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Mon, 02 Feb 2026 03:15:58 -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 , Andrii Nakryiko , Eduard Zingerman , bpf@vger.kernel.org Subject: [PATCH 1/2] btf: Add for_each_enum and for_each_enum64 helper macros Date: Mon, 2 Feb 2026 19:15:47 +0800 Message-Id: <20260202111548.3555306-2-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 Introduce two new helper macros, for_each_enum and for_each_enum64, to clean up code. No functional changes. Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Eduard Zingerman Cc: bpf@vger.kernel.org Signed-off-by: Donglin Peng Reviewed-by: Masami Hiramatsu (Google) --- include/linux/btf.h | 10 +++++++ kernel/bpf/btf.c | 66 +++++++++++++++++++-------------------------- 2 files changed, 38 insertions(+), 38 deletions(-) diff --git a/include/linux/btf.h b/include/linux/btf.h index f06976ffb63f..cde2deb8e25e 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -254,6 +254,16 @@ const char *btf_type_str(const struct btf_type *t); i < btf_type_vlen(datasec_type); \ i++, member++) =20 +#define for_each_enum(i, enum_type, member) \ + for (i =3D 0, member =3D btf_enum(enum_type); \ + i < btf_type_vlen(enum_type); \ + i++, member++) + +#define for_each_enum64(i, enum_type, member) \ + for (i =3D 0, member =3D btf_enum64(enum_type); \ + i < btf_type_vlen(enum_type); \ + i++, member++) + static inline bool btf_type_is_ptr(const struct btf_type *t) { return BTF_INFO_KIND(t->info) =3D=3D BTF_KIND_PTR; diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 0de8fc8a0e0b..c80a7a0cbe1d 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -728,11 +728,6 @@ static const struct btf_array *btf_type_array(const st= ruct btf_type *t) return (const struct btf_array *)(t + 1); } =20 -static const struct btf_enum *btf_type_enum(const struct btf_type *t) -{ - return (const struct btf_enum *)(t + 1); -} - static const struct btf_var *btf_type_var(const struct btf_type *t) { return (const struct btf_var *)(t + 1); @@ -743,11 +738,6 @@ static const struct btf_decl_tag *btf_type_decl_tag(co= nst struct btf_type *t) return (const struct btf_decl_tag *)(t + 1); } =20 -static const struct btf_enum64 *btf_type_enum64(const struct btf_type *t) -{ - return (const struct btf_enum64 *)(t + 1); -} - static const struct btf_kind_operations *btf_type_ops(const struct btf_typ= e *t) { return kind_ops[BTF_INFO_KIND(t->info)]; @@ -4317,14 +4307,14 @@ static s32 btf_enum_check_meta(struct btf_verifier_= env *env, const struct btf_type *t, u32 meta_left) { - const struct btf_enum *enums =3D btf_type_enum(t); + const struct btf_enum *enump; struct btf *btf =3D env->btf; const char *fmt_str; u16 i, nr_enums; u32 meta_needed; =20 nr_enums =3D btf_type_vlen(t); - meta_needed =3D nr_enums * sizeof(*enums); + meta_needed =3D nr_enums * sizeof(*enump); =20 if (meta_left < meta_needed) { btf_verifier_log_basic(env, t, @@ -4347,16 +4337,16 @@ static s32 btf_enum_check_meta(struct btf_verifier_= env *env, =20 btf_verifier_log_type(env, t, NULL); =20 - for (i =3D 0; i < nr_enums; i++) { - if (!btf_name_offset_valid(btf, enums[i].name_off)) { + for_each_enum(i, t, enump) { + if (!btf_name_offset_valid(btf, enump->name_off)) { btf_verifier_log(env, "\tInvalid name_offset:%u", - enums[i].name_off); + enump->name_off); return -EINVAL; } =20 /* enum member must have a valid name */ - if (!enums[i].name_off || - !btf_name_valid_identifier(btf, enums[i].name_off)) { + if (!enump->name_off || + !btf_name_valid_identifier(btf, enump->name_off)) { btf_verifier_log_type(env, t, "Invalid