Merge tag 'perf-tools-for-v6.2-1-2022-12-16' of git://git.kernel.org/pub/scm/linux...

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

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 65dba90..2df00b7 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)
 
@@ -34,6 +43,14 @@ static ssize_t uevent_seqnum_show(struct kobject *kobj,
 }
 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);
+
 #ifdef CONFIG_UEVENT_HELPER
 /* uevent helper program, used during early boot */
 static ssize_t uevent_helper_show(struct kobject *kobj,
@@ -215,6 +232,7 @@ EXPORT_SYMBOL_GPL(kernel_kobj);
 static struct attribute * kernel_attrs[] = {
        &fscaps_attr.attr,
        &uevent_seqnum_attr.attr,
+       &cpu_byteorder_attr.attr,
 #ifdef CONFIG_UEVENT_HELPER
        &uevent_helper_attr.attr,
 #endif