bpf: Remove unused parameter from find_kfunc_desc_btf()

The func_id parameter in find_kfunc_desc_btf() is not used, get rid of it.

Fixes: 2357672 ("bpf: Introduce BPF support for kernel module function calls")
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/20220505070114.3522522-1-ytcoode@gmail.com

Author: ytcoode

kernel/bpf/verifier.c

@@ -1815,8 +1815,7 @@ void bpf_free_kfunc_btf_tab(struct bpf_kfunc_btf_tab *tab)
 	kfree(tab);
 }
 
-static struct btf *find_kfunc_desc_btf(struct bpf_verifier_env *env,
-				       u32 func_id, s16 offset)
+static struct btf *find_kfunc_desc_btf(struct bpf_verifier_env *env, s16 offset)
 {
 	if (offset) {
 		if (offset < 0) {
@@ -1891,7 +1890,7 @@ static int add_kfunc_call(struct bpf_verifier_env *env, u32 func_id, s16 offset)
 		prog_aux->kfunc_btf_tab = btf_tab;
 	}
 
-	desc_btf = find_kfunc_desc_btf(env, func_id, offset);
+	desc_btf = find_kfunc_desc_btf(env, offset);
 	if (IS_ERR(desc_btf)) {
 		verbose(env, "failed to find BTF for kernel function\n");
 		return PTR_ERR(desc_btf);
@@ -2360,7 +2359,7 @@ static const char *disasm_kfunc_name(void *data, const struct bpf_insn *insn)
 	if (insn->src_reg != BPF_PSEUDO_KFUNC_CALL)
 		return NULL;
 
-	desc_btf = find_kfunc_desc_btf(data, insn->imm, insn->off);
+	desc_btf = find_kfunc_desc_btf(data, insn->off);
 	if (IS_ERR(desc_btf))
 		return "<error>";
 
@@ -7237,7 +7236,7 @@ static int check_kfunc_call(struct bpf_verifier_env *env, struct bpf_insn *insn,
 	if (!insn->imm)
 		return 0;
 
-	desc_btf = find_kfunc_desc_btf(env, insn->imm, insn->off);
+	desc_btf = find_kfunc_desc_btf(env, insn->off);
 	if (IS_ERR(desc_btf))
 		return PTR_ERR(desc_btf);