Changes in Makefile

bad6722e - kexec: Consolidate machine_kexec_mask_interrupts() implementation

Wed, 04 Dec 2024 14:20:02 +0000

kexec: Consolidate machine_kexec_mask_interrupts() implementationConsolidate the machine_kexec_mask_interrupts implementation into a commonfunction located in a new file: kernel/irq/kexec.c. This removes duplicateimplementations from architecture-specific files in arch/arm, arch/arm64,arch/powerpc, and arch/riscv, reducing code duplication and improvingmaintainability.The new implementation retains architecture-specific behavior forCONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implementedfor ARM64. When enabled (currently for ARM64), it clears the active stateof interrupts forwarded to virtual machines (VMs) before handling otherinterrupt masking operations.Signed-off-by: Eliav Farber Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20241204142003.32859-2-farbere@amazon.com List of files: /linux-6.15/kernel/irq/Makefile

835a486c - genirq: Add mechanism to multiplex a single HW IPI

Tue, 03 Jan 2023 14:12:15 +0000

genirq: Add mechanism to multiplex a single HW IPIAll RISC-V platforms have a single HW IPI provided by the INTC localinterrupt controller. The HW method to trigger INTC IPI can be throughexternal irqchip (e.g. RISC-V AIA), through platform specific device(e.g. SiFive CLINT timer), or through firmware (e.g. SBI IPI call).To support multiple IPIs on RISC-V, add a generic IPI multiplexingmechanism which help us create multiple virtual IPIs using a singleHW IPI. This generic IPI multiplexing is inspired by the Apple AICirqchip driver and it is shared by various RISC-V irqchip drivers.Signed-off-by: Anup Patel Reviewed-by: Hector Martin Tested-by: Hector Martin Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230103141221.772261-4-apatel@ventanamicro.com List of files: /linux-6.15/kernel/irq/Makefile

6aed82de - genirq/timings: Add selftest for circular array

Mon, 27 May 2019 20:55:19 +0000

genirq/timings: Add selftest for circular arrayDue to the complexity of the code and the difficulty to debug it, add someselftests to the framework in order to spot issues or regression at boottime when the runtime testing is enabled for this subsystem.This tests the circular buffer at the limits and validates: - the encoding / decoding of the values - the macro to browse the irq timings circular buffer - the function to push data in the circular bufferSigned-off-by: Daniel Lezcano Signed-off-by: Thomas Gleixner Cc: andriy.shevchenko@linux.intel.comLink: https://lkml.kernel.org/r/20190527205521.12091-7-daniel.lezcano@linaro.org List of files: /linux-6.15/kernel/irq/Makefile

b2441318 - License cleanup: add SPDX GPL-2.0 license identifier to files with no license

Wed, 01 Nov 2017 14:07:57 +0000

License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseMany source files in the tree are missing licensing information, whichmakes it harder for compliance tools to determine the correct license.By default all files without license information are under the defaultlicense of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'SPDX license identifier. The SPDX identifier is a legally bindingshorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart andPhilippe Ombredanne.How this work was done:Patches were generated and checked against linux-4.14-rc6 for a subset ofthe use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up caseswhere non-standard license headers were used, and references to licensehad to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied toa file was done in a spreadsheet of side by side results from of theoutput of two independent scanners (ScanCode & Windriver) producing SPDXtag:value files created by Philippe Ombredanne. Philippe prepared thebase worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 filesassessed. Kate Stewart did a file by file comparison of the scannerresults in the spreadsheet to determine which SPDX license identifier(s)to be applied to the file. She confirmed any determination that was notimmediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines).All documentation files were explicitly excluded.The following heuristics were used to determine which SPDX licenseidentifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time.In total, over 70 hours of logged manual review was done on thespreadsheet to determine the SPDX license identifiers to apply to thesource files by Kate, Philippe, Thomas and, in some cases, confirmationby lawyers working with the Linux Foundation.Kate also obtained a third independent scan of the 4.13 code base fromFOSSology, and compared selected files where the other two scannersdisagreed against that SPDX file, to see if there was new insights. TheWindriver scanner is based on an older version of FOSSology in part, sothey are related.Thomas did random spot checks in about 500 files from the spreadsheetsfor the uapi headers and agreed with SPDX license identifier in thefiles he inspected. For the non-uapi files Thomas did random spot checksin about 15000 files.In initial set of patches against 4.14-rc6, 3 files were found to havecopy/paste license identifier errors, and have been fixed to reflect thecorrect identifier.Additionally Philippe spent 10 hours this week doing a detailed manualinspection and review of the 12,461 patched files from the initial patchversion early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correctThis produced a worksheet with 20 files needing minor correction. Thisworksheet was then exported into 3 different .csv files for thedifferent types of files to be modified.These .csv files were then reviewed by Greg. Thomas wrote a script toparse the csv files and add the proper SPDX tag to the file, in theformat that the file expected. This script was further refined by Gregbased on the output to detect more types of files automatically and todistinguish between header and source .c files (which need differentcomment types.) Finally Greg ran the script using the .csv files togenerate the patches.Reviewed-by: Kate Stewart Reviewed-by: Philippe Ombredanne Reviewed-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman List of files: /linux-6.15/kernel/irq/Makefile

