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| author | Rong Tao <rongtao@cestc.cn> | 2022-10-29 17:11:13 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-11-04 14:57:31 -0700 |
| commit | 1baa7e38002111aee62b489ac343960ae75ce2e9 (patch) | |
| tree | 6ebd45a200e2901fd7aab1d4dc5ed6340c46ce65 /samples | |
| parent | 2e20f50ff84903964bcfca10ecdab0fa08cd6a4c (diff) | |
| download | linux-1baa7e38002111aee62b489ac343960ae75ce2e9.tar.bz2 | |
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 <rongtao@cestc.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/tencent_0F0DAE84C0B3C42E0B550E5E9F47A9114D09@qq.com
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/tracex2_kern.c | 4 | ||||
| -rw-r--r-- | samples/bpf/tracex2_user.c | 3 |
2 files changed, 4 insertions, 3 deletions
diff --git a/samples/bpf/tracex2_kern.c b/samples/bpf/tracex2_kern.c index 5bc696bac27d..93e0b7680b4f 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 dd6205c6b6a7..089e408abd7a 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; |