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

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Date:   Fri, 6 Nov 2020 11:39:34 +0100
From:   KP Singh <kpsingh@...omium.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        bpf <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 Fri, Nov 6, 2020 at 3:14 AM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> 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 ?

Sure, I created a wrapper similar to pidfd_open and sent out a v6.