netdev - Re: [PATCH bpf-next v2 3/3] samples: bpf: syscal

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Date:   Mon, 19 Aug 2019 14:17:19 -0700
From:   "Jonathan Lemon" <jlemon@...gsvamp.com>
To:     "Ivan Khoronzhuk" <ivan.khoronzhuk@...aro.org>
Cc:     magnus.karlsson@...el.com, bjorn.topel@...el.com,
        davem@...emloft.net, hawk@...nel.org, john.fastabend@...il.com,
        jakub.kicinski@...ronome.com, daniel@...earbox.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        xdp-newbies@...r.kernel.org, linux-kernel@...r.kernel.org,
        yhs@...com, andrii.nakryiko@...il.com
Subject: Re: [PATCH bpf-next v2 3/3] samples: bpf: syscal_nrs: use mmap2 if
 defined



On 15 Aug 2019, at 5:13, Ivan Khoronzhuk wrote:

> For arm32 xdp sockets mmap2 is preferred, so use it if it's defined.
> Declaration of __NR_mmap can be skipped and it breaks build.
>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>


> ---
>  samples/bpf/syscall_nrs.c  |  6 ++++++
>  samples/bpf/tracex5_kern.c | 13 +++++++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c
> index 516e255cbe8f..88f940052450 100644
> --- a/samples/bpf/syscall_nrs.c
> +++ b/samples/bpf/syscall_nrs.c
> @@ -9,5 +9,11 @@ void syscall_defines(void)
>  	COMMENT("Linux system call numbers.");
>  	SYSNR(__NR_write);
>  	SYSNR(__NR_read);
> +#ifdef __NR_mmap2
> +	SYSNR(__NR_mmap2);
> +#endif
> +#ifdef __NR_mmap
>  	SYSNR(__NR_mmap);
> +#endif
> +
>  }
> diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
> index f57f4e1ea1ec..35cb0eed3be5 100644
> --- a/samples/bpf/tracex5_kern.c
> +++ b/samples/bpf/tracex5_kern.c
> @@ -68,12 +68,25 @@ PROG(SYS__NR_read)(struct pt_regs *ctx)
>  	return 0;
>  }
>
> +#ifdef __NR_mmap2
> +PROG(SYS__NR_mmap2)(struct pt_regs *ctx)
> +{
> +	char fmt[] = "mmap2\n";
> +
> +	bpf_trace_printk(fmt, sizeof(fmt));
> +	return 0;
> +}
> +#endif
> +
> +#ifdef __NR_mmap
>  PROG(SYS__NR_mmap)(struct pt_regs *ctx)
>  {
>  	char fmt[] = "mmap\n";
> +
>  	bpf_trace_printk(fmt, sizeof(fmt));
>  	return 0;
>  }
> +#endif
>
>  char _license[] SEC("license") = "GPL";
>  u32 _version SEC("version") = LINUX_VERSION_CODE;
> -- 
> 2.17.1