Now that all the __prog suffix users in the kernel tree migrated to
KF_IMPLICIT_ARGS, remove it from the verifier.

See prior discussion for context [1].

[1] https://lore.kernel.org/bpf/CAEf4BzbgPfRm9BX=TsZm-TsHFAHcwhPY4vTt=9OT-uhWqf8tqw@mail.gmail.com/

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
---
 kernel/bpf/verifier.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 8e8570e9d167..919556614505 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -12211,13 +12211,6 @@ static bool is_kfunc_arg_irq_flag(const struct btf *btf, const struct btf_param
 	return btf_param_match_suffix(btf, arg, "__irq_flag");
 }
 
-static bool is_kfunc_arg_prog_aux(const struct btf *btf, const struct btf_param *arg);
-
-static bool is_kfunc_arg_prog(const struct btf *btf, const struct btf_param *arg)
-{
-	return btf_param_match_suffix(btf, arg, "__prog") || is_kfunc_arg_prog_aux(btf, arg);
-}
-
 static bool is_kfunc_arg_scalar_with_name(const struct btf *btf,
 					  const struct btf_param *arg,
 					  const char *name)
@@ -13280,8 +13273,8 @@ static int check_kfunc_args(struct bpf_verifier_env *env, struct bpf_kfunc_call_
 		if (is_kfunc_arg_ignore(btf, &args[i]))
 			continue;
 
-		if (is_kfunc_arg_prog(btf, &args[i])) {
-			/* Used to reject repeated use of __prog. */
+		if (is_kfunc_arg_prog_aux(btf, &args[i])) {
+			/* Reject repeated use bpf_prog_aux */
 			if (meta->arg_prog) {
 				verifier_bug(env, "Only 1 prog->aux argument supported per-kfunc");
 				return -EFAULT;
-- 
2.52.0