linux-kernel - Re: [PATCH 07/10] perf: Directly pass PERF_AUX_* flags to perf_aux_output

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Date:   Fri, 17 Feb 2017 14:42:55 +0000
From:   Will Deacon <will.deacon@....com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
        mark.rutland@....com, kim.phillips@....com, alex.bennee@...aro.org,
        christoffer.dall@...aro.org, tglx@...utronix.de,
        peterz@...radead.org, robh@...nel.org, suzuki.poulose@....com,
        pawel.moll@....com, mathieu.poirier@...aro.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] perf: Directly pass PERF_AUX_* flags to
 perf_aux_output_end

On Fri, Feb 17, 2017 at 04:06:59PM +0200, Alexander Shishkin wrote:
> Will Deacon <will.deacon@....com> writes:
> 
> > On Fri, Feb 17, 2017 at 03:40:23PM +0200, Alexander Shishkin wrote:
> >> Will Deacon <will.deacon@....com> 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