mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 18:10:50 +07:00
e03250061b
In case of error, the function kobject_create_and_add() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.
Fixes: 341dfcf8d7 ("btf: expose BTF info through sysfs")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
// 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 _binary__btf_vmlinux_bin_start[];
|
|
extern char __weak _binary__btf_vmlinux_bin_end[];
|
|
|
|
static ssize_t
|
|
btf_vmlinux_read(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t len)
|
|
{
|
|
memcpy(buf, _binary__btf_vmlinux_bin_start + off, len);
|
|
return len;
|
|
}
|
|
|
|
static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = {
|
|
.attr = { .name = "vmlinux", .mode = 0444, },
|
|
.read = btf_vmlinux_read,
|
|
};
|
|
|
|
static struct kobject *btf_kobj;
|
|
|
|
static int __init btf_vmlinux_init(void)
|
|
{
|
|
if (!_binary__btf_vmlinux_bin_start)
|
|
return 0;
|
|
|
|
btf_kobj = kobject_create_and_add("btf", kernel_kobj);
|
|
if (!btf_kobj)
|
|
return -ENOMEM;
|
|
|
|
bin_attr_btf_vmlinux.size = _binary__btf_vmlinux_bin_end -
|
|
_binary__btf_vmlinux_bin_start;
|
|
|
|
return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
|
|
}
|
|
|
|
subsys_initcall(btf_vmlinux_init);
|