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![Paul Gortmaker](/assets/img/avatar_default.png)
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0
("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
This removes all the remaining one-off uses of the __cpuinit macros
from all C files in the drivers/* directory.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
196 lines
5.2 KiB
C
196 lines
5.2 KiB
C
/*
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* driver/base/topology.c - Populate sysfs with cpu topology information
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*
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* Written by: Zhang Yanmin, Intel Corporation
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*
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* Copyright (C) 2006, Intel Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/topology.h>
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#define define_one_ro_named(_name, _func) \
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static DEVICE_ATTR(_name, 0444, _func, NULL)
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#define define_one_ro(_name) \
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static DEVICE_ATTR(_name, 0444, show_##_name, NULL)
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#define define_id_show_func(name) \
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static ssize_t show_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return sprintf(buf, "%d\n", topology_##name(cpu)); \
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}
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#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
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defined(topology_book_cpumask)
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static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
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{
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ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
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int n = 0;
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if (len > 1) {
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n = type?
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cpulist_scnprintf(buf, len-2, mask) :
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cpumask_scnprintf(buf, len-2, mask);
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buf[n++] = '\n';
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buf[n] = '\0';
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}
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return n;
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}
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#endif
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#ifdef arch_provides_topology_pointers
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(0, topology_##name(cpu), buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(1, topology_##name(cpu), buf); \
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}
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#else
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return show_cpumap(0, topology_##name(dev->id), buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return show_cpumap(1, topology_##name(dev->id), buf); \
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}
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#endif
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#define define_siblings_show_func(name) \
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define_siblings_show_map(name); define_siblings_show_list(name)
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define_id_show_func(physical_package_id);
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define_one_ro(physical_package_id);
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define_id_show_func(core_id);
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define_one_ro(core_id);
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define_siblings_show_func(thread_cpumask);
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define_one_ro_named(thread_siblings, show_thread_cpumask);
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define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
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define_siblings_show_func(core_cpumask);
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define_one_ro_named(core_siblings, show_core_cpumask);
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define_one_ro_named(core_siblings_list, show_core_cpumask_list);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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define_one_ro(book_id);
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define_siblings_show_func(book_cpumask);
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define_one_ro_named(book_siblings, show_book_cpumask);
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define_one_ro_named(book_siblings_list, show_book_cpumask_list);
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#endif
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static struct attribute *default_attrs[] = {
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&dev_attr_physical_package_id.attr,
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&dev_attr_core_id.attr,
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&dev_attr_thread_siblings.attr,
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&dev_attr_thread_siblings_list.attr,
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&dev_attr_core_siblings.attr,
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&dev_attr_core_siblings_list.attr,
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#ifdef CONFIG_SCHED_BOOK
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&dev_attr_book_id.attr,
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&dev_attr_book_siblings.attr,
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&dev_attr_book_siblings_list.attr,
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#endif
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NULL
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};
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static struct attribute_group topology_attr_group = {
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.attrs = default_attrs,
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.name = "topology"
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};
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/* Add/Remove cpu_topology interface for CPU device */
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static int topology_add_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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return sysfs_create_group(&dev->kobj, &topology_attr_group);
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}
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static void topology_remove_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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sysfs_remove_group(&dev->kobj, &topology_attr_group);
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}
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static int topology_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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int rc = 0;
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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rc = topology_add_dev(cpu);
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break;
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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topology_remove_dev(cpu);
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break;
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}
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return notifier_from_errno(rc);
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}
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static int topology_sysfs_init(void)
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{
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int cpu;
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int rc;
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for_each_online_cpu(cpu) {
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rc = topology_add_dev(cpu);
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if (rc)
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return rc;
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}
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hotcpu_notifier(topology_cpu_callback, 0);
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return 0;
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}
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device_initcall(topology_sysfs_init);
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