btf: Switch vmlinux BTF attribute to sysfs_bin_attr_simple_read()

The generic function from the sysfs core can replace the custom one.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20241228-sysfs-const-bin_attr-simple-v2-2-7c6f3f1767a3@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/bpf/sysfs_btf.c b/kernel/bpf/sysfs_btf.c
index fedb54c94cdb830a4890d33677dcc5a6e236c13f..81d6cf90584a7157929c50f62a5c6862e7a3d081 100644 (file)
--- a/kernel/bpf/sysfs_btf.c
+++ b/kernel/bpf/sysfs_btf.c
@@ -12,24 +12,16 @@
 extern char __start_BTF[];
 extern char __stop_BTF[];
 
-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, __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,
+       .read_new = sysfs_bin_attr_simple_read,
 };
 
 struct kobject *btf_kobj;
 
 static int __init btf_vmlinux_init(void)
 {
+       bin_attr_btf_vmlinux.private = __start_BTF;
        bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF;
 
        if (bin_attr_btf_vmlinux.size == 0)