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Mon, 02 Feb 2026 03:16:01 -0800 (PST) From: Donglin Peng To: rostedt@goodmis.org, ast@kernel.org Cc: mhiramat@kernel.org, andrii.nakryiko@gmail.com, linux-kernel@vger.kernel.org, Donglin Peng , linux-trace-kernel@vger.kernel.org Subject: [PATCH 2/2] tracing: resolve enum names for function arguments via BTF Date: Mon, 2 Feb 2026 19:15:48 +0800 Message-Id: <20260202111548.3555306-3-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260202111548.3555306-1-dolinux.peng@gmail.com> References: <20260202111548.3555306-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Donglin Peng Use BTF to print symbolic names for enum-type function arguments, improving trace readability. Before: count_memcg_events(memcg=3D0xffff..., idx=3D20, count=3D0x1) { After: count_memcg_events(memcg=3D0xffff..., idx=3D20 [PGFAULT], count=3D0x1) { Cc: Steven Rostedt Cc: Masami Hiramatsu Cc: linux-trace-kernel@vger.kernel.org Signed-off-by: Donglin Peng --- kernel/trace/trace_output.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index cc2d3306bb60..c395f768c3b8 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -695,12 +695,13 @@ void print_function_args(struct trace_seq *s, unsigne= d long *args, { const struct btf_param *param; const struct btf_type *t; + const struct btf_enum *enump; const char *param_name; char name[KSYM_NAME_LEN]; unsigned long arg; struct btf *btf; s32 tid, nr =3D 0; - int a, p, x; + int a, p, x, i; u16 encode; =20 trace_seq_printf(s, "("); @@ -754,6 +755,14 @@ void print_function_args(struct trace_seq *s, unsigned= long *args, break; case BTF_KIND_ENUM: trace_seq_printf(s, "%ld", arg); + for_each_enum(i, t, enump) { + if (arg =3D=3D enump->val) { + trace_seq_printf(s, " [%s]", + btf_name_by_offset(btf, + enump->name_off)); + break; + } + } break; default: /* This does not handle complex arguments */ --=20 2.34.1