTC compatible dt-bindings: rtc: Convert Allwinner A31 RTC to a schema ...
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git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds authored
Pull dmaengine updates from Vinod Koul: - Add support in dmaengine core to do device node checks for DT devices and update bunch of drivers to use that and remove open coding from drivers - New driver/driver support for new hardware, namely: - MediaTek UART APDMA - Freescale i.mx7ulp edma2 - Synopsys eDMA IP core version 0 - Allwinner H6 DMA - Updates to axi-dma and support for interleaved cyclic transfers - Greg's debugfs return value check removals on drivers - Updates to stm32-dma, hsu, dw, pl330, tegra drivers * tag 'dmaengine-5.3-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (68 commits) dmaengine: Revert "dmaengine: fsl-edma: add i.mx7ulp edma2 version support" dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback Documentation: dmaengine: clean up description of dmatest usage dmaengine: tegra210-adma: remove PM_CLK dependency dmaengine: fsl-edma: add i.mx7ulp edma2 version support dt-bindings: dma: fsl-edma: add new i.mx7ulp-edma dmaengine: fsl-edma-common: version check for v2 instead dmaengine: fsl-edma-common: move dmamux register to another single function dmaengine: fsl-edma: add drvdata for fsl-edma dmaengine: Revert "dmaengine: fsl-edma: support little endian for edma driver" dmaengine: rcar-dmac: Reject zero-length slave DMA requests dmaengine: dw: Enable iDMA 32-bit on Intel Elkhart Lake dmaengine: dw-edma: fix semicolon.cocci warnings dmaengine: sh: usb-dmac: Use [] to denote a flexible array member dmaengine: dmatest: timeout value of -1 should specify infinite wait dmaengine: dw: Distinguish ->remove() between DW and iDMA 32-bit dmaengine: fsl-edma: support little endian for edma driver dmaengine: hsu: Revert "set HSU_CH_MTSR to memory width" dmagengine: pl330: add code to get reset property dt-bindings: pl330: document the optional resets property ... -
git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxLinus Torvalds authored
Pull MIPS updates from Paul Burton: "A light batch this time around but significant improvements for certain systems: - Removal of readq & writeq for MIPS32 kernels where they would simply BUG() anyway, allowing drivers or other code that #ifdefs on their presence to work properly. - Improvements for Ingenic JZ4740 systems, including support for the external memory controller & pinmuxing fixes for qi_lb60/NanoNote systems. - Improvements for Lantiq systems, in particular around SMP & IPIs. - DT updates for ralink/MediaTek MT7628a systems to probe & configure a bunch more devices. - Miscellaneous cleanups & build fixes" * tag 'mips_5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (30 commits) MIPS: fix some more fall through errors in arch/mips MIPS: perf events: handle switch statement falling through warnings mips/kprobes: Export kprobe_fault_handler() MAINTAINERS: Add myself as Ingenic SoCs maintainer MIPS: ralink: mt7628a.dtsi: Add watchdog controller DT node MIPS: ralink: mt7628a.dtsi: Add SPI controller DT node MIPS: ralink: mt7628a.dtsi: Add GPIO controller DT node MIPS: ralink: mt7628a.dtsi: Add pinctrl DT properties to the UART nodes MIPS: ralink: mt7628a.dtsi: Add pinmux DT node MIPS: ralink: mt7628a.dtsi: Add SPDX GPL-2.0 license identifier MIPS: lantiq: Add SMP support for lantiq interrupt controller MIPS: lantiq: Shorten register names, remove unused macros MIPS: lantiq: Fix bitfield masking MIPS: lantiq: Remove unused macros MIPS: lantiq: Fix attributes of of_device_id structure MIPS: lantiq: Change variables to the same type as the source MIPS: lantiq: Move macro directly to iomem function mips: Remove q-accessors from non-64bit platforms FDDI: defza: Include linux/io-64-nonatomic-lo-hi.h MIPS: configs: Remove useless UEVENT_HELPER_PATH ... -
git://git.sourceforge.jp/gitroot/uclinux-h8/linuxLinus Torvalds authored
Pull h8300 update from Yoshinori Sato: "Remove unused barrier defines" * tag 'h8300-for-linus-20190617' of git://git.sourceforge.jp/gitroot/uclinux-h8/linux: H8300: remove unused barrier defines
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git://git.sourceforge.jp/gitroot/uclinux-h8/linuxLinus Torvalds authored
Pull SH updates from Yoshinori Sato. kprobe fix, defconfig updates and a SH Kconfig fix. * tag 'for-linus-20190617' of git://git.sourceforge.jp/gitroot/uclinux-h8/linux: arch/sh: Check for kprobe trap number before trying to handle a kprobe trap sh: configs: Remove useless UEVENT_HELPER_PATH Fix allyesconfig output.
