[PATCH v3 bpf-next 0/2] bpf: Allow some trace helpers for all prog types

[PATCH v3 bpf-next 0/2] bpf: Allow some trace helpers for all prog types

[Feng Yang]

From: Feng Yang <yangfeng@kylinos.cn>

This series allow some trace helpers for all prog types.

if it works under NMI and doesn't use any context-dependent things,
should be fine for any program type. The detailed discussion is in [1].

[1] https://lore.kernel.org/all/CAEf4Bza6gK3dsrTosk6k3oZgtHesNDSrDd8sdeQ-GiS6oJixQg@mail.gmail.com/

---
Changes in v3:
- cgroup_current_func_proto clean.
- bpf_scx_get_func_proto clean. Thanks, Andrii Nakryiko.
- Link to v2: https://lore.kernel.org/all/20250427063821.207263-1-yangfeng59949@163.com/

Changes in v2:
- not expose compat probe read APIs to more program types.
- Remove the prog->sleepable check added for copy_from_user,
- or the summarization_freplace/might_sleep_with_might_sleep test will fail with the error "program of this type cannot use helper bpf_copy_from_user"
- Link to v1: https://lore.kernel.org/all/20250425080032.327477-1-yangfeng59949@163.com/

Feng Yang (2):
  bpf: Allow some trace helpers for all prog types
  sched_ext: Remove bpf_scx_get_func_proto

 include/linux/bpf-cgroup.h |  8 --------
 kernel/bpf/cgroup.c        | 32 -----------------------------
 kernel/bpf/helpers.c       | 42 ++++++++++++++++++++++++++++++++++++++
 kernel/sched/ext.c         | 15 +-------------
 kernel/trace/bpf_trace.c   | 41 ++++---------------------------------
 net/core/filter.c          | 14 -------------
 6 files changed, 47 insertions(+), 105 deletions(-)

-- 
2.43.0

[PATCH v3 bpf-next 1/2] bpf: Allow some trace helpers for all prog types

[Feng Yang]

From: Feng Yang <yangfeng@kylinos.cn>

if it works under NMI and doesn't use any context-dependent things,
should be fine for any program type. The detailed discussion is in [1].

[1] https://lore.kernel.org/all/CAEf4Bza6gK3dsrTosk6k3oZgtHesNDSrDd8sdeQ-GiS6oJixQg@mail.gmail.com/

Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
---
 include/linux/bpf-cgroup.h |  8 --------
 kernel/bpf/cgroup.c        | 32 -----------------------------
 kernel/bpf/helpers.c       | 42 ++++++++++++++++++++++++++++++++++++++
 kernel/trace/bpf_trace.c   | 41 ++++---------------------------------
 net/core/filter.c          | 14 -------------
 5 files changed, 46 insertions(+), 91 deletions(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index 9de7adb68294..4847dcade917 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -427,8 +427,6 @@ int cgroup_bpf_prog_query(const union bpf_attr *attr,
 
 const struct bpf_func_proto *
 cgroup_common_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
-const struct bpf_func_proto *
-cgroup_current_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
 #else
 
 static inline int cgroup_bpf_inherit(struct cgroup *cgrp) { return 0; }
@@ -465,12 +463,6 @@ cgroup_common_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	return NULL;
 }
 
-static inline const struct bpf_func_proto *
-cgroup_current_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
-{
-	return NULL;
-}
-
 static inline int bpf_cgroup_storage_assign(struct bpf_prog_aux *aux,
 					    struct bpf_map *map) { return 0; }
 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 84f58f3d028a..62a1d8deb3dc 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1653,10 +1653,6 @@ cgroup_dev_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	if (func_proto)
 		return func_proto;
 
-	func_proto = cgroup_current_func_proto(func_id, prog);
-	if (func_proto)
-		return func_proto;
-
 	switch (func_id) {
 	case BPF_FUNC_perf_event_output:
 		return &bpf_event_output_data_proto;
@@ -2204,10 +2200,6 @@ sysctl_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	if (func_proto)
 		return func_proto;
 
-	func_proto = cgroup_current_func_proto(func_id, prog);
-	if (func_proto)
-		return func_proto;
-
 	switch (func_id) {
 	case BPF_FUNC_sysctl_get_name:
 		return &bpf_sysctl_get_name_proto;
@@ -2351,10 +2343,6 @@ cg_sockopt_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	if (func_proto)
 		return func_proto;
 
