netdev - RE: [PATCH v4 bpf-next 01/13] bpf: Move the PTR_TO_BTF_ID check to check_reg

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Date:   Fri, 25 Sep 2020 06:36:31 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Martin KaFai Lau <kafai@...com>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com,
        Lorenz Bauer <lmb@...udflare.com>, netdev@...r.kernel.org
Subject: RE: [PATCH v4 bpf-next 01/13] bpf: Move the PTR_TO_BTF_ID check to
 check_reg_type()

Martin KaFai Lau wrote:
> check_reg_type() checks whether a reg can be used as an arg of a
> func_proto.  For PTR_TO_BTF_ID, the check is actually not
> completely done until the reg->btf_id is pointing to a
> kernel struct that is acceptable by the func_proto.
> 
> Thus, this patch moves the btf_id check into check_reg_type().
> "arg_type" and "arg_btf_id" are passed to check_reg_type() instead of
> "compatible".  The compatible_reg_types[] usage is localized in
> check_reg_type() now.
> 
> The "if (!btf_id) verbose(...); " is also removed since it won't happen.
> 
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>