Re: [PATCH] selftests/bpf: Add bpf_probe_read_str to bpf_helpers.h

[Daniel Borkmann <daniel@iogearbox.net>]

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@oracle.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