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Linus Torvalds authored
Merge more updates from Andrew Morton: "VM: - z3fold fixes and enhancements by Henry Burns and Vitaly Wool - more accurate reclaimed slab caches calculations by Yafang Shao - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by Christoph Hellwig - !CONFIG_MMU fixes by Christoph Hellwig - new novmcoredd parameter to omit device dumps from vmcore, by Kairui Song - new test_meminit module for testing heap and pagealloc initialization, by Alexander Potapenko - ioremap improvements for huge mappings, by Anshuman Khandual - generalize kprobe page fault handling, by Anshuman Khandual - device-dax hotplug fixes and improvements, by Pavel Tatashin - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V - add pte_devmap() support for arm64, by Robin Murphy - unify locked_vm accounting with a helper, by Daniel Jordan - several misc fixes core/lib: - new typeof_member() macro including some users, by Alexey Dobriyan - make BIT() and GENMASK() available in asm, by Masahiro Yamada - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better code generation, by Alexey Dobriyan - rbtree code size optimizations, by Michel Lespinasse - convert struct pid count to refcount_t, by Joel Fernandes get_maintainer.pl: - add --no-moderated switch to skip moderated ML's, by Joe Perches misc: - ptrace PTRACE_GET_SYSCALL_INFO interface - coda updates - gdb scripts, various" [ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ] * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits) fs/select.c: use struct_size() in kmalloc() mm: add account_locked_vm utility function arm64: mm: implement pte_devmap support mm: introduce ARCH_HAS_PTE_DEVMAP mm: clean up is_device_*_page() definitions mm/mmap: move common defines to mman-common.h mm: move MAP_SYNC to asm-generic/mman-common.h device-dax: "Hotremove" persistent memory that is used like normal RAM mm/hotplug: make remove_memory() interface usable device-dax: fix memory and resource leak if hotplug fails include/linux/lz4.h: fix spelling and copy-paste errors in documentation ipc/mqueue.c: only perform resource calculation if user valid include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures scripts/gdb: add helpers to find and list devices scripts/gdb: add lx-genpd-summary command drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl kernel/pid.c: convert struct pid count to refcount_t drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining() select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR ... -
Gustavo A. R. Silva authored
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; size = sizeof(struct foo) + count * sizeof(struct boo); instance = kmalloc(size, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kmalloc(struct_size(instance, entry, count), GFP_KERNEL); Also, notice that variable size is unnecessary, hence it is removed. This code was detected with the help of Coccinelle. Link: http://lkml.kernel.org/r/20190604164226.GA13823@embeddedorSigned-off-by:Gustavo A. R. Silva <gustavo@embeddedor.com> Reviewed-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Daniel Jordan authored
locked_vm accounting is done roughly the same way in five places, so unify them in a helper. Include the helper's caller in the debug print to distinguish between callsites. Error codes stay the same, so user-visible behavior does too. The one exception is that the -EPERM case in tce_account_locked_vm is removed because Alexey has never seen it triggered. [daniel.m.jordan@oracle.com: v3] Link: http://lkml.kernel.org/r/20190529205019.20927-1-daniel.m.jordan@oracle.com [sfr@canb.auug.org.au: fix mm/util.c] Link: http://lkml.kernel.org/r/20190524175045.26897-1-daniel.m.jordan@oracle.comSigned-off-by:
Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Tested-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by:
Alex Williamson <alex.williamson@redhat.com> Cc: Alan Tull <atull@kernel.org> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Christoph Lameter <cl@linux.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Moritz Fischer <mdf@kernel.org> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Steve Sistare <steven.sistare@oracle.com> Cc: Wu Hao <hao.wu@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Signed-off-by:
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Robin Murphy authored
In order for things like get_user_pages() to work on ZONE_DEVICE memory, we need a software PTE bit to identify device-backed PFNs. Hook this up along with the relevant helpers to join in with ARCH_HAS_PTE_DEVMAP. [robin.murphy@arm.com: build fixes] Link: http://lkml.kernel.org/r/13026c4e64abc17133bbfa07d7731ec6691c0bcd.1559050949.git.robin.murphy@arm.com Link: http://lkml.kernel.org/r/817d92886fc3b33bcbf6e105ee83a74babb3a5aa.1558547956.git.robin.murphy@arm.comSigned-off-by:
Robin Murphy <robin.murphy@arm.com> Acked-by:
Will Deacon <will.deacon@arm.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
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Robin Murphy authored
