Re: [PATCH v4 07/11] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head()

From: Leo Yan <leo.yan@linaro.org>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@linaro.org>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 07/11] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head()
Date: Tue, 13 Jul 2021 21:10:18 +0800	[thread overview]
Message-ID: <20210713131018.GB748506@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <4c65b6ba-2258-ff36-2ecc-92219e61e578@intel.com>

On Mon, Jul 12, 2021 at 05:32:11PM +0300, Adrian Hunter wrote:

[...]

> > --- a/tools/perf/util/auxtrace.c
> > +++ b/tools/perf/util/auxtrace.c
> > @@ -1686,13 +1686,12 @@ static int __auxtrace_mmap__read(struct mmap *map,
> >  	union perf_event ev;
> >  	void *data1, *data2;
> >  
> > +	head = auxtrace_mmap__read_head(mm);
> > +
> >  	if (snapshot) {
> > -		head = auxtrace_mmap__read_snapshot_head(mm);
> >  		if (auxtrace_record__find_snapshot(itr, mm->idx, mm, data,
> >  						   &head, &old))
> 
> That leaves a nested 'if' which is not kernel style i.e. could be
> 
> 	if (snapshot &&
> 	    auxtrace_record__find_snapshot(itr, mm->idx, mm, data, &head, &old))

Will refine in next spin, thanks for suggestion!

> >  			return -1;
> > -	} else {
> > -		head = auxtrace_mmap__read_head(mm);
> >  	}
> >  
> >  	if (old == head)