2f75d9e1 - genirq: Implement bitmap matrix allocator

Wed, 13 Sep 2017 21:29:14 +0000

genirq: Implement bitmap matrix allocatorImplement the infrastructure for a simple bitmap based allocator, whichwill replace the x86 vector allocator. It's in the core code as otherarchitectures might be able to reuse/extend it. For now it only implementsallocations for single CPUs, but it's simple to add multi CPU allocationsupport if required.The concept is rather simple: Global information: system_vector bitmap global accounting PerCPU information: allocation bitmap managed allocation bitmap local accountingThe system vector bitmap is used to exclude vectors system wide from theallocation space.The allocation bitmap is used to keep track of per cpu used vectors.The managed allocation bitmap is used to reserve vectors for managedinterrupts.When a regular (non managed) interrupt allocation happens then thefollowing rule applies: tmpmap = system_map | alloc_map | managed_map find_zero_bit(tmpmap)Oring the bitmaps together gives the real available space. The same ruleapplies for reserving a managed interrupt vector. But contrary to theregular interrupts the reservation only marks the bit in the managed mapand therefor excludes it from the regular allocations. The managed map isonly cleaned out when the a managed interrupt is completely released and itstays alive accross CPU offline/online operations.For managed interrupt allocations the rule is: tmpmap = managed_map & ~alloc_map find_first_bit(tmpmap)This returns the first bit which is in the managed map, but not yetallocated in the allocation map. The allocation marks it in the allocationmap and hands it back to the caller for use.The rest of the code are helper functions to handle the variousrequirements and the accounting which are necessary to replace the x86vector allocation code. The result is a single patch as the evolution ofthis infrastructure cannot be represented in bits and pieces.Signed-off-by: Thomas Gleixner Tested-by: Juergen Gross Tested-by: Yu Chen Acked-by: Juergen Gross Cc: Boris Ostrovsky Cc: Tony Luck Cc: Marc Zyngier Cc: Alok Kataria Cc: Joerg Roedel Cc: "Rafael J. Wysocki" Cc: Steven Rostedt Cc: Christoph Hellwig Cc: Peter Zijlstra Cc: Borislav Petkov Cc: Paolo Bonzini Cc: Rui Zhang Cc: "K. Y. Srinivasan" Cc: Arjan van de Ven Cc: Dan Williams Cc: Chris Metcalf Cc: Len Brown Link: https://lkml.kernel.org/r/20170913213153.185437174@linutronix.de List of files: /linux-6.15/kernel/irq/Makefile

b19af510 - genirq/irq_sim: Add a simple interrupt simulator framework

Mon, 14 Aug 2017 14:53:16 +0000

genirq/irq_sim: Add a simple interrupt simulator frameworkImplement a simple, irq_work-based framework for simulatinginterrupts. Currently the API exposes routines for initializing anddeinitializing the simulator object, enqueueing the interrupts andretrieving the allocated interrupt numbers based on the offset of thedummy interrupt in the simulator struct.Signed-off-by: Bartosz Golaszewski Reviewed-by: Jonathan Cameron Cc: Lars-Peter Clausen Cc: Jonathan Corbet Cc: Marc Zyngier Cc: Linus Walleij Cc: linux-doc@vger.kernel.orgCc: linux-gpio@vger.kernel.orgCc: Bamvor Jian Zhang Cc: Jonathan Cameron Link: http://lkml.kernel.org/r/20170814145318.6495-2-brgl@bgdev.plSigned-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