ARCH_HAS_ZONE_DEVICE is somewhat meaningless in itself, and combined with the long-out-of-date comment can lead to the impression than an architecture may just enable it (since __add_pages() now "comprehends device memory" for itself) and expect things to work. In practice, however, ZONE_DEVICE users have little chance of functioning correctly without __HAVE_ARCH_PTE_DEVMAP, so let's clean that up the same way as ARCH_HAS_PTE_SPECIAL and make it the proper dependency so the real situation is clearer. Link: http://lkml.kernel.org/r/87554aa78478a02a63f2c4cf60a847279ae3eb3b.1558547956.git.robin.murphy@arm.comSigned-off-by:
Dan Williams <dan.j.williams@intel.com> Reviewed-by:
Ira Weiny <ira.weiny@intel.com> Acked-by:
Oliver O'Halloran <oohall@gmail.com> Reviewed-by:
Anshuman Khandual <anshuman.khandual@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by:
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Robin Murphy authored
Refactor is_device_{public,private}_page() with is_pci_p2pdma_page() to make them all consistent in depending on their respective config options even when CONFIG_DEV_PAGEMAP_OPS is enabled for other reasons. This allows a little more compile-time optimisation as well as the conceptual and cosmetic cleanup. Link: http://lkml.kernel.org/r/187c2ab27dea70635d375a61b2f2076d26c032b0.1558547956.git.robin.murphy@arm.comSigned-off-by:Jerome Glisse <jglisse@redhat.com> Reviewed-by:
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Aneesh Kumar K.V authored
Two architecture that use arch specific MMAP flags are powerpc and sparc. We still have few flag values common across them and other architectures. Consolidate this in mman-common.h. Also update the comment to indicate where to find HugeTLB specific reserved values Link: http://lkml.kernel.org/r/20190604090950.31417-1-aneesh.kumar@linux.ibm.comSigned-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by:
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Aneesh Kumar K.V authored
This enables support for synchronous DAX fault on powerpc The generic changes are added as part of b6fb293f ("mm: Define MAP_SYNC and VM_SYNC flags") Without this, mmap returns EOPNOTSUPP for MAP_SYNC with MAP_SHARED_VALIDATE Instead of adding MAP_SYNC with same value to arch/powerpc/include/uapi/asm/mman.h, I am moving the #define to asm-generic/mman-common.h. Two architectures using mman-common.h directly are sparc and powerpc. We should be able to consloidate more #defines to mman-common.h. That can be done as a separate patch. Link: http://lkml.kernel.org/r/20190528091120.13322-1-aneesh.kumar@linux.ibm.comSigned-off-by:
Jan Kara <jack@suse.cz> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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Pavel Tatashin authored
It is now allowed to use persistent memory like a regular RAM, but currently there is no way to remove this memory until machine is rebooted. This work expands the functionality to also allows hotremoving previously hotplugged persistent memory, and recover the device for use for other purposes. To hotremove persistent memory, the management software must first offline all memory blocks of dax region, and than unbind it from device-dax/kmem driver. So, operations should look like this: echo offline > /sys/devices/system/memory/memoryN/state ... echo dax0.0 > /sys/bus/dax/drivers/kmem/unbind Note: if unbind is done without offlining memory beforehand, it won't be possible to do dax0.0 hotremove, and dax's memory is going to be part of System RAM until reboot. Link: http://lkml.kernel.org/r/20190517215438.6487-4-pasha.tatashin@soleen.comSigned-off-by:
Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Cc: James Morris <jmorris@namei.org> Cc: Sasha Levin <sashal@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ross Zwisler <zwisler@kernel.org> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by:
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Pavel Tatashin authored
Presently the remove_memory() interface is inherently broken. It tries to remove memory but panics if some memory is not offline. The problem is that it is impossible to ensure that all memory blocks are offline as this function also takes lock_device_hotplug that is required to change memory state via sysfs. So, between calling this function and offlining all memory blocks there is always a window when lock_device_hotplug is released, and therefore, there is always a chance for a panic during this window. Make this interface to return an error if memory removal fails. This way it is safe to call this function without panicking machine, and also makes it symmetric to add_memory() which already returns an error. Link: http://lkml.kernel.org/r/20190517215438.6487-3-pasha.tatashin@soleen.comSigned-off-by:
Michal Hocko <mhocko@suse.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Borislav Petkov <bp@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: James Morris <jmorris@namei.org> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Ross Zwisler <zwisler@kernel.org> Cc: Sasha Levin <sashal@kernel.org> Cc: Takashi Iwai <tiwai@suse.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Signed-off-by:
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Pavel Tatashin authored