-	func_proto = cgroup_current_func_proto(func_id, prog);
-	if (func_proto)
-		return func_proto;
-
 	switch (func_id) {
 #ifdef CONFIG_NET
 	case BPF_FUNC_get_netns_cookie:
@@ -2601,23 +2589,3 @@ cgroup_common_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return NULL;
 	}
 }
-
-/* Common helpers for cgroup hooks with valid process context. */
-const struct bpf_func_proto *
-cgroup_current_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
-{
-	switch (func_id) {
-	case BPF_FUNC_get_current_uid_gid:
-		return &bpf_get_current_uid_gid_proto;
-	case BPF_FUNC_get_current_comm:
-		return &bpf_get_current_comm_proto;
-#ifdef CONFIG_CGROUP_NET_CLASSID
-	case BPF_FUNC_get_cgroup_classid:
-		return &bpf_get_cgroup_classid_curr_proto;
-#endif
-	case BPF_FUNC_current_task_under_cgroup:
-		return &bpf_current_task_under_cgroup_proto;
-	default:
-		return NULL;
-	}
-}
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index e3a2662f4e33..c42b6c331461 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -23,6 +23,7 @@
 #include <linux/btf_ids.h>
 #include <linux/bpf_mem_alloc.h>
 #include <linux/kasan.h>
+#include <linux/bpf_verifier.h>
 
 #include "../../lib/kstrtox.h"
 
@@ -1912,6 +1913,12 @@ const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
 const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
 const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak;
 const struct bpf_func_proto bpf_task_pt_regs_proto __weak;
+const struct bpf_func_proto bpf_perf_event_read_proto __weak;
+const struct bpf_func_proto bpf_send_signal_proto __weak;
+const struct bpf_func_proto bpf_send_signal_thread_proto __weak;
+const struct bpf_func_proto bpf_get_task_stack_sleepable_proto __weak;
+const struct bpf_func_proto bpf_get_task_stack_proto __weak;
+const struct bpf_func_proto bpf_get_branch_snapshot_proto __weak;
 
 const struct bpf_func_proto *
 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
@@ -1965,6 +1972,8 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_pid_tgid_proto;
 	case BPF_FUNC_get_ns_current_pid_tgid:
 		return &bpf_get_ns_current_pid_tgid_proto;
+	case BPF_FUNC_get_current_uid_gid:
+		return &bpf_get_current_uid_gid_proto;
 	default:
 		break;
 	}
@@ -2022,7 +2031,21 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_cgroup_id_proto;
 	case BPF_FUNC_get_current_ancestor_cgroup_id:
 		return &bpf_get_current_ancestor_cgroup_id_proto;
+	case BPF_FUNC_current_task_under_cgroup:
+		return &bpf_current_task_under_cgroup_proto;
 #endif
+#ifdef CONFIG_CGROUP_NET_CLASSID
+	case BPF_FUNC_get_cgroup_classid:
+		return &bpf_get_cgroup_classid_curr_proto;
+#endif
+	case BPF_FUNC_task_storage_get:
+		if (bpf_prog_check_recur(prog))
+			return &bpf_task_storage_get_recur_proto;
+		return &bpf_task_storage_get_proto;
+	case BPF_FUNC_task_storage_delete:
+		if (bpf_prog_check_recur(prog))
+			return &bpf_task_storage_delete_recur_proto;
+		return &bpf_task_storage_delete_proto;
 	default:
 		break;
 	}
@@ -2037,6 +2060,8 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_task_proto;
 	case BPF_FUNC_get_current_task_btf:
 		return &bpf_get_current_task_btf_proto;
+	case BPF_FUNC_get_current_comm:
+		return &bpf_get_current_comm_proto;
 	case BPF_FUNC_probe_read_user:
 		return &bpf_probe_read_user_proto;
 	case BPF_FUNC_probe_read_kernel:
@@ -2047,6 +2072,10 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	case BPF_FUNC_probe_read_kernel_str:
 		return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
 		       NULL : &bpf_probe_read_kernel_str_proto;
+	case BPF_FUNC_copy_from_user:
+		return &bpf_copy_from_user_proto;
+	case BPF_FUNC_copy_from_user_task:
+		return &bpf_copy_from_user_task_proto;
 	case BPF_FUNC_snprintf_btf:
 		return &bpf_snprintf_btf_proto;
 	case BPF_FUNC_snprintf:
@@ -2057,6 +2086,19 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return bpf_get_trace_vprintk_proto();
 	case BPF_FUNC_perf_event_read_value:
 		return bpf_get_perf_event_read_value_proto();
+	case BPF_FUNC_perf_event_read:
+		return &bpf_perf_event_read_proto;
+	case BPF_FUNC_send_signal:
+		return &bpf_send_signal_proto;
+	case BPF_FUNC_send_signal_thread:
+		return &bpf_send_signal_thread_proto;
+	case BPF_FUNC_get_task_stack:
+		return prog->sleepable ? &bpf_get_task_stack_sleepable_proto
+				       : &bpf_get_task_stack_proto;
+	case BPF_FUNC_get_branch_snapshot:
+		return &bpf_get_branch_snapshot_proto;
+	case BPF_FUNC_find_vma:
+		return &bpf_find_vma_proto;
 	default:
 		return NULL;
 	}
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 52c432a44aeb..868920994517 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -572,7 +572,7 @@ BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags)
 	return value;
 }
 
