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

[Peter Zijlstra]

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.