b2d3d61a - genirq/timings: Add infrastructure to track the interrupt timings

Fri, 23 Jun 2017 14:11:07 +0000

genirq/timings: Add infrastructure to track the interrupt timingsThe interrupt framework gives a lot of information about each interrupt. Itdoes not keep track of when those interrupts occur though, which is aprerequisite for estimating the next interrupt arrival for power managementpurposes.Add a mechanism to record the timestamp for each interrupt occurrences in aper-CPU circular buffer to help with the prediction of the next occurrenceusing a statistical model.Each CPU can store up to IRQ_TIMINGS_SIZE events , thecurrent value of IRQ_TIMINGS_SIZE is 32.Each event is encoded into a single u64, where the high 48 bits are usedfor the timestamp and the low 16 bits are for the irq number.A static key is introduced so when the irq prediction is switched off atruntime, the overhead is near to zero.It results in most of the code in internals.h for inline reasons and a veryfew in the new file timings.c. The latter will contain more in the next patchwhich will provide the statistical model for the next event prediction.Signed-off-by: Daniel Lezcano Signed-off-by: Thomas Gleixner Acked-by: Nicolas Pitre Cc: Jens Axboe Cc: Hannes Reinecke Cc: Vincent Guittot Cc: "Rafael J . Wysocki" Cc: Peter Zijlstra Cc: Bjorn Helgaas Link: http://lkml.kernel.org/r/1498227072-5980-1-git-send-email-daniel.lezcano@linaro.org List of files: /linux-6.15/kernel/irq/Makefile

087cdfb6 - genirq/debugfs: Add proper debugfs interface

Mon, 19 Jun 2017 23:37:17 +0000

genirq/debugfs: Add proper debugfs interfaceDebugging (hierarchical) interupt domains is tedious as there is noinformation about the hierarchy and no information about states ofinterrupts in the various domain levels.Add a debugfs directory 'irq' and subdirectories 'domains' and 'irqs'.The domains directory contains the domain files. The content is informationabout the domain. If the domain is part of a hierarchy then the parentdomains are printed as well.# ls /sys/kernel/debug/irq/domains/default INTEL-IR-2 INTEL-IR-MSI-2 IO-APIC-IR-2 PCI-MSIDMAR-MSI INTEL-IR-3 INTEL-IR-MSI-3 IO-APIC-IR-3 unknown-1INTEL-IR-0 INTEL-IR-MSI-0 IO-APIC-IR-0 IO-APIC-IR-4 VECTORINTEL-IR-1 INTEL-IR-MSI-1 IO-APIC-IR-1 PCI-HT# cat /sys/kernel/debug/irq/domains/VECTOR name: VECTOR size: 0 mapped: 216 flags: 0x00000041# cat /sys/kernel/debug/irq/domains/IO-APIC-IR-0 name: IO-APIC-IR-0 size: 24 mapped: 19 flags: 0x00000041 parent: INTEL-IR-3 name: INTEL-IR-3 size: 65536 mapped: 167 flags: 0x00000041 parent: VECTOR name: VECTOR size: 0 mapped: 216 flags: 0x00000041Unfortunately there is no per cpu information about the VECTOR domain (yet).The irqs directory contains detailed information about mapped interrupts.# cat /sys/kernel/debug/irq/irqs/3handler: handle_edge_irqstatus: 0x00004000istate: 0x00000000ddepth: 1wdepth: 0dstate: 0x01018000 IRQD_IRQ_DISABLED IRQD_SINGLE_TARGET IRQD_MOVE_PCNTXTnode: 0affinity: 0-143effectiv: 0pending: domain: IO-APIC-IR-0 hwirq: 0x3 chip: IR-IO-APIC flags: 0x10 IRQCHIP_SKIP_SET_WAKE parent: domain: INTEL-IR-3 hwirq: 0x20000 chip: INTEL-IR flags: 0x0 parent: domain: VECTOR hwirq: 0x3 chip: APIC flags: 0x0This was developed to simplify the debugging of the managed affinitychanges.Signed-off-by: Thomas Gleixner Acked-by: Marc Zyngier Cc: Jens Axboe Cc: Michael Ellerman Cc: Keith Busch Cc: Peter Zijlstra Cc: Christoph Hellwig Link: http://lkml.kernel.org/r/20170619235444.537566163@linutronix.deSigned-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

