linux-kernel - Re: [PATCH bpf-next v5 8/9] bpf: Add tests for task_local

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Message-ID: <20201106021418.w34sar72sbddzwqo@ast-mbp>
Date:   Thu, 5 Nov 2020 18:14:18 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     KP Singh <kpsingh@...omium.org>
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Paul Turner <pjt@...gle.com>,
        Jann Horn <jannh@...gle.com>, Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCH bpf-next v5 8/9] bpf: Add tests for task_local_storage

On Thu, Nov 05, 2020 at 10:58:26PM +0000, KP Singh wrote:
> +
> +	ret = copy_file_range(fd_in, NULL, fd_out, NULL, stat.st_size, 0);

centos7 glibc doesn't have it.

/prog_tests/test_local_storage.c:59:8: warning: implicit declaration of function ‘copy_file_range’; did you mean ‘sync_file_range’? [-Wimplicit-function-declaration]
   59 |  ret = copy_file_range(fd_in, NULL, fd_out, NULL, stat.st_size, 0);
      |        ^~~~~~~~~~~~~~~
      |        sync_file_range
  BINARY   test_progs
  BINARY   test_progs-no_alu32
ld: test_local_storage.test.o: in function `copy_rm':
test_local_storage.c:59: undefined reference to `copy_file_range'

Could you use something else or wrap it similar to pidfd_open ?