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2020-07-01block: move ->make_request_fn to struct block_device_operationsChristoph Hellwig
The make_request_fn is a little weird in that it sits directly in struct request_queue instead of an operation vector. Replace it with a block_device_operations method called submit_bio (which describes much better what it does). Also remove the request_queue argument to it, as the queue can be derived pretty trivially from the bio. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01block: remove the request_queue argument from blk_queue_splitChristoph Hellwig
The queue can be trivially derived from the bio, so pass one less argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01usb: typec: Add data structure for Enter_USB messageHeikki Krogerus
This data structure can be delivered to the mux drivers when Enter_USB Message is used exactly the same way as the Alternate Mode specific data structures are delivered to the mux drivers when Enter Mode Messages are used. The Enter_USB data structure shall have all details related to the Enter_USB Message, most importantly the Enter_USB Date Object that was used. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20200701115618.22482-3-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-01usb: typec: Combine the definitions for Accessory and USB modesHeikki Krogerus
There is no need to describe them sparately. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20200701115618.22482-2-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-01usb: fix kernel-doc warnings and formatting in <linux/usb.h>Randy Dunlap
Fix kernel-doc warnings in <linux/usb.h>: ../include/linux/usb.h:713: warning: Function parameter or member 'use_generic_driver' not described in 'usb_device' ../include/linux/usb.h:1253: warning: Function parameter or member 'match' not described in 'usb_device_driver' ../include/linux/usb.h:1253: warning: Function parameter or member 'id_table' not described in 'usb_device_driver' Also drop an extra blank line and fix indentation. Fixes: 77419aa403ca ("USB: Fallback to generic driver when specific driver fails") Fixes: 88b7381a939d ("USB: Select better matching USB drivers when available") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Bastien Nocera <hadess@hadess.net> Link: https://lore.kernel.org/r/7014bab2-268c-69f6-7ef5-57fbd45c8b08@infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-01backlight: sky81452: Privatize platform dataLinus Walleij
The only way the platform data for the SKY81452 ever gets populated is through the device tree. The MFD device is bothered with this for no reason at all. Just allocate the platform data in the driver and be happy. Cc: Gyungoh Yoo <jack.yoo@skyworksinc.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-07-01backlight: sky81452: Convert to GPIO descriptorsLinus Walleij
The SKY81452 backlight driver just obtains a GPIO (named "gpios" in the device tree) drives it high and leaves it high until the driver is removed. Switch to use GPIO descriptors for this, simple and straight-forward. Cc: Gyungoh Yoo <jack.yoo@skyworksinc.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-07-01of_graph: add of_graph_is_present()Dmitry Osipenko
In some cases it's very useful to silently check whether port node exists at all in a device-tree before proceeding with parsing the graph. The DRM bridges code is one example of such case where absence of a graph in a device-tree is a legit condition. This patch adds of_graph_is_present() which returns true if given device-tree node contains OF graph port. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200701074232.13632-2-digetx@gmail.com
2020-06-30of: mdio: provide devm_of_mdiobus_register()Bartosz Golaszewski
Implement a managed variant of of_mdiobus_register(). We need to make mdio_devres into its own module because otherwise we'd hit circular sumbol dependencies between phylib and of_mdio. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30of: mdio: remove the 'extern' keyword from function declarationsBartosz Golaszewski
The 'extern' keyword in headers doesn't have any benefit. Remove them all from the of_mdio.h header. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30net: phy: don't abuse devres in devm_mdiobus_register()Bartosz Golaszewski
