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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Sun, 5 May 2019 00:05:06 -0700
Message-ID: <CAADnVQKOR7NJ=zDLndJpTnVjnkjr1UrtWG_2vwgJK3QcCAADcA@mail.gmail.com>
Subject: Re: [PATCH v2] tools/bpf: fix perf build error with uClibc (seen on ARC)
To:     Y Song <ys114321@gmail.com>
Cc:     Vineet Gupta <Vineet.Gupta1@synopsys.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        netdev <netdev@vger.kernel.org>, Wang Nan <wangnan0@huawei.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Martin KaFai Lau <kafai@fb.com>, bpf <bpf@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-snps-arc@lists.infradead.org,
        linux-perf-users@vger.kernel.org,
        Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
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On Thu, May 2, 2019 at 1:20 PM Y Song <ys114321@gmail.com> wrote:
>
> On Thu, May 2, 2019 at 8:57 AM Vineet Gupta <Vineet.Gupta1@synopsys.com> wrote:
> >
> > When build perf for ARC recently, there was a build failure due to lack
> > of __NR_bpf.
> >
> > | Auto-detecting system features:
> > |
> > | ...                     get_cpuid: [ OFF ]
> > | ...                           bpf: [ on  ]
> > |
> > | #  error __NR_bpf not defined. libbpf does not support your arch.
> >     ^~~~~
> > | bpf.c: In function 'sys_bpf':
> > | bpf.c:66:17: error: '__NR_bpf' undeclared (first use in this function)
> > |  return syscall(__NR_bpf, cmd, attr, size);
> > |                 ^~~~~~~~
> > |                 sys_bpf
> >
> > Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>
> Acked-by: Yonghong Song <yhs@fb.com>

Applied. Thanks