linux-kernel - Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

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Date:   Thu, 14 Jun 2018 22:03:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-kernel@...r.kernel.org, jolsa@...hat.com
Subject: Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

On Tue, Jun 12, 2018 at 10:51:15AM +0300, Alexander Shishkin wrote:
> +	ret = rb_output_aux(rb, data->aux.from, data->aux.to,
> +			    (aux_copyfn)perf_output_copy, handle);

If you look closely, you'll find that perf_output_copy() as 'unsigned
int' return type and your aux_copyfn has 'unsigned long'.

I'm thinking that the compiler is entirely in its right to make that
explode at random points in time.