-static const struct bpf_func_proto bpf_perf_event_read_proto = {
+const struct bpf_func_proto bpf_perf_event_read_proto = {
 	.func		= bpf_perf_event_read,
 	.gpl_only	= true,
 	.ret_type	= RET_INTEGER,
@@ -882,7 +882,7 @@ BPF_CALL_1(bpf_send_signal, u32, sig)
 	return bpf_send_signal_common(sig, PIDTYPE_TGID, NULL, 0);
 }
 
-static const struct bpf_func_proto bpf_send_signal_proto = {
+const struct bpf_func_proto bpf_send_signal_proto = {
 	.func		= bpf_send_signal,
 	.gpl_only	= false,
 	.ret_type	= RET_INTEGER,
@@ -894,7 +894,7 @@ BPF_CALL_1(bpf_send_signal_thread, u32, sig)
 	return bpf_send_signal_common(sig, PIDTYPE_PID, NULL, 0);
 }
 
-static const struct bpf_func_proto bpf_send_signal_thread_proto = {
+const struct bpf_func_proto bpf_send_signal_thread_proto = {
 	.func		= bpf_send_signal_thread,
 	.gpl_only	= false,
 	.ret_type	= RET_INTEGER,
@@ -1185,7 +1185,7 @@ BPF_CALL_3(bpf_get_branch_snapshot, void *, buf, u32, size, u64, flags)
 	return entry_cnt * br_entry_size;
 }
 
-static const struct bpf_func_proto bpf_get_branch_snapshot_proto = {
+const struct bpf_func_proto bpf_get_branch_snapshot_proto = {
 	.func		= bpf_get_branch_snapshot,
 	.gpl_only	= true,
 	.ret_type	= RET_INTEGER,
@@ -1430,14 +1430,8 @@ bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	const struct bpf_func_proto *func_proto;
 
