netdev - Re: [PATCH v7 tip 3/8] tracing: allow BPF programs to call bpf_ktime_get

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Message-ID: <20150319114145.53f0755d@gandalf.local.home>
Date:	Thu, 19 Mar 2015 11:41:45 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <daniel@...earbox.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-api@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 tip 3/8] tracing: allow BPF programs to call
 bpf_ktime_get_ns()

On Thu, 19 Mar 2015 08:38:05 -0700
Alexei Starovoitov <ast@...mgrid.com> wrote:

> > Hmm, a nanosecond value returned as integer? Is there a way to make
> > this a 64 bit return type, or is RET_INTEGER default to 64 bits in BPF
> > functions?
> 
> RET_INTEGER doesn't mean C 'int' width. It means non-pointer and
> non-void value. The return value is always promoted to full
> register width which is 64-bit.
> 

OK.

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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