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

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Message-ID: <f7ff30a7-888f-bb3c-b6b5-48c82d5b0c08@oracle.com>
Date:   Wed, 28 Feb 2018 13:28:16 -0800
From:   Tushar Dave <tushar.n.dave@...cle.com>
To:     Daniel Borkmann <daniel@...earbox.net>, ast@...nel.org,
        shuah@...nel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/bpf: Add bpf_probe_read_str to bpf_helpers.h



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@...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?
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@...r.kernel.org
> 
> Thanks,
> Daniel
>