Re: [PATCH 07/10] perf: Directly pass PERF_AUX_* flags to perf_aux_output_end

[Will Deacon]

On Fri, Feb 17, 2017 at 04:06:59PM +0200, Alexander Shishkin wrote:
> Will Deacon <will.deacon@xxxxxxx> writes:
> 
> > On Fri, Feb 17, 2017 at 03:40:23PM +0200, Alexander Shishkin wrote:
> >> Will Deacon <will.deacon@xxxxxxx> writes:
> >> 
> >> > @@ -485,7 +485,8 @@ int intel_bts_interrupt(void)
> >> >  		return handled;
> >> >  
> >> >  	perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0),
> >> > -			    !!local_xchg(&buf->lost, 0));
> >> > +			    local_xchg(&buf->lost, 0) ?
> >> > +			    PERF_AUX_FLAG_OVERWRITE : 0);
> >> 
> >> Heh, this one would have taken some time to debug. :)
> >
> > Don't worry, this isn't a bug fix! This patch changes the prototype for
> > perf_aux_output_end so that it takes the flag instead of a "bool truncated"
> > parameter, so this is just fixing up the callers at the same time.
> 
> Yeah, I got that, what I'm saying is that the above should be
> PERF_AUX_FLAG_TRUNCATED, not OVERWRITE. I only spotted it by accident.

D'oh, quite right, I'll fix that now. Thanks for having a look.

Will