5e385a6e - genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors

Mon, 04 Jul 2016 08:39:27 +0000

genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectorsThis is lifted from the blk-mq code and adopted to use the affinity maskconcept just introduced in the irq handling code. It tries to keep thealgorithm the same as the one current used by blk-mq, but improvementslike assining vectors on a per-node basis instead of just per siblingare possible with this simple move and refactoring.Signed-off-by: Christoph Hellwig Cc: linux-block@vger.kernel.orgCc: linux-pci@vger.kernel.orgCc: linux-nvme@lists.infradead.orgCc: axboe@fb.comCc: agordeev@redhat.comLink: http://lkml.kernel.org/r/1467621574-8277-7-git-send-email-hch@lst.deSigned-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

d17bf24e - genirq: Add a new generic IPI reservation code to irq core

Tue, 08 Dec 2015 13:20:19 +0000

genirq: Add a new generic IPI reservation code to irq coreAdd a generic mechanism to dynamically allocate an IPI. Depending on theunderlying implementation this creates either a single Linux irq or aconsective range of Linux irqs. The Linux irq is used later to send IPIs toother CPUs.[ tglx: Massaged the code and removed the 'consecutive mask' restriction for the single IRQ case ]Signed-off-by: Qais Yousef Cc: Cc: Cc: Cc: Cc: Cc: Cc: Qais Yousef Link: http://lkml.kernel.org/r/1449580830-23652-9-git-send-email-qais.yousef@imgtec.comSigned-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

f1e0bb0a - genirq: Introduce generic irq migration for cpu hotunplug

Thu, 24 Sep 2015 09:32:13 +0000

genirq: Introduce generic irq migration for cpu hotunplugARM and ARM64 have almost identical code for migrating interrupts oncpu hotunplug. Provide a generic version which can be used by both.The new code addresses a shortcoming in the ARM[64] variants whichfails to update the affinity change in some cases. The solution forthis is to use the core function irq_do_set_affinity() instead of opencoding it.[ tglx: Added copyright notice and license boilerplate. Rewrote subject and changelog. ]Signed-off-by: Yang Yingliang Acked-by: Russell King - ARM Linux Cc: Jiang Liu Cc: Marc Zyngier Cc: Mark Rutland Cc: Will Deacon Cc: Hanjun Guo Cc: Link: http://lkml.kernel.org/r/1443087135-17044-2-git-send-email-yangyingliang@huawei.comSigned-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

f3cf8bb0 - genirq: Add generic msi irq domain support

Wed, 12 Nov 2014 10:39:03 +0000

genirq: Add generic msi irq domain supportImplement the basic functions for MSI interrupt support withhierarchical interrupt domains.[ tglx: Extracted and combined from several patches ]Signed-off-by: Jiang Liu Cc: Bjorn Helgaas Cc: Grant Likely Cc: Marc Zyngier Cc: Yingjoe Chen Cc: Yijing Wang Signed-off-by: Thomas Gleixner List of files: /linux-6.15/kernel/irq/Makefile

08a543ad - irq: add irq_domain translation infrastructure

Tue, 26 Jul 2011 09:19:06 +0000

irq: add irq_domain translation infrastructureThis patch adds irq_domain infrastructure for translating fromhardware irq numbers to linux irqs. This is particularly importantfor architectures adding device tree support because the currentimplementation (excluding PowerPC and SPARC) cannot handletranslation for more than a single interrupt controller. irq_domainsupports device tree translation for any number of interruptcontrollers.This patch converts x86, Microblaze, ARM and MIPS to use irq_domainfor device tree irq translation. x86 is untested beyond compiling it,irq_domain is enabled for MIPS and Microblaze, but the old behaviour ispreserved until the core code is modified to actually register anirq_domain yet. On ARM it works and is required for much of the newARM device tree board support.PowerPC has /not/ been converted to use this new infrastructure. Itis still missing some features before it can replace the virqinfrastructure already in powerpc (see documentation onirq_domain_map/unmap for details). Followup patches will add themissing pieces and migrate PowerPC to use irq_domain.SPARC has its own method of managing interrupts from the device treeand is unaffected by this change.Acked-by: Ralf Baechle Signed-off-by: Grant Likely List of files: /linux-6.15/kernel/irq/Makefile

c42321c7 - genirq: Make generic irq chip depend on CONFIG_GENERIC_IRQ_CHIP

Mon, 02 May 2011 16:16:22 +0000

genirq: Make generic irq chip depend on CONFIG_GENERIC_IRQ_CHIPOnly compile it in when there are users.Signed-off-by: Thomas Gleixner Cc: linux-arm-kernel@lists.infradead.org List of files: /linux-6.15/kernel/irq/Makefile

