Merge branch 'bpf-libbpf-read-sysfs-btf'

Andrii Nakryiko says:

====================
Now that kernel's BTF is exposed through sysfs at well-known location, attempt
to load it first as a target BTF for the purpose of BPF CO-RE relocations.

Patch #1 is a follow-up patch to rename /sys/kernel/btf/kernel into
/sys/kernel/btf/vmlinux.

Patch #2 adds ability to load raw BTF contents from sysfs and expands the list
of locations libbpf attempts to load vmlinux BTF from.
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 15 insertions, 15 deletions

diff --git a/kernel/bpf/sysfs_btf.c b/kernel/bpf/sysfs_btf.c
index 092e63b9758b..4659349fc795 100644
--- a/kernel/bpf/sysfs_btf.c
+++ b/kernel/bpf/sysfs_btf.c
@@ -9,30 +9,30 @@
 #include <linux/sysfs.h>
 
 /* See scripts/link-vmlinux.sh, gen_btf() func for details */
-extern char __weak _binary__btf_kernel_bin_start[];
-extern char __weak _binary__btf_kernel_bin_end[];
+extern char __weak _binary__btf_vmlinux_bin_start[];
+extern char __weak _binary__btf_vmlinux_bin_end[];
 
 static ssize_t
-btf_kernel_read(struct file *file, struct kobject *kobj,
-		struct bin_attribute *bin_attr,
-		char *buf, loff_t off, size_t len)
+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_kernel_bin_start + off, len);
+	memcpy(buf, _binary__btf_vmlinux_bin_start + off, len);
 	return len;
 }
 
-static struct bin_attribute bin_attr_btf_kernel __ro_after_init = {
-	.attr = { .name = "kernel", .mode = 0444, },
-	.read = btf_kernel_read,
+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_kernel_init(void)
+static int __init btf_vmlinux_init(void)
 {
 	int err;
 
-	if (!_binary__btf_kernel_bin_start)
+	if (!_binary__btf_vmlinux_bin_start)
 		return 0;
 
 	btf_kobj = kobject_create_and_add("btf", kernel_kobj);
@@ -42,10 +42,10 @@ static int __init btf_kernel_init(void)
 		return err;
 	}
 
-	bin_attr_btf_kernel.size = _binary__btf_kernel_bin_end -
-				   _binary__btf_kernel_bin_start;
+	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_kernel);
+	return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
 }
 
-subsys_initcall(btf_kernel_init);
+subsys_initcall(btf_vmlinux_init);