We currently have two managed helpers for mdiobus - devm_mdiobus_alloc() and devm_mdiobus_register(). The idea behind devres is that the release callback releases whatever resource the devm function allocates. In the mdiobus case however there's no devres associated with the device by devm_mdiobus_register(). Instead the release callback for devm_mdiobus_alloc(): _devm_mdiobus_free() unregisters the device if it is marked as managed. This all seems wrong. The managed structure shouldn't need to know or care about whether it's managed or not - and this is the case now for struct mii_bus. The devres wrapper should be opaque to the managed resource. This changeset makes devm_mdiobus_alloc() and devm_mdiobus_register() conform to common devres standards: devm_mdiobus_alloc() allocates a devres structure and registers a callback that will call mdiobus_free(). __devm_mdiobus_register() allocated another devres and registers a callback that will unregister the bus. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30phy: un-inline devm_mdiobus_register()Bartosz Golaszewski
Functions should only be static inline if they're very short. This devres helper is already over 10 lines and it will grow soon as we'll be improving upon its approach. Pull it into mdio_devres.c. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30net: qed: update copyright yearsAlexander Lobakin
Set the actual copyright holder and years in all qed source files. Signed-off-by: Alexander Lobakin <alobakin@marvell.com> Signed-off-by: Igor Russkikh <irusskikh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30net: qed: convert to SPDX License IdentifiersAlexander Lobakin
QLogic QED drivers source code is dual licensed under GPL-2.0/BSD-3-Clause. Remove all the boilerplates in the existing code and replace it with the correct SPDX tag. Signed-off-by: Alexander Lobakin <alobakin@marvell.com> Signed-off-by: Igor Russkikh <irusskikh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30net: qed: correct existing SPDX tagsAlexander Lobakin
QLogic QED drivers source code is dual licensed under GPL-2.0/BSD-3-Clause. Correct already existing but wrong SPDX tags to match the actual license. Signed-off-by: Alexander Lobakin <alobakin@marvell.com> Signed-off-by: Igor Russkikh <irusskikh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30PCI: Make pcie_find_root_port() work for Root PortsMika Westerberg
Commit 6ae72bfa656e ("PCI: Unify pcie_find_root_port() and pci_find_pcie_root_port()") broke acpi_pci_bridge_d3() because calling pcie_find_root_port() on a Root Port returned NULL when it should return the Root Port, which in turn broke power management of PCIe hierarchies. Rework pcie_find_root_port() so it returns its argument when it is already a Root Port. [bhelgaas: test device only once, test for PCIe] Fixes: 6ae72bfa656e ("PCI: Unify pcie_find_root_port() and pci_find_pcie_root_port()") Link: https://lore.kernel.org/r/20200622161248.51099-1-mika.westerberg@linux.intel.com Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2020-06-30Merge tag 'gpio-updates-for-v5.9-part1' of ↵Linus Walleij
git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel gpio updates for v5.9 - use kobj_to_dev() in sysfs interface - kerneldoc and documentation fixes - relax the interrupt flags in gpio-mpc8xxx - support new model in gpio-pca953x - remove a redundant check from gpio-max732x - support a new platform in gpio-zynq (+ some minor fixes) - don't depend on GPIOLIB when already inside the "if GPIOLIB" in Kconfig - support PM ops for suspend in gpio-omap - minor tweaks in gpiolib
2020-06-30Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpfDavid S. Miller
Daniel Borkmann says: ==================== pull-request: bpf 2020-06-30 The following pull-request contains BPF updates for your *net* tree. We've added 28 non-merge commits during the last 9 day(s) which contain a total of 35 files changed, 486 insertions(+), 232 deletions(-). The main changes are: 1) Fix an incorrect verifier branch elimination for PTR_TO_BTF_ID pointer types, from Yonghong Song. 2) Fix UAPI for sockmap and flow_dissector progs that were ignoring various arguments passed to BPF_PROG_{ATTACH,DETACH}, from Lorenz Bauer & Jakub Sitnicki. 3) Fix broken AF_XDP DMA hacks that are poking into dma-direct and swiotlb internals and integrate it properly into DMA core, from Christoph Hellwig. 4) Fix RCU splat from recent changes to avoid skipping ingress policy when kTLS is enabled, from John Fastabend. 5) Fix BPF ringbuf map to enforce size to be the power of 2 in order for its position masking to work, from Andrii Nakryiko. 6) Fix regression from CAP_BPF work to re-allow CAP_SYS_ADMIN for loading of network programs, from Maciej Żenczykowski. 7) Fix libbpf section name prefix for devmap progs, from Jesper Dangaard Brouer. 8) Fix formatting in UAPI documentation for BPF helpers, from Quentin Monnet. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-30ring-buffer: speed up buffer resets by avoiding synchronize_rcu for each CPUNicholas Piggin
