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Date:	Mon, 10 Nov 2014 07:14:19 -0700
From:	David Ahern <>
To:	Ingo Molnar <>,
	Arnaldo Carvalho de Melo <>
CC:	Peter Zijlstra <>,
	Vince Weaver <>,
	Stephane Eranian <>,
	Jiri Olsa <>,
	Andy Lutomirski <>,
	Thomas Gleixner <>,
	LKML <>
Subject: Re: [RFD] perf syscall error handling

On 11/10/14, 5:24 AM, Ingo Molnar wrote:
> Programmatic use in user-spaec is very simple - go with my
> initial example, tooling can either just display the error string
> and bail out, or do:
>    if (unlikely(error)) {
> 	if (!strcmp(attr->error_str, "x86/bts: BTS not supported by this CPU architecture")) {
> 		fprintf(stderr, "x86/BTS: No hardware support falling back to branch sampling\n");
> 		activate_x86_bts_fallback_code();
> 		goto out;
> 	}

That makes the exact string content part of the ABI. As I recall ftrace 
had a problem with format strings changing and tooling then limiting the 
ability to change it.

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