 	switch (func_id) {
-	case BPF_FUNC_get_current_uid_gid:
-		return &bpf_get_current_uid_gid_proto;
-	case BPF_FUNC_get_current_comm:
-		return &bpf_get_current_comm_proto;
 	case BPF_FUNC_get_smp_processor_id:
 		return &bpf_get_smp_processor_id_proto;
-	case BPF_FUNC_perf_event_read:
-		return &bpf_perf_event_read_proto;
 #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
 	case BPF_FUNC_probe_read:
 		return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
@@ -1446,35 +1440,8 @@ bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
 		       NULL : &bpf_probe_read_compat_str_proto;
 #endif
-#ifdef CONFIG_CGROUPS
-	case BPF_FUNC_current_task_under_cgroup:
-		return &bpf_current_task_under_cgroup_proto;
-#endif
-	case BPF_FUNC_send_signal:
-		return &bpf_send_signal_proto;
-	case BPF_FUNC_send_signal_thread:
-		return &bpf_send_signal_thread_proto;
-	case BPF_FUNC_get_task_stack:
-		return prog->sleepable ? &bpf_get_task_stack_sleepable_proto
-				       : &bpf_get_task_stack_proto;
-	case BPF_FUNC_copy_from_user:
-		return &bpf_copy_from_user_proto;
-	case BPF_FUNC_copy_from_user_task:
-		return &bpf_copy_from_user_task_proto;
-	case BPF_FUNC_task_storage_get:
-		if (bpf_prog_check_recur(prog))
-			return &bpf_task_storage_get_recur_proto;
-		return &bpf_task_storage_get_proto;
-	case BPF_FUNC_task_storage_delete:
-		if (bpf_prog_check_recur(prog))
-			return &bpf_task_storage_delete_recur_proto;
-		return &bpf_task_storage_delete_proto;
 	case BPF_FUNC_get_func_ip:
 		return &bpf_get_func_ip_proto_tracing;
-	case BPF_FUNC_get_branch_snapshot:
-		return &bpf_get_branch_snapshot_proto;
-	case BPF_FUNC_find_vma:
-		return &bpf_find_vma_proto;
 	default:
 		break;
 	}
diff --git a/net/core/filter.c b/net/core/filter.c
index 79cab4d78dc3..30e7d3679088 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -8022,10 +8022,6 @@ sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	if (func_proto)
 		return func_proto;
 
-	func_proto = cgroup_current_func_proto(func_id, prog);
-	if (func_proto)
-		return func_proto;
-
 	switch (func_id) {
 	case BPF_FUNC_get_socket_cookie:
 		return &bpf_get_socket_cookie_sock_proto;
@@ -8051,10 +8047,6 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	if (func_proto)
 		return func_proto;
 
-	func_proto = cgroup_current_func_proto(func_id, prog);
-	if (func_proto)
-		return func_proto;
-
 	switch (func_id) {
 	case BPF_FUNC_bind:
 		switch (prog->expected_attach_type) {
@@ -8488,18 +8480,12 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_msg_pop_data_proto;
 	case BPF_FUNC_perf_event_output:
 		return &bpf_event_output_data_proto;
-	case BPF_FUNC_get_current_uid_gid:
-		return &bpf_get_current_uid_gid_proto;
 	case BPF_FUNC_sk_storage_get:
 		return &bpf_sk_storage_get_proto;
 	case BPF_FUNC_sk_storage_delete:
 		return &bpf_sk_storage_delete_proto;
 	case BPF_FUNC_get_netns_cookie:
 		return &bpf_get_netns_cookie_sk_msg_proto;
-#ifdef CONFIG_CGROUP_NET_CLASSID
-	case BPF_FUNC_get_cgroup_classid:
-		return &bpf_get_cgroup_classid_curr_proto;
-#endif
 	default:
 		return bpf_sk_base_func_proto(func_id, prog);
 	}
-- 
2.43.0

[PATCH v3 sched_ext 2/2] sched_ext: Remove bpf_scx_get_func_proto

[Feng Yang]

From: Feng Yang <yangfeng@kylinos.cn>

task_storage_{get,delete} has been moved to bpf_base_func_proto.

Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
---
 kernel/sched/ext.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index fdbf249d1c68..cc628b009e11 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5586,21 +5586,8 @@ static int bpf_scx_btf_struct_access(struct bpf_verifier_log *log,
 	return -EACCES;
 }
 
-static const struct bpf_func_proto *
-bpf_scx_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
-{
-	switch (func_id) {
-	case BPF_FUNC_task_storage_get:
-		return &bpf_task_storage_get_proto;
-	case BPF_FUNC_task_storage_delete:
-		return &bpf_task_storage_delete_proto;
-	default:
-		return bpf_base_func_proto(func_id, prog);
-	}
-}
-
 static const struct bpf_verifier_ops bpf_scx_verifier_ops = {
-	.get_func_proto = bpf_scx_get_func_proto,
+	.get_func_proto = bpf_base_func_proto,
 	.is_valid_access = bpf_scx_is_valid_access,
 	.btf_struct_access = bpf_scx_btf_struct_access,
 };
-- 
2.43.0

Re: [PATCH v3 sched_ext 2/2] sched_ext: Remove bpf_scx_get_func_proto

[Andrii Nakryiko]

On Mon, May 5, 2025 at 11:15 PM Feng Yang <yangfeng59949@163.com> wrote:
>
> From: Feng Yang <yangfeng@kylinos.cn>
>
> task_storage_{get,delete} has been moved to bpf_base_func_proto.
>
> Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
> Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
> ---
>  kernel/sched/ext.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
>

Given this has dependency on patch #1, we should either route this
patch through bpf-next, or we'll have to delay and resend it after
merge window.