On a 144 thread system, `perf ftrace` takes about 20 seconds to start up, due to calling synchronize_rcu() for each CPU. cat /proc/108560/stack 0xc0003e7eb336f470 __switch_to+0x2e0/0x480 __wait_rcu_gp+0x20c/0x220 synchronize_rcu+0x9c/0xc0 ring_buffer_reset_cpu+0x88/0x2e0 tracing_reset_online_cpus+0x84/0xe0 tracing_open+0x1d4/0x1f0 On a system with 10x more threads, it starts to become an annoyance. Batch these up so we disable all the per-cpu buffers first, then synchronize_rcu() once, then reset each of the buffers. This brings the time down to about 0.5s. Link: https://lkml.kernel.org/r/20200625053403.2386972-1-npiggin@gmail.com Tested-by: Anton Blanchard <anton@ozlabs.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-06-30Merge tag 'fixes-v5.8-rc3-a' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security Pull security subsystem fixes from James Morris: "Two simple fixes for v5.8: - Fix hook iteration and default value for inode_copy_up_xattr (KP Singh) - Fix the key_permission LSM hook function type (Sami Tolvanen)" * tag 'fixes-v5.8-rc3-a' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: security: Fix hook iteration and default value for inode_copy_up_xattr security: fix the key_permission LSM hook function type
2020-06-30Input: add `SW_MACHINE_COVER`Merlijn Wajer
This event code represents the state of a removable cover of a device. Value 0 means that the cover is open or removed, value 1 means that the cover is closed. Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Merlijn Wajer <merlijn@wizzup.org> Link: https://lore.kernel.org/r/20200612125402.18393-2-merlijn@wizzup.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2020-06-30task_work: teach task_work_add() to do signal_wake_up()Oleg Nesterov
So that the target task will exit the wait_event_interruptible-like loop and call task_work_run() asap. The patch turns "bool notify" into 0,TWA_RESUME,TWA_SIGNAL enum, the new TWA_SIGNAL flag implies signal_wake_up(). However, it needs to avoid the race with recalc_sigpending(), so the patch also adds the new JOBCTL_TASK_WORK bit included in JOBCTL_PENDING_MASK. TODO: once this patch is merged we need to change all current users of task_work_add(notify = true) to use TWA_RESUME. Cc: stable@vger.kernel.org # v5.7 Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-30bpf: sockmap: Require attach_bpf_fd when detaching a programLorenz Bauer
The sockmap code currently ignores the value of attach_bpf_fd when detaching a program. This is contrary to the usual behaviour of checking that attach_bpf_fd represents the currently attached program. Ensure that attach_bpf_fd is indeed the currently attached program. It turns out that all sockmap selftests already do this, which indicates that this is unlikely to cause breakage. Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200629095630.7933-5-lmb@cloudflare.com
2020-06-30bpf: flow_dissector: Check value of unused flags to BPF_PROG_DETACHLorenz Bauer
Using BPF_PROG_DETACH on a flow dissector program supports neither attach_flags nor attach_bpf_fd. Yet no value is enforced for them. Enforce that attach_flags are zero, and require the current program to be passed via attach_bpf_fd. This allows us to remove the check for CAP_SYS_ADMIN, since userspace can now no longer remove arbitrary flow dissector programs. Fixes: b27f7bb590ba ("flow_dissector: Move out netns_bpf prog callbacks") Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200629095630.7933-3-lmb@cloudflare.com
2020-06-30soundwire: bus: initialize bus clock base and scale registersPierre-Louis Bossart
The SoundWire 1.2 specification adds new registers to allow for seamless clock changes while audio transfers are on-going. Program them following the specification. Note that dynamic clock changes are not supported for now, this only adds the register initialization. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20200608205436.2402-5-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-06-30soundwire: extend SDW_SLAVE_ENTRYPierre-Louis Bossart
The SoundWire 1.2 specification adds new capabilities that were not present in previous version, such as the class ID. To enable support for class drivers, and well as drivers that address a specific version, all fields of the sdw_device_id structure need to be exposed. For SoundWire 1.0 and 1.1 devices, a wildcard is used so class and version information are ignored. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@linux.intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20200608205436.2402-4-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-06-30soundwire: add definitions for 1.2 specPierre-Louis Bossart
