cregit-Linux how code gets into the kernel

Release 4.13 kernel/ksysfs.c

Directory: kernel
/*
 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
 *                   are not related to any other subsystem
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 * 
 * This file is release under the GPLv2
 *
 */

#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kexec.h>
#include <linux/profile.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/compiler.h>

#include <linux/rcupdate.h>	/* rcu_expedited and rcu_normal */


#define KERNEL_ATTR_RO(_name) \
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)


#define KERNEL_ATTR_RW(_name) \
static struct kobj_attribute _name##_attr = \
        __ATTR(_name, 0644, _name##_show, _name##_store)

/* current uevent sequence number */

static ssize_t uevent_seqnum_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum); }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers2982.86%466.67%
Andrew Morton514.29%116.67%
Greg Kroah-Hartman12.86%116.67%
Total35100.00%6100.00%

KERNEL_ATTR_RO(uevent_seqnum); #ifdef CONFIG_UEVENT_HELPER /* uevent helper program, used during early boot */
static ssize_t uevent_helper_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%s\n", uevent_helper); }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers30100.00%3100.00%
Total30100.00%3100.00%


static ssize_t uevent_helper_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { if (count+1 > UEVENT_HELPER_PATH_LEN) return -ENOENT; memcpy(uevent_helper, buf, count); uevent_helper[count] = '\0'; if (count && uevent_helper[count-1] == '\n') uevent_helper[count-1] = '\0'; return count; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers77100.00%3100.00%
Total77100.00%3100.00%

KERNEL_ATTR_RW(uevent_helper); #endif #ifdef CONFIG_PROFILING
static ssize_t profiling_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", prof_on); }

Contributors

PersonTokensPropCommitsCommitProp
Dave Hansen30100.00%1100.00%
Total30100.00%1100.00%


static ssize_t profiling_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { int ret; if (prof_on) return -EEXIST; /* * This eventually calls into get_option() which * has a ton of callers and is not const. It is * easiest to cast it away here. */ profile_setup((char *)buf); ret = profile_init(); if (ret) return ret; ret = create_proc_profile(); if (ret) return ret; return count; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Hansen72100.00%1100.00%
Total72100.00%1100.00%

KERNEL_ATTR_RW(profiling); #endif #ifdef CONFIG_KEXEC_CORE
static ssize_t kexec_loaded_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", !!kexec_image); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Moyer2371.88%150.00%
Kay Sievers928.12%150.00%
Total32100.00%2100.00%

KERNEL_ATTR_RO(kexec_loaded);
static ssize_t kexec_crash_loaded_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", kexec_crash_loaded()); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Moyer2064.52%133.33%
Kay Sievers929.03%133.33%
Petr Tesarik26.45%133.33%
Total31100.00%3100.00%

KERNEL_ATTR_RO(kexec_crash_loaded);
static ssize_t kexec_crash_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%zu\n", crash_get_memory_size()); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang31100.00%1100.00%
Total31100.00%1100.00%


static ssize_t kexec_crash_size_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { unsigned long cnt; int ret; if (kstrtoul(buf, 0, &cnt)) return -EINVAL; ret = crash_shrink_memory(cnt); return ret < 0 ? ret : count; }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang6298.41%150.00%
Jingoo Han11.59%150.00%
Total63100.00%2100.00%

KERNEL_ATTR_RW(kexec_crash_size); #endif /* CONFIG_KEXEC_CORE */ #ifdef CONFIG_CRASH_CORE
static ssize_t vmcoreinfo_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { phys_addr_t vmcore_base = paddr_vmcoreinfo_note(); return sprintf(buf, "%pa %x\n", &vmcore_base, (unsigned int)VMCOREINFO_NOTE_SIZE); }

Contributors

PersonTokensPropCommitsCommitProp
Ken'ichi Ohmichi2455.81%240.00%
Russell King920.93%120.00%
Kay Sievers920.93%120.00%
Xunlei Pang12.33%120.00%
Total43100.00%5100.00%

KERNEL_ATTR_RO(vmcoreinfo); #endif /* CONFIG_CRASH_CORE */ /* whether file capabilities are enabled */
static ssize_t fscaps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", file_caps_enabled); }

Contributors

PersonTokensPropCommitsCommitProp
Ludwig Nussel30100.00%1100.00%
Total30100.00%1100.00%

KERNEL_ATTR_RO(fscaps); #ifndef CONFIG_TINY_RCU int rcu_expedited;
static ssize_t rcu_expedited_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", READ_ONCE(rcu_expedited)); }

