bpf: Add enum support to btf_ctx_access()

It allows bpf prog (e.g. tracing) to attach
to a kernel function that takes enum argument.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200109003459.3855366-1-kafai@fb.com

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 497ecf62d79d0b9f4d2f802333a7cce6f68f2bf1..6a5ccb748a723d29de6f0cbdd49c652a5ea1738c 100644 (file)
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3677,7 +3677,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type,
        /* skip modifiers */
        while (btf_type_is_modifier(t))
                t = btf_type_by_id(btf, t->type);
-       if (btf_type_is_int(t))
+       if (btf_type_is_int(t) || btf_type_is_enum(t))
                /* accessing a scalar */
                return true;
        if (!btf_type_is_ptr(t)) {