diff options
31 files changed, 201 insertions, 179 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-irq b/Documentation/ABI/testing/sysfs-kernel-irq index eb074b100986..8910d0c4bcd8 100644 --- a/Documentation/ABI/testing/sysfs-kernel-irq +++ b/Documentation/ABI/testing/sysfs-kernel-irq @@ -51,3 +51,10 @@ Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek <kraig@google.com> Description: The type of the interrupt. Either the string 'level' or 'edge'. + +What: /sys/kernel/irq/<irq>/wakeup +Date: March 2018 +KernelVersion: 4.17 +Contact: Andy Shevchenko <andriy.shevchenko@linux.intel.com> +Description: The wakeup state of the interrupt. Either the string + 'enabled' or 'disabled'. diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 04807c7f64cc..148865de1692 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -33,6 +33,7 @@ config RISCV select MODULES_USE_ELF_RELA if MODULES select THREAD_INFO_IN_TASK select RISCV_TIMER + select GENERIC_IRQ_MULTI_HANDLER config MMU def_bool y diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild index 4286a5f83876..1e5fd280fb4d 100644 --- a/arch/riscv/include/asm/Kbuild +++ b/arch/riscv/include/asm/Kbuild @@ -15,6 +15,7 @@ generic-y += fcntl.h generic-y += futex.h generic-y += hardirq.h generic-y += hash.h +generic-y += handle_irq.h generic-y += hw_irq.h generic-y += ioctl.h generic-y += ioctls.h diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 56fa592cfa34..9aaf6c986771 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -167,10 +167,9 @@ ENTRY(handle_exception) bge s4, zero, 1f /* Handle interrupts */ - slli a0, s4, 1 - srli a0, a0, 1 - move a1, sp /* pt_regs */ - tail do_IRQ + move a0, sp /* pt_regs */ + REG_L a1, handle_arch_irq + jr a1 1: /* Exceptions run with interrupts enabled */ csrs sstatus, SR_SIE diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c index 328718e8026e..b74cbfbce2d0 100644 --- a/arch/riscv/kernel/irq.c +++ b/arch/riscv/kernel/irq.c @@ -24,16 +24,3 @@ void __init init_IRQ(void) { irqchip_init(); } - -asmlinkage void __irq_entry do_IRQ(unsigned int cause, struct pt_regs *regs) -{ -#ifdef CONFIG_RISCV_INTC - /* - * FIXME: We don't want a direct call to riscv_intc_irq here. The plan - * is to put an IRQ domain here and let the interrupt controller - * register with that, but I poked around the arm64 code a bit and - * there might be a better way to do it (ie, something fully generic). - */ - riscv_intc_irq(cause, regs); -#endif -} diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 8c10b0562e75..621c517b325c 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -86,10 +86,10 @@ struct nfs_direct_req { struct nfs_direct_mirror mirrors[NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX]; int mirror_count; + loff_t io_start; /* Start offset for I/O */ ssize_t count, /* bytes actually processed */ max_count, /* max expected count */ bytes_left, /* bytes left to be sent */ - io_start, /* start of IO */ error; /* any reported error */ struct completion completion; /* wait for i/o completion */ diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index c13e826614b5..ee723aa153a3 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -292,8 +292,11 @@ pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) { - struct inode *inode = lo->plh_inode; + struct inode *inode; + if (!lo) + return; + inode = lo->plh_inode; pnfs_layoutreturn_before_put_layout_hdr(lo); if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { @@ -1241,10 +1244,12 @@ retry: spin_lock(&ino->i_lock); lo = nfsi->layout; if (!lo || !pnfs_layout_is_valid(lo) || - test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) + test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { + lo = NULL; goto out_noroc; + } + pnfs_get_layout_hdr(lo); if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { - pnfs_get_layout_hdr(lo); spin_unlock(&ino->i_lock); wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); @@ -1312,10 +1317,12 @@ out_noroc: struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; if (ld->prepare_layoutreturn) ld->prepare_layoutreturn(args); + pnfs_put_layout_hdr(lo); return true; } if (layoutreturn) pnfs_send_layoutreturn(lo, &stateid, iomode, true); + pnfs_put_layout_hdr(lo); return false; } diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 7428a669d7a7..e7d8ceae8f26 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1876,40 +1876,43 @@ int nfs_generic_commit_list(struct inode *inode, struct list_head *head, return status; } -int nfs_commit_inode(struct inode *inode, int how) +static int __nfs_commit_inode(struct inode *inode, int how, + struct writeback_control *wbc) { LIST_HEAD(head); struct nfs_commit_info cinfo; int may_wait = how & FLUSH_SYNC; - int error = 0; - int res; + int