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From: Song Liu <songliubraving@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>
Cc: <ast@kernel.org>, <daniel@iogearbox.net>, <kernel-team@fb.com>,
	<john.fastabend@gmail.com>, <kpsingh@chromium.org>,
	Song Liu <songliubraving@fb.com>
Subject: [PATCH bpf-next 2/3] bpf: allow %pB in bpf_seq_printf()
Date: Tue, 23 Jun 2020 00:08:01 -0700	[thread overview]
Message-ID: <20200623070802.2310018-3-songliubraving@fb.com> (raw)
In-Reply-To: <20200623070802.2310018-1-songliubraving@fb.com>

This makes it easy to dump stack trace with bpf_seq_printf().

Signed-off-by: Song Liu <songliubraving@fb.com>
---
 kernel/trace/bpf_trace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 2c13bcb5c2bce..ced3176801ae8 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -636,7 +636,8 @@ BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size,
 		if (fmt[i] == 'p') {
 			if (fmt[i + 1] == 0 ||
 			    fmt[i + 1] == 'K' ||
-			    fmt[i + 1] == 'x') {
+			    fmt[i + 1] == 'x' ||
+			    fmt[i + 1] == 'B') {
 				/* just kernel pointers */
 				params[fmt_cnt] = args[fmt_cnt];
 				fmt_cnt++;
-- 
2.24.1


  parent reply	other threads:[~2020-06-23  7:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23  7:07 [PATCH bpf-next 0/3] bpf: introduce bpf_get_task_stack_trace() Song Liu
2020-06-23  7:08 ` [PATCH bpf-next 1/3] bpf: introduce helper bpf_get_task_stack_trace() Song Liu
2020-06-23 15:19   ` Alexei Starovoitov
2020-06-23 16:59     ` Song Liu
2020-06-23 17:40       ` Song Liu
2020-06-23 18:41       ` Andrii Nakryiko
2020-06-23 15:22   ` Daniel Borkmann
2020-06-23 17:19     ` Song Liu
2020-06-23 18:45   ` Andrii Nakryiko
2020-06-23 22:53     ` Song Liu
2020-06-23  7:08 ` Song Liu [this message]
2020-06-23 15:29   ` [PATCH bpf-next 2/3] bpf: allow %pB in bpf_seq_printf() Daniel Borkmann
2020-06-23 17:19     ` Song Liu
2020-06-23  7:08 ` [PATCH bpf-next 3/3] selftests/bpf: add bpf_iter test with bpf_get_task_stack_trace() Song Liu
2020-06-23 18:57   ` Yonghong Song
2020-06-23 22:07     ` Song Liu
2020-06-23 22:27       ` Yonghong Song
2020-06-24 20:37         ` Song Liu
2020-06-25  5:29           ` Yonghong Song

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