Add definitions for register offsets and bit fields from the MIPI SoundWire 1.2 specification (available to MIPI members at https://members.mipi.org/wg/All-Members/document/download/78371) Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20200608205436.2402-2-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-06-30blk-mq: pass request queue into get/put budget callbackMing Lei
blk-mq budget is abstract from scsi's device queue depth, and it is always per-request-queue instead of hctx. It can be quite absurd to get a budget from one hctx, then dequeue a request from scheduler queue, and this request may not belong to this hctx, at least for bfq and deadline. So fix the mess and always pass request queue to get/put budget callback. Signed-off-by: Ming Lei <ming.lei@redhat.com> Tested-by: Baolin Wang <baolin.wang7@gmail.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Baolin Wang <baolin.wang7@gmail.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Douglas Anderson <dianders@chromium.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-30dma-mapping: Add a new dma_need_sync APIChristoph Hellwig
Add a new API to check if calls to dma_sync_single_for_{device,cpu} are required for a given DMA streaming mapping. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200629130359.2690853-2-hch@lst.de
2020-06-30iov_iter: Move unnecessary inclusion of crypto/hash.hHerbert Xu
The header file linux/uio.h includes crypto/hash.h which pulls in most of the Crypto API. Since linux/uio.h is used throughout the kernel this means that every tiny bit of change to the Crypto API causes the entire kernel to get rebuilt. This patch fixes this by moving it into lib/iov_iter.c instead where it is actually used. This patch also fixes the ifdef to use CRYPTO_HASH instead of just CRYPTO which does not guarantee the existence of ahash. Unfortunately a number of drivers were relying on linux/uio.h to provide access to linux/slab.h. This patch adds inclusions of linux/slab.h as detected by build failures. Also skbuff.h was relying on this to provide a declaration for ahash_request. This patch adds a forward declaration instead. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-06-30firmware: arm_scmi: Add fast_switch_possible() interfaceNicola Mazzucato
Add a new fast_switch_possible interface to the existing perf_ops to export the information of whether or not fast_switch is possible for a given device. This can be used by the cpufreq driver and framework to choose proper mechanism for frequency change. Link: https://lore.kernel.org/r/20200617094332.8391-1-nicola.mazzucato@arm.com Suggested-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2020-06-30iommu: Move sg_table wrapper out of CONFIG_IOMMU_SUPPORTMarek Szyprowski
Move the recently added sg_table wrapper out of CONFIG_IOMMU_SUPPORT to let the client code copile also when IOMMU support is disabled. Fixes: 48530d9fab0d ("iommu: add generic helper for mapping sgtable objects") Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20200630081756.18526-1-m.szyprowski@samsung.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2020-06-29ethtool: Add link extended stateAmit Cohen
Currently, drivers can only tell whether the link is up/down using LINKSTATE_GET, but no additional information is given. Add attributes to LINKSTATE_GET command in order to allow drivers to expose the user more information in addition to link state to ease the debug process, for example, reason for link down state. Extended state consists of two attributes - link_ext_state and link_ext_substate. The idea is to avoid 'vendor specific' states in order to prevent drivers to use specific link_ext_state that can be in the future common link_ext_state. The substates allows drivers to add more information to the common link_ext_state. For example, vendor can expose 'Autoneg' as link_ext_state and add 'No partner detected during force mode' as link_ext_substate. If a driver cannot pinpoint the extended state with the substate accuracy, it is free to expose only the extended state and omit the substate attribute. Signed-off-by: Amit Cohen <amitc@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Petr Machata <petrm@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-29Merge tag 'mac80211-for-net-2020-06-29' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211 Johannes Berg says: ==================== Couple of fixes/small things: * TX control port status check fixed to not assume frame format * mesh control port fixes * error handling/leak fixes when starting AP, with HE attributes * fix broadcast packet handling with encapsulation offload * add new AKM suites * and a small code cleanup ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-29audit: add gfp parameter to audit_log_nfcfgRichard Guy Briggs