7d828062 - genirq: Implement a generic interrupt chip

Sun, 03 Apr 2011 09:42:53 +0000

genirq: Implement a generic interrupt chipImplement a generic interrupt chip, which is configurable and is ableto handle the most common irq chip implementations.Signed-off-by: Thomas Gleixner Cc: linux-arm-kernel@lists.infradead.orgTested-by: H Hartley Sweeten Tested-by: Tony Lindgren Tested-by; Kevin Hilman List of files: /linux-6.15/kernel/irq/Makefile

78f90d91 - genirq: Remove the now unused sparse irq leftovers

Wed, 29 Sep 2010 15:18:47 +0000

genirq: Remove the now unused sparse irq leftoversThe move_irq_desc() function was only used due to the problem that theallocator did not free the old descriptors. So the descriptors had tobe moved in create_irq_nr(). That's history.The code would have never been able to move active interruptdescriptors on affinity settings. That can be done in a completelydifferent way w/o all this horror.Remove all of it.Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar List of files: /linux-6.15/kernel/irq/Makefile

3795de23 - genirq: Distangle kernel/irq/handle.c

Wed, 22 Sep 2010 15:09:43 +0000

genirq: Distangle kernel/irq/handle.ckernel/irq/handle.c has become a dumpground for random code in randomorder. Split out the irq descriptor management and the dummy irq_chipimplementation into separate files. Cleanup the include maze while atit.No code change.Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar List of files: /linux-6.15/kernel/irq/Makefile

15e957d0 - x86/irq: use move_irq_desc() in create_irq_nr()

Thu, 30 Apr 2009 08:17:50 +0000

x86/irq: use move_irq_desc() in create_irq_nr()move_irq_desc() will try to move irq_desc to the home node ifthe allocated one is not correct, in create_irq_nr().( This can happen on devices that are on different nodes that are using MSI, when drivers are loaded and unloaded randomly. )v2: fix non-smp buildv3: add NUMA_IRQ_DESC to eliminate #ifdefs[ Impact: improve irq descriptor locality on NUMA systems ]Signed-off-by: Yinghai Lu Cc: Andrew Morton Cc: Suresh Siddha Cc: "Eric W. Biederman" Cc: Rusty Russell LKML-Reference: <49F95EAE.2050903@kernel.org>Signed-off-by: Ingo Molnar List of files: /linux-6.15/kernel/irq/Makefile

fcef5911 - x86/irq: remove leftover code from NUMA_MIGRATE_IRQ_DESC

Tue, 28 Apr 2009 00:58:23 +0000

x86/irq: remove leftover code from NUMA_MIGRATE_IRQ_DESCThe original feature of migrating irq_desc dynamic was too fragileand was causing problems: it caused crashes on systems with lots ofcards with MSI-X when user-space irq-balancer was enabled.We now have new patches that create irq_desc according to devicenuma node. This patch removes the leftover bits of the dynamic balancer.[ Impact: remove dead code ]Signed-off-by: Yinghai Lu Cc: Andrew Morton Cc: Suresh Siddha Cc: "Eric W. Biederman" Cc: Rusty Russell LKML-Reference: <49F654AF.8000808@kernel.org>Signed-off-by: Ingo Molnar List of files: /linux-6.15/kernel/irq/Makefile

0a0c5168 - PM: Introduce functions for suspending and resuming device interrupts

Mon, 16 Mar 2009 21:33:49 +0000

PM: Introduce functions for suspending and resuming device interruptsIntroduce helper functions allowing us to prevent device drivers fromgetting any interrupts (without disabling interrupts on the CPU)during suspend (or hibernation) and to make them start to receiveinterrupts again during the subsequent resume. These functions make itpossible to keep timer interrupts enabled while the "late" suspend and"early" resume callbacks provided by device drivers are beingexecuted. In turn, this allows device drivers' "late" suspend and"early" resume callbacks to sleep, execute ACPI callbacks etc.The functions introduced here will be used to rework the handling ofinterrupts during suspend (hibernation) and resume. Namely,interrupts will only be disabled on the CPU right before suspendingsysdevs, while device drivers will be prevented from receivinginterrupts, with the help of the new helper function, before their"late" suspend callbacks run (and analogously during resume).Signed-off-by: Rafael J. Wysocki Acked-by: Ingo Molnar List of files: /linux-6.15/kernel/irq/Makefile