ret, nscan; nfs_init_cinfo_from_inode(&cinfo, inode); nfs_commit_begin(cinfo.mds); - res = nfs_scan_commit(inode, &head, &cinfo); - if (res) - error = nfs_generic_commit_list(inode, &head, how, &cinfo); + for (;;) { + ret = nscan = nfs_scan_commit(inode, &head, &cinfo); + if (ret <= 0) + break; + ret = nfs_generic_commit_list(inode, &head, how, &cinfo); + if (ret < 0) + break; + ret = 0; + if (wbc && wbc->sync_mode == WB_SYNC_NONE) { + if (nscan < wbc->nr_to_write) + wbc->nr_to_write -= nscan; + else + wbc->nr_to_write = 0; + } + if (nscan < INT_MAX) + break; + cond_resched(); + } nfs_commit_end(cinfo.mds); - if (res == 0) - return res; - if (error < 0) - goto out_error; - if (!may_wait) - goto out_mark_dirty; - error = wait_on_commit(cinfo.mds); - if (error < 0) - return error; - return res; -out_error: - res = error; - /* Note: If we exit without ensuring that the commit is complete, - * we must mark the inode as dirty. Otherwise, future calls to - * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure - * that the data is on the disk. - */ -out_mark_dirty: - __mark_inode_dirty(inode, I_DIRTY_DATASYNC); - return res; + if (ret || !may_wait) + return ret; + return wait_on_commit(cinfo.mds); +} + +int nfs_commit_inode(struct inode *inode, int how) +{ + return __nfs_commit_inode(inode, how, NULL); } EXPORT_SYMBOL_GPL(nfs_commit_inode); @@ -1919,11 +1922,11 @@ int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) int flags = FLUSH_SYNC; int ret = 0; - /* no commits means nothing needs to be done */ - if (!atomic_long_read(&nfsi->commit_info.ncommit)) - return ret; - if (wbc->sync_mode == WB_SYNC_NONE) { + /* no commits means nothing needs to be done */ + if (!atomic_long_read(&nfsi->commit_info.ncommit)) + goto check_requests_outstanding; + /* Don't commit yet if this is a non-blocking flush and there * are a lot of outstanding writes for this mapping. */ @@ -1934,16 +1937,16 @@ int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) flags = 0; } - ret = nfs_commit_inode(inode, flags); - if (ret >= 0) { - if (wbc->sync_mode == WB_SYNC_NONE) { - if (ret < wbc->nr_to_write) - wbc->nr_to_write -= ret; - else - wbc->nr_to_write = 0; - } - return 0; - } + ret = __nfs_commit_inode(inode, flags, wbc); + if (!ret) { + if (flags & FLUSH_SYNC) + return 0; + } else if (atomic_long_read(&nfsi->commit_info.ncommit)) + goto out_mark_dirty; + +check_requests_outstanding: + if (!atomic_read(&nfsi->commit_info.rpcs_out)) + return ret; out_mark_dirty: __mark_inode_dirty(inode, I_DIRTY_DATASYNC); return ret; diff --git a/include/linux/irq.h b/include/linux/irq.h index a0231e96a578..65916a305f3d 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -10,18 +10,13 @@ * Thanks. --rmk */ -#include <linux/smp.h> -#include <linux/linkage.h> #include <linux/cache.h> #include <linux/spinlock.h> #include <linux/cpumask.h> -#include <linux/gfp.h> #include <linux/irqhandler.h> #include <linux/irqreturn.h> #include <linux/irqnr.h> -#include <linux/errno.h> #include <linux/topology.h> -#include <linux/wait.h> #include <linux/io.h> #include <linux/slab.h> @@ -1170,4 +1165,22 @@ int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest); int ipi_send_single(unsigned int virq, unsigned int cpu); int ipi_send_mask(unsigned int virq, const struct cpumask *dest); +#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER +/* + * Registers a generic IRQ handling function as the top-level IRQ handler in + * the system, which is generally the first C code called from an assembly + * architecture-specific interrupt handler. + * + * Returns 0 on success, or -EBUSY if an IRQ handler has already been + * registered. + */ +int __init set_handle_irq(void (*handle_irq)(struct pt_regs *)); + +/* + * Allows interrupt handlers to find the irqchip that's been registered as the + * top-level IRQ handler. + */ +extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init; +#endif + #endif /* _LINUX_IRQ_H */ diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 6fc87ccda1d7..5f3e2baefca9 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -132,3 +132,8 @@ config GENERIC_IRQ_DEBUGFS If you don't know what to do here, say N. endmenu + +config GENERIC_IRQ_MULTI_HANDLER + bool + help + Allow to specify the low level IRQ handler at run time. diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c index 8c82ea26e837..16cbf6beb276 100644 --- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -1,7 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/autoprobe.c - * * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains the interrupt probing code and driver APIs. diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index c69357a43849..a2b3d9de999c 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -1,13 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/chip.c - * * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner, Russell King * - * This file contains the core interrupt handling code, for irq-chip - * based architectures. - * - * Detailed information is available in Documentation/core-api/genericirq.rst + * This file contains the core interrupt handling code, for irq-chip based + * architectures. Detailed information is available in + * Documentation/core-api/genericirq.rst */ #include <linux/irq.h> diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c index 9eb09aef0313..5b1072e394b2 100644 --- a/kernel/irq/cpuhotplug.c +++ b/kernel/irq/cpuhotplug.