Patch series ""Hotremove" persistent memory", v6. Recently, adding a persistent memory to be used like a regular RAM was added to Linux. This work extends this functionality to also allow hot removing persistent memory. We (Microsoft) have an important use case for this functionality. The requirement is for physical machines with small amount of RAM (~8G) to be able to reboot in a very short period of time (<1s). Yet, there is a userland state that is expensive to recreate (~2G). The solution is to boot machines with 2G preserved for persistent memory. Copy the state, and hotadd the persistent memory so machine still has all 8G available for runtime. Before reboot, offline and hotremove device-dax 2G, copy the memory that is needed to be preserved to pmem0 device, and reboot. The series of operations look like this: 1. After boot restore /dev/pmem0 to ramdisk to be consumed by apps. and free ramdisk. 2. Convert raw pmem0 to devdax ndctl create-namespace --mode devdax --map mem -e namespace0.0 -f 3. Hotadd to System RAM echo dax0.0 > /sys/bus/dax/drivers/device_dax/unbind echo dax0.0 > /sys/bus/dax/drivers/kmem/new_id echo online_movable > /sys/devices/system/memoryXXX/state 4. Before reboot hotremove device-dax memory from System RAM echo offline > /sys/devices/system/memoryXXX/state echo dax0.0 > /sys/bus/dax/drivers/kmem/unbind 5. Create raw pmem0 device ndctl create-namespace --mode raw -e namespace0.0 -f 6. Copy the state that was stored by apps to ramdisk to pmem device 7. Do kexec reboot or reboot through firmware if firmware does not zero memory in pmem0 region (These machines have only regular volatile memory). So to have pmem0 device either memmap kernel parameter is used, or devices nodes in dtb are specified. This patch (of 3): When add_memory() fails, the resource and the memory should be freed. Link: http://lkml.kernel.org/r/20190517215438.6487-2-pasha.tatashin@soleen.com Fixes: c221c0b0 ("device-dax: "Hotplug" persistent memory for use like normal RAM") Signed-off-by:
Dave Hansen <dave.hansen@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Borislav Petkov <bp@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: James Morris <jmorris@namei.org> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Ross Zwisler <zwisler@kernel.org> Cc: Sasha Levin <sashal@kernel.org> Cc: Takashi Iwai <tiwai@suse.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Signed-off-by:
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Tom Levy authored
Fix a few spelling and grammar errors, and two places where fast/safe in the documentation did not match the function. Link: http://lkml.kernel.org/r/20190321014452.13297-1-tomlevy93@gmail.comSigned-off-by:
Tom Levy <tomlevy93@gmail.com> Reviewed-by:
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Kees Cook authored
Andreas Christoforou reported: UBSAN: Undefined behaviour in ipc/mqueue.c:414:49 signed integer overflow: 9 * 2305843009213693951 cannot be represented in type 'long int' ... Call Trace: mqueue_evict_inode+0x8e7/0xa10 ipc/mqueue.c:414 evict+0x472/0x8c0 fs/inode.c:558 iput_final fs/inode.c:1547 [inline] iput+0x51d/0x8c0 fs/inode.c:1573 mqueue_get_inode+0x8eb/0x1070 ipc/mqueue.c:320 mqueue_create_attr+0x198/0x440 ipc/mqueue.c:459 vfs_mkobj+0x39e/0x580 fs/namei.c:2892 prepare_open ipc/mqueue.c:731 [inline] do_mq_open+0x6da/0x8e0 ipc/mqueue.c:771 Which could be triggered by: struct mq_attr attr = { .mq_flags = 0, .mq_maxmsg = 9, .mq_msgsize = 0x1fffffffffffffff, .mq_curmsgs = 0, }; if (mq_open("/testing", 0x40, 3, &attr) == (mqd_t) -1) perror("mq_open"); mqueue_get_inode() was correctly rejecting the giant mq_msgsize, and preparing to return -EINVAL. During the cleanup, it calls mqueue_evict_inode() which performed resource usage tracking math for updating "user", before checking if there was a valid "user" at all (which would indicate that the calculations would be sane). Instead, delay this check to after seeing a valid "user". The overflow was real, but the results went unused, so while the flaw is harmless, it's noisy for kernel fuzzers, so just fix it by moving the calculation under the non-NULL "user" where it actually gets used. Link: http://lkml.kernel.org/r/201906072207.ECB65450@keescookSigned-off-by:Kees Cook <keescook@chromium.org> Reported-by:
Andreas Christoforou <andreaschristofo@gmail.com> Acked-by:
"Eric W. Biederman" <ebiederm@xmission.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Drew Davenport authored
For architectures using __WARN_TAINT, the WARN_ON macro did not print out the "cut here" string. The other WARN_XXX macros would print "cut here" inside __warn_printk, which is not called for WARN_ON since it doesn't have a message to print. Link: http://lkml.kernel.org/r/20190624154831.163888-1-ddavenport@chromium.org Fixes: a7bed27a ("bug: fix "cut here" location for __WARN_TAINT architectures") Signed-off-by:
Drew Davenport <ddavenport@chromium.org> Acked-by:
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Leonard Crestez authored