name"); return -EINVAL; } @@ -4365,8 +4355,8 @@ static s32 btf_enum_check_meta(struct btf_verifier_en= v *env, continue; fmt_str =3D btf_type_kflag(t) ? "\t%s val=3D%d\n" : "\t%s val=3D%u\n"; btf_verifier_log(env, fmt_str, - __btf_name_by_offset(btf, enums[i].name_off), - enums[i].val); + __btf_name_by_offset(btf, enump->name_off), + enump->val); } =20 return meta_needed; @@ -4382,8 +4372,8 @@ static void btf_enum_show(const struct btf *btf, cons= t struct btf_type *t, u32 type_id, void *data, u8 bits_offset, struct btf_show *show) { - const struct btf_enum *enums =3D btf_type_enum(t); - u32 i, nr_enums =3D btf_type_vlen(t); + const struct btf_enum *enump; + u32 i; void *safe_data; int v; =20 @@ -4393,13 +4383,13 @@ static void btf_enum_show(const struct btf *btf, co= nst struct btf_type *t, =20 v =3D *(int *)safe_data; =20 - for (i =3D 0; i < nr_enums; i++) { - if (v !=3D enums[i].val) + for_each_enum(i, t, enump) { + if (v !=3D enump->val) continue; =20 btf_show_type_value(show, "%s", __btf_name_by_offset(btf, - enums[i].name_off)); + enump->name_off)); =20 btf_show_end_type(show); return; @@ -4425,14 +4415,14 @@ static s32 btf_enum64_check_meta(struct btf_verifie= r_env *env, const struct btf_type *t, u32 meta_left) { - const struct btf_enum64 *enums =3D btf_type_enum64(t); + const struct btf_enum64 *enump; struct btf *btf =3D env->btf; const char *fmt_str; u16 i, nr_enums; u32 meta_needed; =20 nr_enums =3D btf_type_vlen(t); - meta_needed =3D nr_enums * sizeof(*enums); + meta_needed =3D nr_enums * sizeof(*enump); =20 if (meta_left < meta_needed) { btf_verifier_log_basic(env, t, @@ -4455,16 +4445,16 @@ static s32 btf_enum64_check_meta(struct btf_verifie= r_env *env, =20 btf_verifier_log_type(env, t, NULL); =20 - for (i =3D 0; i < nr_enums; i++) { - if (!btf_name_offset_valid(btf, enums[i].name_off)) { + for_each_enum64(i, t, enump) { + if (!btf_name_offset_valid(btf, enump->name_off)) { btf_verifier_log(env, "\tInvalid name_offset:%u", - enums[i].name_off); + enump->name_off); return -EINVAL; } =20 /* enum member must have a valid name */ - if (!enums[i].name_off || - !btf_name_valid_identifier(btf, enums[i].name_off)) { + if (!enump->name_off || + !btf_name_valid_identifier(btf, enump->name_off)) { btf_verifier_log_type(env, t, "Invalid name"); return -EINVAL; } @@ -4474,8 +4464,8 @@ static s32 btf_enum64_check_meta(struct btf_verifier_= env *env, =20 fmt_str =3D btf_type_kflag(t) ? "\t%s val=3D%lld\n" : "\t%s val=3D%llu\n= "; btf_verifier_log(env, fmt_str, - __btf_name_by_offset(btf, enums[i].name_off), - btf_enum64_value(enums + i)); + __btf_name_by_offset(btf, enump->name_off), + btf_enum64_value(enump)); } =20 return meta_needed; @@ -4485,8 +4475,8 @@ static void btf_enum64_show(const struct btf *btf, co= nst struct btf_type *t, u32 type_id, void *data, u8 bits_offset, struct btf_show *show) { - const struct btf_enum64 *enums =3D btf_type_enum64(t); - u32 i, nr_enums =3D btf_type_vlen(t); + const struct btf_enum64 *enump; + u32 i; void *safe_data; s64 v; =20 @@ -4496,13 +4486,13 @@ static void btf_enum64_show(const struct btf *btf, = const struct btf_type *t, =20 v =3D *(u64 *)safe_data; =20 - for (i =3D 0; i < nr_enums; i++) { - if (v !=3D btf_enum64_value(enums + i)) + for_each_enum64(i, t, enump) { + if (v !=3D btf_enum64_value(enump)) continue; =20 btf_show_type_value(show, "%s", __btf_name_by_offset(btf, - enums[i].name_off)); + enump->name_off)); =20 btf_show_end_type(show); 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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