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Generic cpu hotunplug interrupt migration code copied from the * arch/arm implementation diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index acfaaef8672a..4dadeb3d6666 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -1,8 +1,6 @@ -/* - * Copyright 2017 Thomas Gleixner <tglx@linutronix.de> - * - * This file is licensed under the GPL V2. - */ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2017 Thomas Gleixner <tglx@linutronix.de> + #include <linux/irqdomain.h> #include <linux/irq.h> #include <linux/uaccess.h> diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c index 194c506d9d20..6a682c229e10 100644 --- a/kernel/irq/devres.c +++ b/kernel/irq/devres.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 #include <linux/module.h> #include <linux/interrupt.h> #include <linux/device.h> diff --git a/kernel/irq/dummychip.c b/kernel/irq/dummychip.c index 326a67f2410b..0b0cdf206dc4 100644 --- a/kernel/irq/dummychip.c +++ b/kernel/irq/dummychip.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner, Russell King diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c index 508c03dfef25..e2999a070a99 100644 --- a/kernel/irq/generic-chip.c +++ b/kernel/irq/generic-chip.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Library implementing the most common irq chip callback functions * diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 79f987b942b8..38554bc35375 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -1,12 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/handle.c - * * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner, Russell King * - * This file contains the core interrupt handling code. - * - * Detailed information is available in Documentation/core-api/genericirq.rst + * This file contains the core interrupt handling code. Detailed + * information is available in Documentation/core-api/genericirq.rst * */ @@ -20,6 +18,10 @@ #include "internals.h" +#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER +void (*handle_arch_irq)(struct pt_regs *) __ro_after_init; +#endif + /** * handle_bad_irq - handle spurious and unhandled irqs * @desc: description of the interrupt @@ -207,3 +209,14 @@ irqreturn_t handle_irq_event(struct irq_desc *desc) irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS); return ret; } + +#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER +int __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) +{ + if (handle_arch_irq) + return -EBUSY; + + handle_arch_irq = handle_irq; + return 0; +} +#endif diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c index 259a22aa9934..8b778e37dc6d 100644 --- a/kernel/irq/ipi.c +++ b/kernel/irq/ipi.c @@ -1,6 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/ipi.c - * * Copyright (C) 2015 Imagination Technologies Ltd * Author: Qais Yousef <qais.yousef@imgtec.com> * diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c index 24caabf1a0f7..fc4f361a86bb 100644 --- a/kernel/irq/irq_sim.c +++ b/kernel/irq/irq_sim.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl> * @@ -7,6 +8,7 @@ * option) any later version. */ +#include <linux/slab.h> #include <linux/irq_sim.h> #include <linux/irq.h> @@ -49,7 +51,8 @@ static void irq_sim_handle_irq(struct irq_work *work) * @sim: The interrupt simulator object to initialize. * @num_irqs: Number of interrupts to allocate * - * Returns 0 on success and a negative error number on failure. + * On success: return the base of the allocated interrupt range. + * On failure: a negative errno. */ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) { @@ -78,7 +81,7 @@ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq); sim->irq_count = num_irqs; - return 0; + return sim->irq_base; } EXPORT_SYMBOL_GPL(irq_sim_init); @@ -110,7 +113,8 @@ static void devm_irq_sim_release(struct device *dev, void *res) * @sim: The interrupt simulator object to initialize. * @num_irqs: Number of interrupts to allocate * - * Returns 0 on success and a negative error number on failure. + * On success: return the base of the allocated interrupt range. + * On failure: a negative errno. */ int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, unsigned int num_irqs) @@ -123,7 +127,7 @@ int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, return -ENOMEM; rv = irq_sim_init(sim, num_irqs); - if (rv) { + if (rv < 0) { devres_free(dr); return rv; } @@ -131,7 +135,7 @@ int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, dr->sim = sim; devres_add(dev, dr); - return 0; + return rv; } EXPORT_SYMBOL_GPL(devm_irq_sim_init); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 49b54e9979cc..afc7f902d74a 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -1,10 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner, Russell King * - * This file contains the interrupt descriptor management code - * - * Detailed information is available in Documentation/core-api/genericirq.rst + * This file contains the interrupt descriptor management code. Detailed + * information is available in Documentation/core-api/genericirq.rst * */ #include <linux/irq.h> @@ -210,6 +210,22 @@ static ssize_t type_show(struct kobject *kobj, } IRQ_ATTR_RO(type); +static ssize_t wakeup_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); + ssize_t ret = 0; + + raw_spin_lock_irq(&desc->lock); + ret = sprintf(buf, "%s\n", + irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled"); + raw_spin_unlock_irq(&desc->lock); + + return ret; + +} +IRQ_ATTR_RO(wakeup); + static ssize_t name_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -253,6 +269,7 @@ static struct attribute *irq_attrs[] = { &chip_name_attr.attr, &hwirq_attr.attr, &type_attr.attr, + &wakeup_attr.attr, &name_attr.attr, &actions_attr.attr, NULL diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 82b8b18ee1eb..5d9fc01b60a6 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1,3 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0 + #define pr_fmt(fmt) "irq: " fmt #include <linux/acpi.h> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 0f922729bab9..e3336d904f64 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1,6 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/manage.c - * * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006 Thomas Gleixner * @@ -855,10 +854,14 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) * This code is triggered unconditionally. Check the affinity * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out. */ - if (cpumask_available(desc->irq_common_data.affinity)) - cpumask_copy(mask, desc->irq_common_data.affinity); - else + if (cpumask_available(desc->irq_common_data.affinity)) { + const struct cpumask *m; + + m = irq_data_get_effective_affinity_mask(&desc->irq_data); + cpumask_copy(mask, m); + } else { valid = false; + } raw_spin_unlock_irq(&desc->lock); if (valid) @@ -1519,9 +1522,9 @@ EXPORT_SYMBOL_GPL(setup_irq); * Internal function to unregister an irqaction - used to free * regular and special interrupts that are part of the architecture. */ -static struct irqaction *__free_irq(unsigned int irq, void *dev_id) +static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id) { - struct irq_desc *desc = irq_to_desc(irq); + unsigned irq = desc->irq_data.irq; struct irqaction *action, **action_ptr; unsigned long flags; @@ -1651,7 +1654,7 @@ void remove_irq(unsigned int irq, struct irqaction *act) struct irq_desc *desc = irq_to_desc(irq); if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc))) - __free_irq(irq, act->dev_id); + __free_irq(desc, act->dev_id); } EXPORT_SYMBOL_GPL(remove_irq); @@ -1685,7 +1688,7 @@ const void *free_irq(unsigned int irq, void *dev_id) desc->affinity_notify = NULL; #endif - action = __free_irq(irq, dev_id); + action = __free_irq(desc, dev_id); if (!action) return NULL; diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c index 4c5770407031..5092494bf261 100644 --- a/kernel/irq/matrix.c +++ b/kernel/irq/matrix.c @@ -1,8 +1,6 @@ -/* - * Copyright (C) 2017 Thomas Gleixner <tglx@linutronix.de> - * - * SPDX-License-Identifier: GPL-2.0 - */ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2017 Thomas Gleixner <tglx@linutronix.de> + #include <linux/spinlock.h> #include <linux/seq_file.h> #include <linux/bitmap.h> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 2f3c4f5382cc..2a8571f72b17 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -1,6 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/msi.c - * * Copyright (C) 2014 Intel Corp. * Author: Jiang Liu <jiang.liu@linux.intel.com> * diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index 6bd9b58429cc..d6961d3c6f9e 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -1,6 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/pm.c - * * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. * * This file contains power management functions related to interrupts. diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index