Fixed an inconsistent use of GFP flags in nft_obj_notify() that used GFP_KERNEL when a GFP flag was passed in to that function. Given this allocated memory was then used in audit_log_nfcfg() it led to an audit of all other GFP allocations in net/netfilter/nf_tables_api.c and a modification of audit_log_nfcfg() to accept a GFP parameter. Reported-by: Dan Carptenter <dan.carpenter@oracle.com> Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
2020-06-30drm: pl111: Absorb the external register headerLinus Walleij
The PL111 DRM driver is now the sole user of the external CLCD registers header file, so let's absorb that into the pl111_drm.h file and save the external include. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Russell King <linux@armlinux.org.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200609200446.153209-3-linus.walleij@linaro.org
2020-06-30video: fbdev: amba-clcd: Retire elder CLCD driverLinus Walleij
All the functionality in this driver has been reimplemented in the new DRM driver in drivers/gpu/drm/pl111/* and all the boards using it have been migrated to use the DRM driver with all configuration coming from the device tree. I started the work to migrate the CLCD driver to DRM in april 2017 and it took a little more than 3 years to do this properly without leaving any platforms behind. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Russell King <linux@armlinux.org.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200609200446.153209-2-linus.walleij@linaro.org
2020-06-29rculist: Add ASSERT_EXCLUSIVE_ACCESS() to __list_splice_init_rcu()Paul E. McKenney
After the sync() in __list_splice_init_rcu(), there should be no readers traversing the old list. This commit therefore enlists the help of KCSAN to verify this condition via a pair of calls to ASSERT_EXCLUSIVE_ACCESS(). Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Marco Elver <elver@google.com>
2020-06-29Merge branches 'doc.2020.06.29a', 'fixes.2020.06.29a', ↵Paul E. McKenney
'kfree_rcu.2020.06.29a', 'rcu-tasks.2020.06.29a', 'scale.2020.06.29a', 'srcu.2020.06.29a' and 'torture.2020.06.29a' into HEAD doc.2020.06.29a: Documentation updates. fixes.2020.06.29a: Miscellaneous fixes. kfree_rcu.2020.06.29a: kfree_rcu() updates. rcu-tasks.2020.06.29a: RCU Tasks updates. scale.2020.06.29a: Read-side scalability tests. srcu.2020.06.29a: SRCU updates. torture.2020.06.29a: Torture-test updates.
2020-06-29rcutorture: Add races with task-exit processingPaul E. McKenney
Several variants of Linux-kernel RCU interact with task-exit processing, including preemptible RCU, Tasks RCU, and Tasks Trace RCU. This commit therefore adds testing of this interaction to rcutorture by adding rcutorture.read_exit_burst and rcutorture.read_exit_delay kernel-boot parameters. These kernel parameters control the frequency and spacing of special read-then-exit kthreads that are spawned. [ paulmck: Apply feedback from Dan Carpenter's static checker. ] [ paulmck: Reduce latency to avoid false-positive shutdown hangs. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu-tasks: Fix synchronize_rcu_tasks_trace() header commentPaul E. McKenney
The synchronize_rcu_tasks_trace() header comment incorrectly claims that any number of things delimit RCU Tasks Trace read-side critical sections, when in fact only rcu_read_lock_trace() and rcu_read_unlock_trace() do so. This commit therefore fixes this comment, and, while in the area, fixes a typo in the rcu_read_lock_trace() header comment. Reported-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu: Introduce single argument kvfree_rcu() interfaceUladzislau Rezki (Sony)
Make kvfree_rcu() capable of freeing objects that will not embed an rcu_head within it. This saves storage overhead in such objects. Reclaiming headless objects this way requires only a single argument (pointer to the object). After this patch, there are two ways to use kvfree_rcu(): a) kvfree_rcu(ptr, rhf); struct X { struct rcu_head rhf; unsigned char data[100]; }; void *ptr = kvmalloc(sizeof(struct X), GFP_KERNEL); if (ptr) kvfree_rcu(ptr, rhf); b) kvfree_rcu(ptr); void *ptr = kvmalloc(some_bytes, GFP_KERNEL); if (ptr) kvfree_rcu(ptr); Note that the headless usage (example b) can only be used in a code that can sleep. This is enforced by the CONFIG_DEBUG_ATOMIC_SLEEP option. Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu: Support reclaim for head-less objectUladzislau Rezki (Sony)
