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 16:06:59 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Will Deacon <will.deacon@....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

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.

Regards,
--
Alex