e8f374971e37..7cb091d81d91 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -1,7 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/proc.c - * * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains the /proc/irq/ handling code. diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c index 1d08f45135c2..95414ad3506a 100644 --- a/kernel/irq/resend.c +++ b/kernel/irq/resend.c @@ -1,7 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/resend.c - * * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner * diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index 6cdecc6f4c53..d867d6ddafdd 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -1,7 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 /* - * linux/kernel/irq/spurious.c - * * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains spurious interrupt handling. diff --git a/kernel/irq/timings.c b/kernel/irq/timings.c index e0923fa4927a..1e4cb63a5c82 100644 --- a/kernel/irq/timings.c +++ b/kernel/irq/timings.c @@ -1,13 +1,6 @@ -/* - * linux/kernel/irq/timings.c - * - * Copyright (C) 2016, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2016, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> + #include <linux/kernel.h> #include <linux/percpu.h> #include <linux/slab.h> diff --git a/kernel/softirq.c b/kernel/softirq.c index 24d243ef8e71..177de3640c78 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -460,40 +460,46 @@ struct tasklet_head { static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec); static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec); -void __tasklet_schedule(struct tasklet_struct *t) +static void __tasklet_schedule_common(struct tasklet_struct *t, + struct tasklet_head __percpu *headp, + unsigned int softirq_nr) { + struct tasklet_head *head; unsigned long flags; local_irq_save(flags); + head = this_cpu_ptr(headp); t->next = NULL; - *__this_cpu_read(tasklet_vec.tail) = t; - __this_cpu_write(tasklet_vec.tail, &(t->next)); - raise_softirq_irqoff(TASKLET_SOFTIRQ); + *head->tail = t; + head->tail = &(t->next); + raise_softirq_irqoff(softirq_nr); local_irq_restore(flags); } + +void __tasklet_schedule(struct tasklet_struct *t) +{ + __tasklet_schedule_common(t, &tasklet_vec, + TASKLET_SOFTIRQ); +} EXPORT_SYMBOL(__tasklet_schedule); void __tasklet_hi_schedule(struct tasklet_struct *t) { - unsigned long flags; - - local_irq_save(flags); - t->next = NULL; - *__this_cpu_read(tasklet_hi_vec.tail) = t; - __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); - raise_softirq_irqoff(HI_SOFTIRQ); - local_irq_restore(flags); + __tasklet_schedule_common(t, &tasklet_hi_vec, + HI_SOFTIRQ); } EXPORT_SYMBOL(__tasklet_hi_schedule); -static __latent_entropy void tasklet_action(struct softirq_action *a) +static void tasklet_action_common(struct softirq_action *a, + struct tasklet_head *tl_head, + unsigned int softirq_nr) { struct tasklet_struct *list; local_irq_disable(); - list = __this_cpu_read(tasklet_vec.head); - __this_cpu_write(tasklet_vec.head, NULL); - __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head)); + list = tl_head->head; + tl_head->head = NULL; + tl_head->tail = &tl_head->head; local_irq_enable(); while (list) { @@ -515,47 +521,21 @@ static __latent_entropy void tasklet_action(struct softirq_action *a) local_irq_disable(); t->next = NULL; - *__this_cpu_read(tasklet_vec.tail) = t; - __this_cpu_write(tasklet_vec.tail, &(t->next)); - __raise_softirq_irqoff(TASKLET_SOFTIRQ); + *tl_head->tail = t; + tl_head->tail = &t->next; + __raise_softirq_irqoff(softirq_nr); local_irq_enable(); } } -static __latent_entropy void tasklet_hi_action(struct softirq_action *a) +static __latent_entropy void tasklet_action(struct softirq_action *a) { - struct tasklet_struct *list; - - local_irq_disable(); - list = __this_cpu_read(tasklet_hi_vec.head); - __this_cpu_write(tasklet_hi_vec.head, NULL); - __this_cpu_write(tasklet_hi_vec.tail, this_cpu_ptr(&tasklet_hi_vec.head)); - local_irq_enable(); - - while (list) { - struct tasklet_struct *t = list; - - list = list->next; - - if (tasklet_trylock(t)) { - if (!atomic_read(&t->count)) { - if (!test_and_clear_bit(TASKLET_STATE_SCHED, - &t->state)) - BUG(); - t->func(t->data); - tasklet_unlock(t); - continue; - } - tasklet_unlock(t); - } + tasklet_action_common(a, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ); +} - local_irq_disable(); - t->next = NULL; - *__this_cpu_read(tasklet_hi_vec.tail) = t; - __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); - __raise_softirq_irqoff(HI_SOFTIRQ); - local_irq_enable(); - } +static __latent_entropy void tasklet_hi_action(struct softirq_action *a) +{ + tasklet_action_common(a, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ); } void tasklet_init(struct tasklet_struct *t, |