linux-kernel - Re: [PATCH RFC v1 1/4] perf: Introduce extended syscall error reporting

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Date:	Wed, 5 Aug 2015 17:18:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Vince Weaver <vince@...ter.net>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH RFC v1 1/4] perf: Introduce extended syscall error
 reporting

On Fri, Jul 24, 2015 at 02:45:56PM +0300, Alexander Shishkin wrote:
> +/*
> + * Use part of the [-1, -MAX_ERRNO] errno range for perf's extended error
> + * reporting. Anything within [-PERF_ERRNO, -MAX_ERRNO] is an index of a
> + * perf_err_site structure within __perf_err section. 3.5k should be enough
> + * for everybody, but let's add a boot-time warning just in case it overflows
> + * one day.
> + */
> +#define PERF_ERRNO 512

linux/errno.h has 512-529 in use, so this range overlaps with 'normal'
errno values.
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