Add helper commands and functions for finding pointers to struct device by enumerating linux device bus/class infrastructure. This can be used to fetch subsystem and driver-specific structs: (gdb) p *$container_of($lx_device_find_by_class_name("net", "eth0"), "struct net_device", "dev") (gdb) p *$container_of($lx_device_find_by_bus_name("i2c", "0-004b"), "struct i2c_client", "dev") (gdb) p *(struct imx_port*)$lx_device_find_by_class_name("tty", "ttymxc1")->parent->driver_data Several generic "lx-device-list" functions are included to enumerate devices by bus and class: (gdb) lx-device-list-bus usb (gdb) lx-device-list-class (gdb) lx-device-list-tree &platform_bus Similar information is available in /sys but pointer values are deliberately hidden. Link: http://lkml.kernel.org/r/c948628041311cbf1b9b4cff3dda7d2073cb3eaa.1561492937.git.leonard.crestez@nxp.comSigned-off-by:Leonard Crestez <leonard.crestez@nxp.com> Reviewed-by:
Stephen Boyd <sboyd@kernel.org> Cc: Kieran Bingham <kbingham@kernel.org> Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
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Leonard Crestez authored
This is like /sys/kernel/debug/pm/pm_genpd_summary except it's accessible through a debugger. This can be useful if the target crashes or hangs because power domains were not properly enabled. Link: http://lkml.kernel.org/r/f9ee627a0d4f94b894aa202fee8a98444049bed8.1561492937.git.leonard.crestez@nxp.comSigned-off-by:
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Miroslav Lichvar authored
The PPS assert/clear offset corrections are set by the PPS_SETPARAMS ioctl in the pps_ktime structs, which also contain flags. The flags are not initialized by applications (using the timepps.h header) and they are not used by the kernel for anything except returning them back in the PPS_GETPARAMS ioctl. Set the flags to zero to make it clear they are unused and avoid leaking uninitialized data of the PPS_SETPARAMS caller to other applications that have a read access to the PPS device. Link: http://lkml.kernel.org/r/20190702092251.24303-1-mlichvar@redhat.comSigned-off-by:
Miroslav Lichvar <mlichvar@redhat.com> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Acked-by:
Rodolfo Giometti <giometti@enneenne.com> Cc: Greg KH <greg@kroah.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Joel Fernandes (Google) authored
struct pid's count is an atomic_t field used as a refcount. Use refcount_t for it which is basically atomic_t but does additional checking to prevent use-after-free bugs. For memory ordering, the only change is with the following: - if ((atomic_read(&pid->count) == 1) || - atomic_dec_and_test(&pid->count)) { + if (refcount_dec_and_test(&pid->count)) { kmem_cache_free(ns->pid_cachep, pid); Here the change is from: Fully ordered --> RELEASE + ACQUIRE (as per refcount-vs-atomic.rst) This ACQUIRE should take care of making sure the free happens after the refcount_dec_and_test(). The above hunk also removes atomic_read() since it is not needed for the code to work and it is unclear how beneficial it is. The removal lets refcount_dec_and_test() check for cases where get_pid() happened before the object was freed. Link: http://lkml.kernel.org/r/20190701183826.191936-1-joel@joelfernandes.orgSigned-off-by:Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by:
Andrea Parri <andrea.parri@amarulasolutions.com> Reviewed-by:
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Dan Carpenter authored
The dev_info.name[] array has space for RIO_MAX_DEVNAME_SZ + 1 characters. But the problem here is that we don't ensure that the user put a NUL terminator on the end of the string. It could lead to an out of bounds read. Link: http://lkml.kernel.org/r/20190529110601.GB19119@mwanda Fixes: e8de3701 ("rapidio: add mport char device driver") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Acked-by:
Alexandre Bounine <alex.bou9@gmail.com> Cc: Ira Weiny <ira.weiny@intel.com> Signed-off-by:
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Oleg Nesterov authored
Now that restore_saved_sigmask_unless() is always called with the same argument right before poll_select_copy_remaining() we can move it into poll_select_copy_remaining() and make it the only caller of restore() in fs/select.c. The patch also renames poll_select_copy_remaining(), poll_select_finish() looks better after this change. kern_select() doesn't use set_user_sigmask(), so in this case poll_select_finish() does restore_saved_sigmask_unless() "for no reason". But this won't hurt, and WARN_ON(!TIF_SIGPENDING) is still valid. Link: http://lkml.kernel.org/r/20190606140915.GC13440@redhat.comSigned-off-by:
Oleg Nesterov <oleg@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Laight <David.Laight@aculab.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Deepa Dinamani <deepa.kernel@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Eric Wong <e@80x24.org> Cc: Jason Baron <jbaron@akamai.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Oleg Nesterov authored
do_poll() returns -EINTR if interrupted and after that all its callers have to translate it into -ERESTARTNOHAND. Change do_poll() to return -ERESTARTNOHAND and update (simplify) the callers. Note that this also unifies all users of restore_saved_sigmask_unless(), see the next patch. Linus: : The *right* return value will actually be then chosen by : poll_select_copy_remaining(), which will turn ERESTARTNOHAND to EINTR : when it can't update the timeout. : : Except for the cases that use restart_block and do that instead and : don't have the whole timeout restart issue as a result. Link: http://lkml.kernel.org/r/20190606140852.GB13440@redhat.comSigned-off-by:
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Oleg Nesterov authored
task->saved_sigmask and ->restore_sigmask are only used in the ret-from- syscall paths. This means that set_user_sigmask() can save ->blocked in ->saved_sigmask and do set_restore_sigmask() to indicate that ->blocked was modified. This way the callers do not need 2 sigset_t's passed to set/restore and restore_user_sigmask() renamed to restore_saved_sigmask_unless() turns into the trivial helper which just calls restore_saved_sigmask(). Link: http://lkml.kernel.org/r/20190606113206.GA9464@redhat.comSigned-off-by:
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Alexey Dobriyan authored
struct sighand_struct::siglock field is the most used field by far, put it first so that is can be accessed without IMM8 or IMM32 encoding on x86_64. Space savings (on trimmed down VM test config): add/remove: 0/0 grow/shrink: 8/68 up/down: 49/-1147 (-1098) Function old new delta complete_signal 512 533 +21 do_signalfd4 335 346 +11 __cleanup_sighand 39 43 +4 unhandled_signal 49 52 +3 prepare_signal 692 695 +3 ignore_signals 37 40 +3 __tty_check_change.part 248 251 +3 ksys_unshare 780 781 +1 sighand_ctor 33 29 -4 ptrace_trap_notify 60 56 -4 sigqueue_free 98 91 -7 run_posix_cpu_timers 1389 1382 -7 proc_pid_status 2448 2441 -7 proc_pid_limits 344 337 -7 posix_cpu_timer_rearm 222 215 -7 posix_cpu_timer_get 249 242 -7 kill_pid_info_as_cred 243 236 -7 freeze_task 197 190 -7 flush_old_exec 1873 1866 -7 do_task_stat 3363 3356 -7 do_send_sig_info 98 91 -7 do_group_exit 147 140 -7 init_sighand 2088 2080 -8 do_notify_parent_cldstop 399 391 -8 signalfd_cleanup 50 41 -9 do_notify_parent 557 545 -12 __send_signal 1029 1017 -12 ptrace_stop 590 577 -13 get_signal 1576 1563 -13 __lock_task_sighand 112 99 -13 zap_pid_ns_processes 391 377 -14 update_rlimit_cpu 78 64 -14 tty_signal_session_leader 413 399 -14 tty_open_proc_set_tty 149 135 -14 tty_jobctrl_ioctl 936 922 -14 set_cpu_itimer 339 325 -14 ptrace_resume 226 212 -14 ptrace_notify 110 96 -14 proc_clear_tty 81 67 -14 posix_cpu_timer_del 229 215 -14 kernel_sigaction 156 142 -14 getrusage 977 963 -14 get_current_tty 98 84 -14 force_sigsegv 89 75 -14 force_sig_info 205 191 -14 flush_signals 83 69 -14 flush_itimer_signals 85 71 -14 do_timer_create 1120 1106 -14 do_sigpending 88 74 -14 do_signal_stop 537 523 -14 cgroup_init_fs_context 644 630 -14 call_usermodehelper_exec_async 402 388 -14 calculate_sigpending 58 44 -14 __x64_sys_timer_delete 248 234 -14 __set_current_blocked 80 66 -14 __ptrace_unlink 310 296 -14 __ptrace_detach.part 187 173 -14 send_sigqueue 362 347 -15 get_cpu_itimer 214 199 -15 signalfd_poll 175 159 -16 dequeue_signal 340 323 -17 do_getitimer 192 174 -18 release_task.part 1060 1040 -20 ptrace_peek_siginfo 408 387 -21 posix_cpu_timer_set 827 806 -21 exit_signals 437 416 -21 do_sigaction 541 520 -21 do_setitimer 485 464 -21 disassociate_ctty.part 545 517 -28 __x64_sys_rt_sigtimedwait 721 679 -42 __x64_sys_ptrace 1319 1277 -42 ptrace_request 1828 1782 -46 signalfd_read 507 459 -48 wait_consider_task 2027 1971 -56 do_coredump 3672 3616 -56 copy_process.part 6936 6871 -65 Link: http://lkml.kernel.org/r/20190503192800.GA18004@avx2Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by:
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Dmitry V. Levin authored
Check whether PTRACE_GET_SYSCALL_INFO semantics implemented in the kernel matches userspace expectations. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20190510152852.GG28558@altlinux.orgSigned-off-by:
Dmitry V. Levin <ldv@altlinux.org> Acked-by:
Shuah Khan <shuah@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Elvira Khabirova <lineprinter@altlinux.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Greentime Hu <greentime@andestech.com> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: James Hogan <jhogan@kernel.org> Cc: kbuild test robot <lkp@intel.com> Cc: Kees Cook <keescook@chromium.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Burton <paul.burton@mips.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by:
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Elvira Khabirova authored
