linux-kernel - [PATCH bpf-next] samples/bpf: tracex4: Fix failed to create kretprobe 'kmem_cache_alloc

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Message-ID: <tencent_34E5BCCAC5ABF3E81222AD81B1D05F16DE06@qq.com>
Date: Tue, 27 Aug 2024 12:30:30 +0800
From: Rong Tao <rtoax@...mail.com>
To: ast@...nel.org,
	daniel@...earbox.net
Cc: Rong Tao <rongtao@...tc.cn>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	bpf@...r.kernel.org (open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH bpf-next] samples/bpf: tracex4: Fix failed to create kretprobe 'kmem_cache_alloc_node+0x0'

From: Rong Tao <rongtao@...tc.cn>

commit 7bd230a26648 ("mm/slab: enable slab allocation tagging for kmalloc
and friends") [1] swap kmem_cache_alloc_node() to
kmem_cache_alloc_node_noprof().

    linux/samples/bpf$ sudo ./tracex4
    libbpf: prog 'bpf_prog2': failed to create kretprobe
    'kmem_cache_alloc_node+0x0' perf event: No such file or directory
    ERROR: bpf_program__attach failed

Link: https://github.com/torvalds/linux/commit/7bd230a26648ac68ab3731ebbc449090f0ac6a37
Signed-off-by: Rong Tao <rongtao@...tc.cn>
---
 samples/bpf/tracex4.bpf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/bpf/tracex4.bpf.c b/samples/bpf/tracex4.bpf.c
index ca826750901a..d786492fd926 100644
--- a/samples/bpf/tracex4.bpf.c
+++ b/samples/bpf/tracex4.bpf.c
@@ -33,13 +33,13 @@ int bpf_prog1(struct pt_regs *ctx)
 	return 0;
 }
 
-SEC("kretprobe/kmem_cache_alloc_node")
+SEC("kretprobe/kmem_cache_alloc_node_noprof")
 int bpf_prog2(struct pt_regs *ctx)
 {
 	long ptr = PT_REGS_RC(ctx);
 	long ip = 0;
 
-	/* get ip address of kmem_cache_alloc_node() caller */
+	/* get ip address of kmem_cache_alloc_node_noprof() caller */
 	BPF_KRETPROBE_READ_RET_IP(ip, ctx);
 
 	struct pair v = {
-- 
2.46.0