Contributors

PersonTokensPropCommitsCommitProp
Antti P. Miettinen3090.91%150.00%
Paul E. McKenney39.09%150.00%
Total33100.00%2100.00%


static ssize_t rcu_expedited_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { if (kstrtoint(buf, 0, &rcu_expedited)) return -EINVAL; return count; }

Contributors

PersonTokensPropCommitsCommitProp
Antti P. Miettinen43100.00%1100.00%
Total43100.00%1100.00%

KERNEL_ATTR_RW(rcu_expedited); int rcu_normal;
static ssize_t rcu_normal_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", READ_ONCE(rcu_normal)); }

Contributors

PersonTokensPropCommitsCommitProp
Paul E. McKenney33100.00%1100.00%
Total33100.00%1100.00%


static ssize_t rcu_normal_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { if (kstrtoint(buf, 0, &rcu_normal)) return -EINVAL; return count; }

Contributors

PersonTokensPropCommitsCommitProp
Paul E. McKenney43100.00%1100.00%
Total43100.00%1100.00%

KERNEL_ATTR_RW(rcu_normal); #endif /* #ifndef CONFIG_TINY_RCU */ /* * Make /sys/kernel/notes give the raw contents of our kernel .notes section. */ extern const void __start_notes __weak; extern const void __stop_notes __weak; #define notes_size (&__stop_notes - &__start_notes)
static ssize_t notes_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { memcpy(buf, &__start_notes + off, count); return count; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath4189.13%150.00%
Chris Wright510.87%150.00%
Total46100.00%2100.00%

static struct bin_attribute notes_attr __ro_after_init = { .attr = { .name = "notes", .mode = S_IRUGO, }, .read = &notes_read, }; struct kobject *kernel_kobj; EXPORT_SYMBOL_GPL(kernel_kobj); static struct attribute * kernel_attrs[] = { &fscaps_attr.attr, &uevent_seqnum_attr.attr, #ifdef CONFIG_UEVENT_HELPER &uevent_helper_attr.attr, #endif #ifdef CONFIG_PROFILING &profiling_attr.attr, #endif #ifdef CONFIG_KEXEC_CORE &kexec_loaded_attr.attr, &kexec_crash_loaded_attr.attr, &kexec_crash_size_attr.attr, #endif #ifdef CONFIG_CRASH_CORE &vmcoreinfo_attr.attr, #endif #ifndef CONFIG_TINY_RCU &rcu_expedited_attr.attr, &rcu_normal_attr.attr, #endif NULL }; static const struct attribute_group kernel_attr_group = { .attrs = kernel_attrs, };
static int __init ksysfs_init(void) { int error; kernel_kobj = kobject_create_and_add("kernel", NULL); if (!kernel_kobj) { error = -ENOMEM; goto exit; } error = sysfs_create_group(kernel_kobj, &kernel_attr_group); if (error) goto kset_exit; if (notes_size > 0) { notes_attr.size = notes_size; error = sysfs_create_bin_file(kernel_kobj, &notes_attr); if (error) goto group_exit; } return 0; group_exit: sysfs_remove_group(kernel_kobj, &kernel_attr_group); kset_exit: kobject_put(kernel_kobj); exit: return error; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman5348.62%350.00%
Kay Sievers2926.61%116.67%
Roland McGrath2321.10%116.67%
Dhaval Giani43.67%116.67%
Total109100.00%6100.00%

core_initcall(ksysfs_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers27225.14%410.81%
Dave Hansen12511.55%12.70%
Roland McGrath1059.70%12.70%
Paul E. McKenney1049.61%25.41%
Américo Wang1039.52%12.70%
Antti P. Miettinen867.95%12.70%
Jeff Moyer746.84%12.70%
Greg Kroah-Hartman645.91%513.51%
Ludwig Nussel444.07%12.70%
Ken'ichi Ohmichi343.14%25.41%
Hari Bathini121.11%12.70%
Michael Marineau100.92%12.70%
Russell King90.83%12.70%
Paul Gortmaker70.65%38.11%
Dhaval Giani70.65%12.70%
Chris Wright50.46%12.70%
Andrew Morton50.46%12.70%
Gideon Israel Dsouza50.46%12.70%
David Howells20.18%12.70%
Dave Young20.18%12.70%
Petr Tesarik20.18%12.70%
Thadeu Lima de Souza Cascardo10.09%12.70%
Bhumika Goyal10.09%12.70%
Arvind Yadav10.09%12.70%
Jingoo Han10.09%12.70%
Xunlei Pang10.09%12.70%
Total1082100.00%37100.00%
Directory: kernel
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