PTRACE_GET_SYSCALL_INFO is a generic ptrace API that lets ptracer obtain details of the syscall the tracee is blocked in. There are two reasons for a special syscall-related ptrace request. Firstly, with the current ptrace API there are cases when ptracer cannot retrieve necessary information about syscalls. Some examples include: * The notorious int-0x80-from-64-bit-task issue. See [1] for details. In short, if a 64-bit task performs a syscall through int 0x80, its tracer has no reliable means to find out that the syscall was, in fact, a compat syscall, and misidentifies it. * Syscall-enter-stop and syscall-exit-stop look the same for the tracer. Common practice is to keep track of the sequence of ptrace-stops in order not to mix the two syscall-stops up. But it is not as simple as it looks; for example, strace had a (just recently fixed) long-standing bug where attaching strace to a tracee that is performing the execve system call led to the tracer identifying the following syscall-exit-stop as syscall-enter-stop, which messed up all the state tracking. * Since the introduction of commit 84d77d3f ("ptrace: Don't allow accessing an undumpable mm"), both PTRACE_PEEKDATA and process_vm_readv become unavailable when the process dumpable flag is cleared. On such architectures as ia64 this results in all syscall arguments being unavailable for the tracer. Secondly, ptracers also have to support a lot of arch-specific code for obtaining information about the tracee. For some architectures, this requires a ptrace(PTRACE_PEEKUSER, ...) invocation for every syscall argument and return value. ptrace(2) man page: long ptrace(enum __ptrace_request request, pid_t pid, void *addr, void *data); ... PTRACE_GET_SYSCALL_INFO Retrieve information about the syscall that caused the stop. The information is placed into the buffer pointed by "data" argument, which should be a pointer to a buffer of type "struct ptrace_syscall_info". The "addr" argument contains the size of the buffer pointed to by "data" argument (i.e., sizeof(struct ptrace_syscall_info)). The return value contains the number of bytes available to be written by the kernel. If the size of data to be written by the kernel exceeds the size specified by "addr" argument, the output is truncated. [ldv@altlinux.org: selftests/seccomp/seccomp_bpf: update for PTRACE_GET_SYSCALL_INFO] Link: http://lkml.kernel.org/r/20190708182904.GA12332@altlinux.org Link: http://lkml.kernel.org/r/20190510152842.GF28558@altlinux.orgSigned-off-by:
Elvira Khabirova <lineprinter@altlinux.org> Co-developed-by:
Andy Lutomirski <luto@kernel.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Greentime Hu <greentime@andestech.com> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: James Hogan <jhogan@kernel.org> Cc: kbuild test robot <lkp@intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Burton <paul.burton@mips.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by:
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Dmitry V. Levin authored
syscall_get_error() is required to be implemented on this architecture in addition to already implemented syscall_get_nr(), syscall_get_arguments(), syscall_get_return_value(), and syscall_get_arch() functions in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. Link: http://lkml.kernel.org/r/20190510152824.GE28558@altlinux.orgSigned-off-by:
Michael Ellerman <mpe@ellerman.id.au> Cc: Elvira Khabirova <lineprinter@altlinux.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Greentime Hu <greentime@andestech.com> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: James Hogan <jhogan@kernel.org> Cc: kbuild test robot <lkp@intel.com> Cc: Kees Cook <keescook@chromium.org> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by:
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Dmitry V. Levin authored
syscall_get_error() is required to be implemented on all architectures in addition to already implemented syscall_get_nr(), syscall_get_arguments(), syscall_get_return_value(), and syscall_get_arch() functions in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. Link: http://lkml.kernel.org/r/20190510152812.GD28558@altlinux.orgSigned-off-by:
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Dmitry V. Levin authored
syscall_get_error() is required to be implemented on all architectures in addition to already implemented syscall_get_nr(), syscall_get_arguments(), syscall_get_return_value(), and syscall_get_arch() functions in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. Link: http://lkml.kernel.org/r/20190510152803.GC28558@altlinux.orgSigned-off-by:
Paul Burton <paul.burton@mips.com> Cc: Elvira Khabirova <lineprinter@altlinux.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Greentime Hu <greentime@andestech.com> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: kbuild test robot <lkp@intel.com> Cc: Kees Cook <keescook@chromium.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by:
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Dmitry V. Levin authored
syscall_get_* functions are required to be implemented on all architectures in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. This adds remaining 2 syscall_get_* functions as documented in asm-generic/syscall.h: syscall_get_error and syscall_get_return_value. Link: http://lkml.kernel.org/r/20190510152756.GB28558@altlinux.orgSigned-off-by:
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Dmitry V. Levin authored
