netdev - Re: [PATCH] selftests/bpf: Add bpf_probe_read_str to bpf

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Message-ID: <1d72361e-e8a7-38e0-16db-ade3f658ce92@iogearbox.net>
Date:   Wed, 28 Feb 2018 17:57:58 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Tushar Dave <tushar.n.dave@...cle.com>, ast@...nel.org,
        shuah@...nel.org, netdev@...r.kernel.org,
        linux-selftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/bpf: Add bpf_probe_read_str to bpf_helpers.h

Hi Tushar,

On 02/28/2018 01:33 AM, Tushar Dave wrote:
> Using bpf_probe_read_str() from samples/bpf causes compiler warning.
> e.g.
> warning: implicit declaration of function 'bpf_probe_read_str' is invalid in C99
>       [-Wimplicit-function-declaration]
>         num = bpf_probe_read_str(buf, sizeof(buf), ctx->di);
>               ^
> 1 warning generated.
> 
> Add bpf_probe_read_str() to bpf_helpers.h so it can be used by
> samples/bpf programs.
> 
> Signed-off-by: Tushar Dave <tushar.n.dave@...cle.com>

In general no objections to it, but it would need an in-tree
user first:

$ git grep -n bpf_probe_read_str tools/
tools/include/uapi/linux/bpf.h:596: * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
$

Why not adding this along with a sample?

Thanks,
Daniel