From 34ff636f322c6d5e4f0a52338fa63a7dff09a495 Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Sat, 18 Jul 2026 13:15:36 -0400 Subject: scftorture: Count single_rpc offline failures in statistics output scf_torture_stats_print() aggregates each invoker thread's counters into a local scf_statistics structure before printing, but the n_single_rpc_ofl field is missing from the aggregation loop. As a result, the "single_rpc_ofl" value printed in the statistics line is always zero, even when smp_call_function_single() invocations for the RPC test have failed due to offline CPUs and been counted by the invoker threads. Add the missing accumulation so that the printed value reflects the actual counts. Signed-off-by: Joel Fernandes Signed-off-by: Paul E. McKenney --- drivers/char/misc.c | 319 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 319 insertions(+) create mode 100644 drivers/char/misc.c (limited to 'drivers/char/misc.c') diff --git a/drivers/char/misc.c b/drivers/char/misc.c new file mode 100644 index 000000000..726516fb0 --- /dev/null +++ b/drivers/char/misc.c @@ -0,0 +1,319 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/drivers/char/misc.c + * + * Generic misc open routine by Johan Myreen + * + * Based on code from Linus + * + * Teemu Rantanen's Microsoft Busmouse support and Derrick Cole's + * changes incorporated into 0.97pl4 + * by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92) + * See busmouse.c for particulars. + * + * Made things a lot mode modular - easy to compile in just one or two + * of the misc drivers, as they are now completely independent. Linus. + * + * Support for loadable modules. 8-Sep-95 Philip Blundell + * + * Fixed a failing symbol register to free the device registration + * Alan Cox 21-Jan-96 + * + * Dynamic minors and /proc/mice by Alessandro Rubini. 26-Mar-96 + * + * Renamed to misc and miscdevice to be more accurate. Alan Cox 26-Mar-96 + * + * Handling of mouse minor numbers for kerneld: + * Idea by Jacques Gelinas , + * adapted by Bjorn Ekwall + * corrected by Alan Cox + * + * Changes for kmod (from kerneld): + * Cyrus Durgin + * + * Added devfs support. Richard Gooch 10-Jan-1998 + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Head entry for the doubly linked miscdevice list + */ +static LIST_HEAD(misc_list); +static DEFINE_MUTEX(misc_mtx); + +/* + * Assigned numbers. + */ +static DEFINE_IDA(misc_minors_ida); + +static int misc_minor_alloc(int minor) +{ + int ret = 0; + + if (minor == MISC_DYNAMIC_MINOR) { + /* allocate free id */ + ret = ida_alloc_range(&misc_minors_ida, MISC_DYNAMIC_MINOR + 1, + MINORMASK, GFP_KERNEL); + } else { + ret = ida_alloc_range(&misc_minors_ida, minor, minor, GFP_KERNEL); + } + return ret; +} + +static void misc_minor_free(int minor) +{ + ida_free(&misc_minors_ida, minor); +} + +#ifdef CONFIG_PROC_FS +static void *misc_seq_start(struct seq_file *seq, loff_t *pos) +{ + mutex_lock(&misc_mtx); + return seq_list_start(&misc_list, *pos); +} + +static void *misc_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_list_next(v, &misc_list, pos); +} + +static void misc_seq_stop(struct seq_file *seq, void *v) +{ + mutex_unlock(&misc_mtx); +} + +static int misc_seq_show(struct seq_file *seq, void *v) +{ + const struct miscdevice *p = list_entry(v, struct miscdevice, list); + + seq_printf(seq, "%3i %s\n", p->minor, p->name ? p->name : ""); + return 0; +} + + +static const struct seq_operations misc_seq_ops = { + .start = misc_seq_start, + .next = misc_seq_next, + .stop = misc_seq_stop, + .show = misc_seq_show, +}; +#endif + +static int misc_open(struct inode *inode, struct file *file) +{ + int minor = iminor(inode); + struct miscdevice *c = NULL, *iter; + int err = -ENODEV; + const struct file_operations *new_fops = NULL; + + mutex_lock(&misc_mtx); + + list_for_each_entry(iter, &misc_list, list) { + if (iter->minor != minor) + continue; + c = iter; + new_fops = fops_get(iter->fops); + break; + } + + /* Only request module for fixed minor code */ + if (!new_fops && minor < MISC_DYNAMIC_MINOR) { + mutex_unlock(&misc_mtx); + request_module("char-major-%d-%d", MISC_MAJOR, minor); + mutex_lock(&misc_mtx); + + list_for_each_entry(iter, &misc_list, list) { + if (iter->minor != minor) + continue; + c = iter; + new_fops = fops_get(iter->fops); + break; + } + } + + if (!new_fops) + goto fail; + + /* + * Place the miscdevice in the file's + * private_data so it can be used by the + * file operations, including f_op->open below + */ + file->private_data = c; + + err = 0; + replace_fops(file, new_fops); + if (file->f_op->open) + err = file->f_op->open(inode, file); +fail: + mutex_unlock(&misc_mtx); + return err; +} + +static char *misc_devnode(const struct device *dev, umode_t *mode) +{ + const struct miscdevice *c = dev_get_drvdata(dev); + + if (mode && c->mode) + *mode = c->mode; + if (c->nodename) + return kstrdup(c->nodename, GFP_KERNEL); + return NULL; +} + +static const struct class misc_class = { + .name = "misc", + .devnode = misc_devnode, +}; + +static const struct file_operations misc_fops = { + .owner = THIS_MODULE, + .open = misc_open, + .llseek = noop_llseek, +}; + +/** + * misc_register - register a miscellaneous device + * @misc: device structure + * + * Register a miscellaneous device with the kernel. If the minor + * number is set to %MISC_DYNAMIC_MINOR a minor number is assigned + * and placed in the minor field of the structure. For other cases + * the minor number requested is used. + * + * The structure passed is linked into the kernel and may not be + * destroyed until it has been unregistered. By default, an open() + * syscall to the device sets file->private_data to point to the + * structure. Drivers don't need open in fops for this. + * + * A zero is returned on success and a negative errno code for + * failure. + */ + +int misc_register(struct miscdevice *misc) +{ + dev_t dev; + int err = 0; + bool is_dynamic = (misc->minor == MISC_DYNAMIC_MINOR); + + if (misc->minor > MISC_DYNAMIC_MINOR) { + pr_err("Invalid fixed minor %d for miscdevice '%s'\n", + misc->minor, misc->name); + return -EINVAL; + } + + INIT_LIST_HEAD(&misc->list); + + mutex_lock(&misc_mtx); + + if (is_dynamic) { + int i = misc_minor_alloc(misc->minor); + + if (i < 0) { + err = -EBUSY; + goto out; + } + misc->minor = i; + } else { + struct miscdevice *c; + int i; + + list_for_each_entry(c, &misc_list, list) { + if (c->minor == misc->minor) { + err = -EBUSY; + goto out; + } + } + + i = misc_minor_alloc(misc->minor); + if (i < 0) { + err = -EBUSY; + goto out; + } + } + + dev = MKDEV(MISC_MAJOR, misc->minor); + + misc->this_device = + device_create_with_groups(&misc_class, misc->parent, dev, + misc, misc->groups, "%s", misc->name); + if (IS_ERR(misc->this_device)) { + misc_minor_free(misc->minor); + if (is_dynamic) { + misc->minor = MISC_DYNAMIC_MINOR; + } + err = PTR_ERR(misc->this_device); + goto out; + } + + /* + * Add it to the front, so that later devices can "override" + * earlier defaults + */ + list_add(&misc->list, &misc_list); + out: + mutex_unlock(&misc_mtx); + return err; +} +EXPORT_SYMBOL(misc_register); + +/** + * misc_deregister - unregister a miscellaneous device + * @misc: device to unregister + * + * Unregister a miscellaneous device that was previously + * successfully registered with misc_register(). + */ + +void misc_deregister(struct miscdevice *misc) +{ + mutex_lock(&misc_mtx); + list_del_init(&misc->list); + device_destroy(&misc_class, MKDEV(MISC_MAJOR, misc->minor)); + misc_minor_free(misc->minor); + if (misc->minor > MISC_DYNAMIC_MINOR) + misc->minor = MISC_DYNAMIC_MINOR; + mutex_unlock(&misc_mtx); +} +EXPORT_SYMBOL(misc_deregister); + +static int __init misc_init(void) +{ + int err; + struct proc_dir_entry *misc_proc_file; + + misc_proc_file = proc_create_seq("misc", 0, NULL, &misc_seq_ops); + err = class_register(&misc_class); + if (err) + goto fail_remove; + + err = __register_chrdev(MISC_MAJOR, 0, MINORMASK + 1, "misc", &misc_fops); + if (err < 0) + goto fail_printk; + return 0; + +fail_printk: + pr_err("unable to get major %d for misc devices\n", MISC_MAJOR); + class_unregister(&misc_class); +fail_remove: + if (misc_proc_file) + remove_proc_entry("misc", NULL); + return err; +} +subsys_initcall(misc_init); -- cgit v1.3.1