PTRACE_GET_SYSCALL_INFO is a generic ptrace API that lets ptracer obtain details of the syscall the tracee is blocked in. There are two reasons for a special syscall-related ptrace request. Firstly, with the current ptrace API there are cases when ptracer cannot retrieve necessary information about syscalls. Some examples include: * The notorious int-0x80-from-64-bit-task issue. See [1] for details. In short, if a 64-bit task performs a syscall through int 0x80, its tracer has no reliable means to find out that the syscall was, in fact, a compat syscall, and misidentifies it. * Syscall-enter-stop and syscall-exit-stop look the same for the tracer. Common practice is to keep track of the sequence of ptrace-stops in order not to mix the two syscall-stops up. But it is not as simple as it looks; for example, strace had a (just recently fixed) long-standing bug where attaching strace to a tracee that is performing the execve system call led to the tracer identifying the following syscall-exit-stop as syscall-enter-stop, which messed up all the state tracking. * Since the introduction of commit 84d77d3f ("ptrace: Don't allow accessing an undumpable mm"), both PTRACE_PEEKDATA and process_vm_readv become unavailable when the process dumpable flag is cleared. On such architectures as ia64 this results in all syscall arguments being unavailable for the tracer. Secondly, ptracers also have to support a lot of arch-specific code for obtaining information about the tracee. For some architectures, this requires a ptrace(PTRACE_PEEKUSER, ...) invocation for every syscall argument and return value. PTRACE_GET_SYSCALL_INFO returns the following structure: struct ptrace_syscall_info { __u8 op; /* PTRACE_SYSCALL_INFO_* */ __u32 arch __attribute__((__aligned__(sizeof(__u32)))); __u64 instruction_pointer; __u64 stack_pointer; union { struct { __u64 nr; __u64 args[6]; } entry; struct { __s64 rval; __u8 is_error; } exit; struct { __u64 nr; __u64 args[6]; __u32 ret_data; } seccomp; }; }; The structure was chosen according to [2], except for the following changes: * seccomp substructure was added as a superset of entry substructure * the type of nr field was changed from int to __u64 because syscall numbers are, as a practical matter, 64 bits * stack_pointer field was added along with instruction_pointer field since it is readily available and can save the tracer from extra PTRACE_GETREGS/PTRACE_GETREGSET calls * arch is always initialized to aid with tracing system calls such as execve() * instruction_pointer and stack_pointer are always initialized so they could be easily obtained for non-syscall stops * a boolean is_error field was added along with rval field, this way the tracer can more reliably distinguish a return value from an error value strace has been ported to PTRACE_GET_SYSCALL_INFO. Starting with release 4.26, strace uses PTRACE_GET_SYSCALL_INFO API as the preferred mechanism of obtaining syscall information. [1] https://lore.kernel.org/lkml/CA+55aFzcSVmdDj9Lh_gdbz1OzHyEm6ZrGPBDAJnywm2LF_eVyg@mail.gmail.com/ [2] https://lore.kernel.org/lkml/CAObL_7GM0n80N7J_DFw_eQyfLyzq+sf4y2AvsCCV88Tb3AwEHA@mail.gmail.com/ This patch (of 7): All syscall_get_*() and syscall_set_*() functions must be defined as static inline as on all other architectures, otherwise asm/syscall.h cannot be included in more than one compilation unit. This bug has to be fixed in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. Link: http://lkml.kernel.org/r/20190510152749.GA28558@altlinux.org Fixes: 1932fbe3 ("nds32: System calls handling") Signed-off-by:
kbuild test robot <lkp@intel.com> Acked-by:
Greentime Hu <greentime@andestech.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Elvira Khabirova <lineprinter@altlinux.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: James Hogan <jhogan@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Burton <paul.burton@mips.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by:
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Hariprasad Kelam authored
Change return type of dirty_one_transaction from int to void. As this function always return success. Fixes below issue reported by coccicheck: fs/reiserfs/journal.c:1690:5-8: Unneeded variable: "ret". Return "0" on line 1719 Link: http://lkml.kernel.org/r/20190702175430.GA5882@hari-Inspiron-1545Signed-off-by:
Hariprasad Kelam <hariprasad.kelam@gmail.com> Reviewed-by:
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YueHaibing authored
Fixes gcc '-Wunused-but-set-variable' warning: fs/ufs/super.c: In function ufs_statfs: fs/ufs/super.c:1409:32: warning: variable usb3 set but not used [-Wunused-but-set-variable] It is not used since commmit c596961d ("ufs: fix s_size/s_dsize users") Link: http://lkml.kernel.org/r/20190525140654.15924-1-yuehaibing@huawei.comSigned-off-by:
YueHaibing <yuehaibing@huawei.com> Cc: Evgeniy Dushistov <dushistov@mail.ru> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Mathieu Malaterre authored
strncpy() was used to copy a fixed size buffer. Since NUL-terminating string is not required here, prefer a memcpy function. The generated code (ppc32) remains the same. Silence the following warning triggered using W=1: fs/hfsplus/xattr.c:410:3: warning: 'strncpy' output truncated before terminating nul copying 4 bytes from a string of the same length [-Wstringop-truncation] Link: http://lkml.kernel.org/r/20190529113341.11972-1-malat@debian.orgSigned-off-by:
Mathieu Malaterre <malat@debian.org> Reviewed-by:
Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by:
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