Update the kvfree_call_rcu() function with head-less support. This allows RCU to reclaim objects without an embedded rcu_head. tree-RCU: We introduce two chains of arrays to store SLAB-backed and vmalloc pointers, each. Storage in either of these arrays does not require embedding an rcu_head within the object. Maintaining the arrays may become impossible due to high memory pressure. For such cases there is an emergency path. Objects with rcu_head inside are just queued on a backup rcu_head list. Later on that list is drained. As for the head-less variant, as the current context can sleep, the following emergency measures are applied: a) Synchronously wait until a grace period has elapsed. b) Call kvfree(). tiny-RCU: For double argument calls, there are no new changes in behavior. For single argument call, kvfree() is directly inlined on the current stack after a synchronize_rcu() call. Note that for tiny-RCU, any call to synchronize_rcu() is actually a quiescent state, therefore it does nothing. Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu: Introduce 2 arg kvfree_rcu() interfaceUladzislau Rezki (Sony)
kvmalloc() can allocate two types of objects: SLAB backed and vmalloc backed. How it behaves depends on requested object's size and memory pressure. Add a kvfree_rcu() interface that can free memory allocated via kvmalloc(). It is a simple alias to kfree_rcu() which can now handle either type of object. <snip> struct test_kvfree_rcu { struct rcu_head rcu; unsigned char array[100]; }; struct test_kvfree_rcu *p; p = kvmalloc(10 * PAGE_SIZE); if (p) kvfree_rcu(p, rcu); <snip> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu: Rename *_kfree_callback/*_kfree_rcu_offset/kfree_call_*Uladzislau Rezki (Sony)
The following changes are introduced: 1. Rename rcu_invoke_kfree_callback() to rcu_invoke_kvfree_callback(), as well as the associated trace events, so the rcu_kfree_callback(), becomes rcu_kvfree_callback(). The reason is to be aligned with kvfree() notation. 2. Rename __is_kfree_rcu_offset to __is_kvfree_rcu_offset. All RCU paths use kvfree() now instead of kfree(), thus rename it. 3. Rename kfree_call_rcu() to the kvfree_call_rcu(). The reason is, it is capable of freeing vmalloc() memory now. Do the same with __kfree_rcu() macro, it becomes __kvfree_rcu(), the goal is the same. Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29rcu: Fix some kernel-doc warningsMauro Carvalho Chehab
The current code provokes some kernel-doc warnings: ./kernel/rcu/tree.c:2915: warning: Function parameter or member 'count' not described in 'kfree_rcu_cpu' ./include/linux/rculist.h:517: warning: bad line: [@right ][node2 ... ] ./include/linux/rculist.h:2: WARNING: Unexpected indentation. This commit therefore moves the comment for "count" to the kernel-doc markup and adds a missing "*" on one kernel-doc continuation line. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29docs: RCU: Convert rculist_nulls.txt to ReSTMauro Carvalho Chehab
- Add a SPDX header; - Adjust document title; - Some whitespace fixes and new line breaks; - Mark literal blocks as such; - Add it to RCU/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29thermal: Rename set_mode() to change_mode()Andrzej Pietrasiewicz
set_mode() is only called when tzd's mode is about to change. Actual setting is performed in thermal_core, in thermal_zone_device_set_mode(). The meaning of set_mode() callback is actually to notify the driver about the mode being changed and giving the driver a chance to oppose such change. To better reflect the purpose of the method rename it to change_mode() Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> [for acerhdf] Acked-by: Peter Kaestle <peter@piie.net> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200629122925.21729-12-andrzej.p@collabora.com
2020-06-29thermal: Add mode helpersAndrzej Pietrasiewicz
Prepare for making the drivers not access tzd's private members. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [staticize thermal_zone_device_set_mode()] Signed-off-by: kernel test robot <lkp@intel.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200629122925.21729-7-andrzej.p@collabora.com
2020-06-29thermal: remove get_mode() operation of driversAndrzej Pietrasiewicz
get_mode() is now redundant, as the state is stored in struct thermal_zone_device. Consequently the "mode" attribute in sysfs can always be visible, because it is always possible to get the mode from struct tzd. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> [for acerhdf] Acked-by: Peter Kaestle <peter@piie.net> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200629122925.21729-6-andrzej.p@collabora.com
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