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

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Message-ID: <20151211182157.GC59096@ast-mbp.thefacebook.com>
Date:	Fri, 11 Dec 2015 10:21:58 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	pi3orama <pi3orama@....com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Wang Nan <wangnan0@...wei.com>, namhyung@...nel.org,
	linux-kernel@...r.kernel.org, mingo@...nel.org, lizefan@...wei.com,
	Alexei Starovoitov <ast@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH v4 09/16] perf tools: Enable indices setting syntax for
 BPF maps

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.

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