selftests/bpf: Update kfuncs using btf_struct_meta to new variants

Update selftests to use the new non-_impl kfuncs marked with
KF_IMPLICIT_ARGS by removing redundant declarations and macros from
bpf_experimental.h (the new kfuncs are present in the vmlinux.h) and
updating relevant callsites.

Fix spin_lock verifier-log matching for lock_id_kptr_preserve by
accepting variable instruction numbers. The calls to kfuncs with
implicit arguments do not have register moves (e.g. r5 = 0)
corresponding to dummy arguments anymore, so the order of instructions
has shifted.

Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260327203241.3365046-2-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

3 files changed, 9 insertions, 156 deletions

diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index 44466acf8083..2234bd6bc9d3 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -8,156 +8,11 @@
 
 #define __contains(name, node) __attribute__((btf_decl_tag("contains:" #name ":" #node)))
 
-/* Description
- *	Allocates an object of the type represented by 'local_type_id' in
- *	program BTF. User may use the bpf_core_type_id_local macro to pass the
- *	type ID of a struct in program BTF.
- *
- *	The 'local_type_id' parameter must be a known constant.
- *	The 'meta' parameter is rewritten by the verifier, no need for BPF
- *	program to set it.
- * Returns
- *	A pointer to an object of the type corresponding to the passed in
- *	'local_type_id', or NULL on failure.
- */
-extern void *bpf_obj_new_impl(__u64 local_type_id, void *meta) __ksym;
-
-/* Convenience macro to wrap over bpf_obj_new_impl */
-#define bpf_obj_new(type) ((type *)bpf_obj_new_impl(bpf_core_type_id_local(type), NULL))
-
-/* Description
- *	Free an allocated object. All fields of the object that require
- *	destruction will be destructed before the storage is freed.
- *
- *	The 'meta' parameter is rewritten by the verifier, no need for BPF
- *	program to set it.
- * Returns
- *	Void.
- */
-extern void bpf_obj_drop_impl(void *kptr, void *meta) __ksym;
-
-/* Convenience macro to wrap over bpf_obj_drop_impl */
-#define bpf_obj_drop(kptr) bpf_obj_drop_impl(kptr, NULL)
-
-/* Description
- *	Increment the refcount on a refcounted local kptr, turning the
- *	non-owning reference input into an owning reference in the process.
- *
- *	The 'meta' parameter is rewritten by the verifier, no need for BPF
- *	program to set it.
- * Returns
- *	An owning reference to the object pointed to by 'kptr'
- */
-extern void *bpf_refcount_acquire_impl(void *kptr, void *meta) __ksym;
-
-/* Convenience macro to wrap over bpf_refcount_acquire_impl */
-#define bpf_refcount_acquire(kptr) bpf_refcount_acquire_impl(kptr, NULL)
-
-/* Description
- *	Add a new entry to the beginning of the BPF linked list.
- *
- *	The 'meta' and 'off' parameters are rewritten by the verifier, no need
- *	for BPF programs to set them
- * Returns
- *	0 if the node was successfully added
- *	-EINVAL if the node wasn't added because it's already in a list
- */
-extern int bpf_list_push_front_impl(struct bpf_list_head *head,
-				    struct bpf_list_node *node,
-				    void *meta, __u64 off) __ksym;
-
-/* Convenience macro to wrap over bpf_list_push_front_impl */
-#define bpf_list_push_front(head, node) bpf_list_push_front_impl(head, node, NULL, 0)
-
-/* Description
- *	Add a new entry to the end of the BPF linked list.
- *
- *	The 'meta' and 'off' parameters are rewritten by the verifier, no need
- *	for BPF programs to set them
- * Returns
- *	0 if the node was successfully added
- *	-EINVAL if the node wasn't added because it's already in a list
- */
-extern int bpf_list_push_back_impl(struct bpf_list_head *head,
-				   struct bpf_list_node *node,
-				   void *meta, __u64 off) __ksym;
-
-/* Convenience macro to wrap over bpf_list_push_back_impl */
-#define bpf_list_push_back(head, node) bpf_list_push_back_impl(head, node, NULL, 0)
-
-/* Description
- *	Remove the entry at the beginning of the BPF linked list.
- * Returns
- *	Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
- */
-extern struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head) __ksym;
-
-/* Description
- *	Remove the entry at the end of the BPF linked list.
- * Returns
- *	Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
- */
-extern struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head) __ksym;
-
-/* Description
- *	Remove 'node' from rbtree with root 'root'
- * Returns
- * 	Pointer to the removed node, or NULL if 'root' didn't contain 'node'
- */
-extern struct bpf_rb_node *bpf_rbtree_remove(struct bpf_rb_root *root,
-					     struct bpf_rb_node *node) __ksym;
-
-/* Description
- *	Add 'node' to rbtree with root 'root' using comparator 'less'
- *
- *	The 'meta' and 'off' parameters are rewritten by the verifier, no need
- *	for BPF programs to set them
- * Returns
- *	0 if the node was successfully added
- *	-EINVAL if the node wasn't added because it's already in a tree
- */
-extern int bpf_rbtree_add_impl(struct bpf_rb_root *root, struct bpf_rb_node *node,
-			       bool (less)(struct bpf_rb_node *a, const struct bpf_rb_node *b),
-			       void *meta, __u64 off) __ksym;
-
-/* Convenience macro to wrap over bpf_rbtree_add_impl */
-#define bpf_rbtree_add(head, node, less) bpf_rbtree_add_impl(head, node, less, NULL, 0)
+/* Convenience macro to wrap over bpf_obj_new */
+#define bpf_obj_new(type) ((type *)bpf_obj_new(bpf_core_type_id_local(type)))
 
