diff options
Diffstat (limited to 'kernel/ksysfs.c')
| -rw-r--r-- | kernel/ksysfs.c | 112 |
1 files changed, 34 insertions, 78 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 2df00b789b90..a9e6354d9e25 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -12,7 +12,7 @@ #include <linux/sysfs.h> #include <linux/export.h> #include <linux/init.h> -#include <linux/kexec.h> +#include <linux/vmcore_info.h> #include <linux/profile.h> #include <linux/stat.h> #include <linux/sched.h> @@ -39,7 +39,7 @@ static struct kobj_attribute _name##_attr = __ATTR_RW(_name) 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); + return sysfs_emit(buf, "%llu\n", (u64)atomic64_read(&uevent_seqnum)); } KERNEL_ATTR_RO(uevent_seqnum); @@ -51,12 +51,20 @@ static ssize_t cpu_byteorder_show(struct kobject *kobj, } KERNEL_ATTR_RO(cpu_byteorder); +/* address bits */ +static ssize_t address_bits_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%zu\n", sizeof(void *) * 8 /* CHAR_BIT */); +} +KERNEL_ATTR_RO(address_bits); + #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); + return sysfs_emit(buf, "%s\n", uevent_helper); } static ssize_t uevent_helper_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -77,14 +85,21 @@ KERNEL_ATTR_RW(uevent_helper); static ssize_t profiling_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", prof_on); + return sysfs_emit(buf, "%d\n", prof_on); } static ssize_t profiling_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { int ret; + static DEFINE_MUTEX(lock); + /* + * We need serialization, for profile_setup() initializes prof_on + * value and profile_init() must not reallocate prof_buffer after + * once allocated. + */ + guard(mutex)(&lock); if (prof_on) return -EEXIST; /* @@ -104,66 +119,24 @@ static ssize_t profiling_store(struct kobject *kobj, 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); -} -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()); -} -KERNEL_ATTR_RO(kexec_crash_loaded); - -static ssize_t kexec_crash_size_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -{ - ssize_t size = crash_get_memory_size(); - - if (size < 0) - return size; - - return sprintf(buf, "%zd\n", size); -} -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; -} -KERNEL_ATTR_RW(kexec_crash_size); - -#endif /* CONFIG_KEXEC_CORE */ - -#ifdef CONFIG_CRASH_CORE +#ifdef CONFIG_VMCORE_INFO 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); + return sysfs_emit(buf, "%pa %x\n", &vmcore_base, + (unsigned int)VMCOREINFO_NOTE_SIZE); } KERNEL_ATTR_RO(vmcoreinfo); -#endif /* CONFIG_CRASH_CORE */ +#endif /* CONFIG_VMCORE_INFO */ /* 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); + return sysfs_emit(buf, "%d\n", file_caps_enabled); } KERNEL_ATTR_RO(fscaps); @@ -172,7 +145,7 @@ 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)); + return sysfs_emit(buf, "%d\n", READ_ONCE(rcu_expedited)); } static ssize_t rcu_expedited_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -189,7 +162,7 @@ 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)); + return sysfs_emit(buf, "%d\n", READ_ONCE(rcu_normal)); } static ssize_t rcu_normal_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -206,25 +179,11 @@ KERNEL_ATTR_RW(rcu_normal); /* * 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; +extern const void __start_notes; +extern const void __stop_notes; #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; -} - -static struct bin_attribute notes_attr __ro_after_init = { - .attr = { - .name = "notes", - .mode = S_IRUGO, - }, - .read = ¬es_read, -}; +static __ro_after_init BIN_ATTR_SIMPLE_RO(notes); struct kobject *kernel_kobj; EXPORT_SYMBOL_GPL(kernel_kobj); @@ -233,18 +192,14 @@ static struct attribute * kernel_attrs[] = { &fscaps_attr.attr, &uevent_seqnum_attr.attr, &cpu_byteorder_attr.attr, + &address_bits_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 +#ifdef CONFIG_VMCORE_INFO &vmcoreinfo_attr.attr, #endif #ifndef CONFIG_TINY_RCU @@ -272,8 +227,9 @@ static int __init ksysfs_init(void) goto kset_exit; if (notes_size > 0) { - notes_attr.size = notes_size; - error = sysfs_create_bin_file(kernel_kobj, ¬es_attr); + bin_attr_notes.private = (void *)&__start_notes; + bin_attr_notes.size = notes_size; + error = sysfs_create_bin_file(kernel_kobj, &bin_attr_notes); if (error) goto group_exit; } |