From: Rong Tao Date: Sat, 29 Oct 2022 09:11:13 +0000 (+0800) Subject: samples/bpf: Fix tracex2 error: No such file or directory X-Git-Tag: v6.2-rc1~99^2~230^2~17 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1baa7e38002111aee62b489ac343960ae75ce2e9;p=thirdparty%2Flinux.git samples/bpf: Fix tracex2 error: No such file or directory since commit c504e5c2f964("net: skb: introduce kfree_skb_reason()") kfree_skb() is replaced by kfree_skb_reason() and kfree_skb() is set to the inline function. So, we replace kprobe/kfree_skb with kprobe/kfree_skb_reason to solve the tracex2 error. $ cd samples/bpf $ sudo ./tracex2 libbpf: prog 'bpf_prog2': failed to create kprobe 'kfree_skb+0x0' perf event: No such file or directory ERROR: bpf_program__attach failed Signed-off-by: Rong Tao Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/tencent_0F0DAE84C0B3C42E0B550E5E9F47A9114D09@qq.com --- diff --git a/samples/bpf/tracex2_kern.c b/samples/bpf/tracex2_kern.c index 5bc696bac27d7..93e0b7680b4f0 100644 --- a/samples/bpf/tracex2_kern.c +++ b/samples/bpf/tracex2_kern.c @@ -22,14 +22,14 @@ struct { /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe * example will no longer be meaningful */ -SEC("kprobe/kfree_skb") +SEC("kprobe/kfree_skb_reason") int bpf_prog2(struct pt_regs *ctx) { long loc = 0; long init_val = 1; long *value; - /* read ip of kfree_skb caller. + /* read ip of kfree_skb_reason caller. * non-portable version of __builtin_return_address(0) */ BPF_KPROBE_READ_RET_IP(loc, ctx); diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c index dd6205c6b6a74..089e408abd7ad 100644 --- a/samples/bpf/tracex2_user.c +++ b/samples/bpf/tracex2_user.c @@ -146,7 +146,8 @@ int main(int ac, char **argv) signal(SIGINT, int_exit); signal(SIGTERM, int_exit); - /* start 'ping' in the background to have some kfree_skb events */ + /* start 'ping' in the background to have some kfree_skb_reason + * events */ f = popen("ping -4 -c5 localhost", "r"); (void) f;