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

[Tushar Dave]

On 02/28/2018 08:57 AM, Daniel Borkmann wrote:
> 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@xxxxxxxxxx>
>
> 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?
Okay, I will send new patch along with new sample or add usage of
bpf_probe_read_str() in one of our exiting sample :)

Thanks.
-Tushar
PS: adding correct mail-list this time linux-kselftest@xxxxxxxxxxxxxxx
> Thanks,
> Daniel