Tejun, any preferences?

> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index fdbf249d1c68..cc628b009e11 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -5586,21 +5586,8 @@ static int bpf_scx_btf_struct_access(struct bpf_verifier_log *log,
>         return -EACCES;
>  }
>
> -static const struct bpf_func_proto *
> -bpf_scx_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> -{
> -       switch (func_id) {
> -       case BPF_FUNC_task_storage_get:
> -               return &bpf_task_storage_get_proto;
> -       case BPF_FUNC_task_storage_delete:
> -               return &bpf_task_storage_delete_proto;
> -       default:
> -               return bpf_base_func_proto(func_id, prog);
> -       }
> -}
> -
>  static const struct bpf_verifier_ops bpf_scx_verifier_ops = {
> -       .get_func_proto = bpf_scx_get_func_proto,
> +       .get_func_proto = bpf_base_func_proto,
>         .is_valid_access = bpf_scx_is_valid_access,
>         .btf_struct_access = bpf_scx_btf_struct_access,
>  };
> --
> 2.43.0
>

Re: [PATCH v3 sched_ext 2/2] sched_ext: Remove bpf_scx_get_func_proto

[Tejun Heo]

On Tue, May 06, 2025 at 03:30:39PM -0700, Andrii Nakryiko wrote:
> On Mon, May 5, 2025 at 11:15 PM Feng Yang <yangfeng59949@163.com> wrote:
> >
> > From: Feng Yang <yangfeng@kylinos.cn>
> >
> > task_storage_{get,delete} has been moved to bpf_base_func_proto.
> >
> > Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
> > Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
> > ---
> >  kernel/sched/ext.c | 15 +--------------
> >  1 file changed, 1 insertion(+), 14 deletions(-)
> >
> 
> Given this has dependency on patch #1, we should either route this
> patch through bpf-next, or we'll have to delay and resend it after
> merge window.
> 
> Tejun, any preferences?

Yeah, bpf-next sounds good to me and please feel free to add:

 Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun

Re: [PATCH v3 bpf-next 1/2] bpf: Allow some trace helpers for all prog types

[Tejun Heo]

On Tue, May 06, 2025 at 02:14:33PM +0800, Feng Yang wrote:
> From: Feng Yang <yangfeng@kylinos.cn>
> 
> if it works under NMI and doesn't use any context-dependent things,
> should be fine for any program type. The detailed discussion is in [1].
> 
> [1] https://lore.kernel.org/all/CAEf4Bza6gK3dsrTosk6k3oZgtHesNDSrDd8sdeQ-GiS6oJixQg@mail.gmail.com/
> 
> Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
> Signed-off-by: Feng Yang <yangfeng@kylinos.cn>

Acked-by: Tejun Heo <tj@kernel.org>

Ditto, please route through bpf/for-next.

Thanks.

-- 
tejun

Re: [PATCH v3 bpf-next 0/2] bpf: Allow some trace helpers for all prog types

[patchwork-bot+netdevbpf]

Hello:

This series was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue,  6 May 2025 14:14:32 +0800 you wrote:
> From: Feng Yang <yangfeng@kylinos.cn>
> 
> This series allow some trace helpers for all prog types.
> 
> if it works under NMI and doesn't use any context-dependent things,
> should be fine for any program type. The detailed discussion is in [1].
> 
> [...]

Here is the summary with links:
  - [v3,bpf-next,1/2] bpf: Allow some trace helpers for all prog types
    https://git.kernel.org/bpf/bpf-next/c/ee971630f20f
  - [v3,sched_ext,2/2] sched_ext: Remove bpf_scx_get_func_proto
    https://git.kernel.org/bpf/bpf-next/c/8c112a428b94

You are awesome, thank you!
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