Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for BPF maps

From	"Wangnan (F)" <wangnan0@huawei.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for BPF maps
Date	2015-12-14 04:30 +0100
Message-ID	<qFrZM-we-11@gated-at.bofh.it> (permalink)
References	(1 earlier) <qDgcq-4Bz-31@gated-at.bofh.it> <qEuQ2-486-11@gated-at.bofh.it> <qEuQ3-486-31@gated-at.bofh.it> <qEvj4-4o4-11@gated-at.bofh.it> <qEAC5-862-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2015/12/12 2:21, Alexei Starovoitov wrote:
> On Fri, Dec 11, 2015 at 08:39:35PM +0800, pi3orama wrote:
>>> static u64 (*bpf_ktime_get_ns)(void) =
>>>      (void *)5;
>>> static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
>>>      (void *)6;
>>> static int (*bpf_get_smp_processor_id)(void) =
>>>      (void *)8;
>>> static int (*bpf_perf_event_output)(void *, struct bpf_map_def *, int,
>>> void *, unsigned long) =
>>>      (void *)23;
>>>
>>> Where can I get this magical mistery table? Could this be hidden away in
>>> some .h file automagically included in bpf scriptlets so that n00bies
>>> like me don't have to be wtf'ing?
>>>
>> They are function numbers defined in bpf.h and bpf-common.h, but they are Linux
>> headers. Directly include them causes many error for llvm. Also, the function
>> prototypes are BPF specific and can't included in Linux source. We should have
>> a place holds those indices and prototypes together.
> wait, what kind of errors?
> they are in uapi, so gets installed into /usr/include eventually
> and I haven't seen any erros either with gcc or clang.
>
Sorry. I saw error because I use

#include <linux/bpf.h>

It is okay if I use

#include <uapi/linux/bpf.h>

Thank you.

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Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for  BPF maps "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-14 04:30 +0100
  Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for  BPF maps Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-14 05:30 +0100
    Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for  BPF maps "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-14 05:50 +0100
      Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for  BPF maps Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-14 07:00 +0100

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