Linux 6.9-rc1

[linux-2.6-microblaze.git] / kernel / ksysfs.c

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index b1292a5..495b69a 100644 (file)
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
  */
 
+#include <asm/byteorder.h>
 #include <linux/kobject.h>
 #include <linux/string.h>
 #include <linux/sysfs.h>
@@ -20,6 +21,14 @@
 
 #include <linux/rcupdate.h>    /* rcu_expedited and rcu_normal */
 
+#if defined(__LITTLE_ENDIAN)
+#define CPU_BYTEORDER_STRING   "little"
+#elif defined(__BIG_ENDIAN)
+#define CPU_BYTEORDER_STRING   "big"
+#else
+#error Unknown byteorder
+#endif
+
 #define KERNEL_ATTR_RO(_name) \
 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
 
@@ -30,16 +39,32 @@ 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);
 
+/* cpu byteorder */
+static ssize_t cpu_byteorder_show(struct kobject *kobj,
+                                 struct kobj_attribute *attr, char *buf)
+{
+       return sysfs_emit(buf, "%s\n", CPU_BYTEORDER_STRING);
+}
+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,
@@ -60,7 +85,7 @@ 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,
@@ -91,21 +116,27 @@ KERNEL_ATTR_RW(profiling);
 static ssize_t kexec_loaded_show(struct kobject *kobj,
                                 struct kobj_attribute *attr, char *buf)
 {
-       return sprintf(buf, "%d\n", !!kexec_image);
+       return sysfs_emit(buf, "%d\n", !!kexec_image);
 }
 KERNEL_ATTR_RO(kexec_loaded);
 
+#ifdef CONFIG_CRASH_DUMP
 static ssize_t kexec_crash_loaded_show(struct kobject *kobj,
                                       struct kobj_attribute *attr, char *buf)
 {
-       return sprintf(buf, "%d\n", kexec_crash_loaded());
+       return sysfs_emit(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)
 {
-       return sprintf(buf, "%zu\n", crash_get_memory_size());
+       ssize_t size = crash_get_memory_size();
+
+       if (size < 0)
+               return size;
+
+       return sysfs_emit(buf, "%zd\n", size);
 }
 static ssize_t kexec_crash_size_store(struct kobject *kobj,
                                   struct kobj_attribute *attr,
@@ -122,26 +153,39 @@ static ssize_t kexec_crash_size_store(struct kobject *kobj,
 }
 KERNEL_ATTR_RW(kexec_crash_size);
 
+#endif /* CONFIG_CRASH_DUMP*/
 #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 */
+#ifdef CONFIG_CRASH_HOTPLUG
+static ssize_t crash_elfcorehdr_size_show(struct kobject *kobj,
+                              struct kobj_attribute *attr, char *buf)
+{
+       unsigned int sz = crash_get_elfcorehdr_size();
+
+       return sysfs_emit(buf, "%u\n", sz);
+}
+KERNEL_ATTR_RO(crash_elfcorehdr_size);
+
+#endif
+
+#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);
 
@@ -150,7 +194,7 @@ 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,
@@ -167,7 +211,7 @@ 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,
@@ -210,6 +254,8 @@ EXPORT_SYMBOL_GPL(kernel_kobj);
 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
@@ -218,11 +264,16 @@ static struct attribute * kernel_attrs[] = {
 #endif
 #ifdef CONFIG_KEXEC_CORE
        &kexec_loaded_attr.attr,
+#ifdef CONFIG_CRASH_DUMP
        &kexec_crash_loaded_attr.attr,
        &kexec_crash_size_attr.attr,
 #endif
-#ifdef CONFIG_CRASH_CORE
+#endif
+#ifdef CONFIG_VMCORE_INFO
        &vmcoreinfo_attr.attr,
+#ifdef CONFIG_CRASH_HOTPLUG
+       &crash_elfcorehdr_size_attr.attr,
+#endif
 #endif
 #ifndef CONFIG_TINY_RCU
        &rcu_expedited_attr.attr,