linux-kernel - Re: [RFC] Re: [PATCH v3 1/2] tracing/syscalls: Rename variable 'nr' to '__syscall

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Message-ID: <20160227151357.GE6356@twins.programming.kicks-ass.net>
Date:	Sat, 27 Feb 2016 16:13:57 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Taeung Song <treeze.taeung@...il.com>,
	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [RFC] Re: [PATCH v3 1/2] tracing/syscalls: Rename variable 'nr'
 to '__syscall_nr'

On Fri, Feb 26, 2016 at 10:57:13AM -0300, Arnaldo Carvalho de Melo wrote:

> Ingo, Peter, have you guys followed this case?
> 
> Summary: Some tracepoint have multiple fields with the same name, 'nr',
>          the first one is a unique syscall ID, the other is a syscall
>          argument:

I'm all for pushing the limits on tracepoint ABI. I'm all for making it
less rigid. So if we can get away with changing this under the promise
of helping fixup fallout, I'm all for it.

That means we can always just change tracepoints, and they're not really
ABI at all.