linux-kernel - Re: [PATCH 1/2] perf kvm: Support refcnt in structure kvm

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Date:   Tue, 21 Mar 2023 22:22:35 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf kvm: Support refcnt in structure kvm_info

On Tue, Mar 21, 2023 at 10:00:56AM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > +static inline void __kvm_info__zput(struct kvm_info **ki)
> > +{
> > +	kvm_info__put(*ki);
> > +	*ki = NULL;
> > +}
> > +
> > +#define kvm_info__zput(ki) __kvm_info__zput(&ki)
> > +
> > +static inline struct kvm_info *kvm_info__new(void)
> > +{
> > +	struct kvm_info *ki;
> > +
> > +	ki = zalloc(sizeof(*ki));
> > +	if (ki)
> > +		refcount_set(&ki->refcnt, 1);
> > +
> > +	return ki;
> > +}
> > +
> >  #endif /* HAVE_KVM_STAT_SUPPORT */
> >  
> >  extern int kvm_add_default_arch_event(int *argc, const char **argv);
> 
> I had to add this:
> 
> Provide a nop version of kvm_info__zput() to be used when
> HAVE_KVM_STAT_SUPPORT isn't defined as it is used unconditionally in
> hists__findnew_entry() and hist_entry__delete().

Thanks a lot, Arnaldo.

Just want to check, before I sent out this series I have run building
test with the command `make -C tools/perf build-test` and I didn't see
the building failure.  Do I need to run other testing?

Thanks,
Leo