// SPDX-License-Identifier: GPL-2.0/* * Provide kernel BTF information for introspection and use by eBPF tools. */#include <linux/kernel.h>#include <linux/module.h>#include <linux/kobject.h>#include <linux/init.h>#include <linux/sysfs.h> /* See scripts/link-vmlinux.sh, gen_btf() func for details */extern char __weak __start_BTF[];extern char __weak __stop_BTF[]; static ssize_tbtf_vmlinux_read(struct file *file, struct kobject *kobj,		 struct bin_attribute *bin_attr,		 char *buf, loff_t off, size_t len){	memcpy(buf, __start_BTF + off, len);	return len;} static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = {	.attr = { .name = "vmlinux", .mode = 0444, },	.read = btf_vmlinux_read,}; struct kobject *btf_kobj; static int __init btf_vmlinux_init(void){	bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF; 	if (!__start_BTF || bin_attr_btf_vmlinux.size == 0)		return 0; 	btf_kobj = kobject_create_and_add("btf", kernel_kobj);	if (!btf_kobj)		return -ENOMEM; 	return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);} subsys_initcall(btf_vmlinux_init);