Re: [PATCH v2] tools/bpf: fix perf build error with uClibc (seen on ARC)

[Y Song]

On Thu, May 2, 2019 at 8:57 AM Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>

Acked-by: Yonghong Song <yhs@xxxxxx>

> ---
> v1 -> v2
>   - Only add syscall nr for ARC, as asm-generic won't work with arm/sh [Y Song]
> ---
>  tools/lib/bpf/bpf.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> index 9cd015574e83..d82edadf7589 100644
> --- a/tools/lib/bpf/bpf.c
> +++ b/tools/lib/bpf/bpf.c
> @@ -46,6 +46,8 @@
>  #  define __NR_bpf 349
>  # elif defined(__s390__)
>  #  define __NR_bpf 351
> +# elif defined(__arc__)
> +#  define __NR_bpf 280
>  # else
>  #  error __NR_bpf not defined. libbpf does not support your arch.
>  # endif
> --
> 2.7.4
>