-/* Description
- *	Return the first (leftmost) node in input tree
- * Returns
- *	Pointer to the node, which is _not_ removed from the tree. If the tree
- *	contains no nodes, returns NULL.
- */
-extern struct bpf_rb_node *bpf_rbtree_first(struct bpf_rb_root *root) __ksym;
-
-/* Description
- *	Allocates a percpu object of the type represented by 'local_type_id' in
- *	program BTF. User may use the bpf_core_type_id_local macro to pass the
- *	type ID of a struct in program BTF.
- *
- *	The 'local_type_id' parameter must be a known constant.
- *	The 'meta' parameter is rewritten by the verifier, no need for BPF
- *	program to set it.
- * Returns
- *	A pointer to a percpu object of the type corresponding to the passed in
- *	'local_type_id', or NULL on failure.
- */
-extern void *bpf_percpu_obj_new_impl(__u64 local_type_id, void *meta) __ksym;
-
-/* Convenience macro to wrap over bpf_percpu_obj_new_impl */
-#define bpf_percpu_obj_new(type) ((type __percpu_kptr *)bpf_percpu_obj_new_impl(bpf_core_type_id_local(type), NULL))
-
-/* Description
- *	Free an allocated percpu object. All fields of the object that require
- *	destruction will be destructed before the storage is freed.
- *
- *	The 'meta' parameter is rewritten by the verifier, no need for BPF
- *	program to set it.
- * Returns
- *	Void.
- */
-extern void bpf_percpu_obj_drop_impl(void *kptr, void *meta) __ksym;
+/* Convenience macro to wrap over bpf_percpu_obj_new */
+#define bpf_percpu_obj_new(type) ((type __percpu_kptr *)bpf_percpu_obj_new(bpf_core_type_id_local(type)))
 
 struct bpf_iter_task_vma;
 
@@ -167,9 +22,6 @@ extern int bpf_iter_task_vma_new(struct bpf_iter_task_vma *it,
 extern struct vm_area_struct *bpf_iter_task_vma_next(struct bpf_iter_task_vma *it) __ksym;
 extern void bpf_iter_task_vma_destroy(struct bpf_iter_task_vma *it) __ksym;
 
-/* Convenience macro to wrap over bpf_obj_drop_impl */
-#define bpf_percpu_obj_drop(kptr) bpf_percpu_obj_drop_impl(kptr, NULL)
-
 /* Description
  *	Throw a BPF exception from the program, immediately terminating its
  *	execution and unwinding the stack. The supplied 'cookie' parameter
diff --git a/tools/testing/selftests/bpf/prog_tests/spin_lock.c b/tools/testing/selftests/bpf/prog_tests/spin_lock.c
index 254fbfeab06a..bbe476f4c47d 100644
--- a/tools/testing/selftests/bpf/prog_tests/spin_lock.c
+++ b/tools/testing/selftests/bpf/prog_tests/spin_lock.c
@@ -13,8 +13,9 @@ static struct {
 	const char *err_msg;
 } spin_lock_fail_tests[] = {
 	{ "lock_id_kptr_preserve",
-	  "5: (bf) r1 = r0                       ; R0=ptr_foo(id=2,ref_obj_id=2) "
-	  "R1=ptr_foo(id=2,ref_obj_id=2) refs=2\n6: (85) call bpf_this_cpu_ptr#154\n"
+	  "[0-9]\\+: (bf) r1 = r0                       ; R0=ptr_foo(id=2,ref_obj_id=2)"
+	  " R1=ptr_foo(id=2,ref_obj_id=2) refs=2\n"
+	  "[0-9]\\+: (85) call bpf_this_cpu_ptr#154\n"
 	  "R1 type=ptr_ expected=percpu_ptr_" },
 	{ "lock_id_global_zero",
 	  "; R1=map_value(map=.data.A,ks=4,vs=4)\n2: (85) call bpf_this_cpu_ptr#154\n"
diff --git a/tools/testing/selftests/bpf/progs/kptr_xchg_inline.c b/tools/testing/selftests/bpf/progs/kptr_xchg_inline.c
index 2414ac20b6d5..ca5943166057 100644
--- a/tools/testing/selftests/bpf/progs/kptr_xchg_inline.c
+++ b/tools/testing/selftests/bpf/progs/kptr_xchg_inline.c
@@ -25,14 +25,14 @@ __naked int kptr_xchg_inline(void)
 		"if r0 == 0 goto 1f;"
 		"r1 = r0;"
 		"r2 = 0;"
-		"call %[bpf_obj_drop_impl];"
+		"call %[bpf_obj_drop];"
 	"1:"
 		"r0 = 0;"
 		"exit;"
 		:
 		: __imm_addr(ptr),
 		  __imm(bpf_kptr_xchg),
-		  __imm(bpf_obj_drop_impl)
+		  __imm(bpf_obj_drop)
 		: __clobber_all
 	);
 }