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Message-ID: <CANLsYkxHws7JRCU9EfGsK3wQxugP5w8aVTTja=fBRn1=TqETMA@mail.gmail.com>
Date: Tue, 3 Jul 2018 11:37:17 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: brueckner@...ux.ibm.com
Cc: Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>, ast@...nel.org,
Greg KH <gregkh@...uxfoundation.org>,
"H. Peter Anvin" <hpa@...or.com>, linux-s390@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/6] perf/aux: Make perf_event accessible to setup_aux()
On Tue, 3 Jul 2018 at 01:31, Hendrik Brueckner <brueckner@...ux.ibm.com> wrote:
>
> On Mon, Jul 02, 2018 at 04:33:28PM -0600, Mathieu Poirier wrote:
> > It can be advantagous to have access to all the information conveyed by
> > a perf_event when setting up the AUX buffer, as it is the case when
> > dealing with PMU specific driver configuration communicated to the kernel
> > using an ioctl() call.
> >
> > As such simply replace the cpu information by the complete perf_event
> > structure and change all affected customers.
> >
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > ---
> > arch/s390/kernel/perf_cpum_sf.c | 4 ++--
> > arch/x86/events/intel/bts.c | 4 +++-
> > arch/x86/events/intel/pt.c | 5 +++--
> > drivers/hwtracing/coresight/coresight-etm-perf.c | 6 +++---
> > drivers/perf/arm_spe_pmu.c | 6 +++---
> > include/linux/perf_event.h | 2 +-
> > kernel/events/ring_buffer.c | 2 +-
> > 7 files changed, 16 insertions(+), 13 deletions(-)
> >
> > diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
> > index 0292d68e7dde..e06daaa08894 100644
> > --- a/arch/s390/kernel/perf_cpum_sf.c
> > +++ b/arch/s390/kernel/perf_cpum_sf.c
> > @@ -1601,8 +1601,8 @@ static void aux_buffer_free(void *data)
> > *
> > * Return the private AUX buffer structure if success or NULL if fails.
> > */
> > -static void *aux_buffer_setup(int cpu, void **pages, int nr_pages,
> > - bool snapshot)
> > +static void *aux_buffer_setup(struct perf_event *event, void **pages,
> > + int nr_pages, bool snapshot);
>
> Please remove the trailing semi-colon (;) in the function definition causing
> the kbuild error. Also, it would be great if you also could update the
> function comment and replace the @cpu by the @event.
Had I realised it was just as easy to compile for s390 as it is for
ARM64, I would have done so ahead of time. Well done on that front.
All fixed now.
Thanks,
Mathieu
>
> Many thanks.
>
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