linux-hardening - Re: [PATCH v4 07/11] perf/x86/rapl: Add an argument to the cleanup and init functions

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Message-ID: <b087a806bbec50ce5752f6e09c70ed9ac4314c4c.camel@intel.com>
Date: Fri, 12 Jul 2024 03:22:30 +0000
From: "Zhang, Rui" <rui.zhang@...el.com>
To: "alexander.shishkin@...ux.intel.com" <alexander.shishkin@...ux.intel.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "Hunter, Adrian"
	<adrian.hunter@...el.com>, "mingo@...hat.com" <mingo@...hat.com>,
	"irogers@...gle.com" <irogers@...gle.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "gustavoars@...nel.org" <gustavoars@...nel.org>,
	"kan.liang@...ux.intel.com" <kan.liang@...ux.intel.com>, "kees@...nel.org"
	<kees@...nel.org>, "mark.rutland@....com" <mark.rutland@....com>,
	"peterz@...radead.org" <peterz@...radead.org>, "Dhananjay.Ugwekar@....com"
	<Dhananjay.Ugwekar@....com>, "bp@...en8.de" <bp@...en8.de>, "acme@...nel.org"
	<acme@...nel.org>, "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
	"jolsa@...nel.org" <jolsa@...nel.org>, "x86@...nel.org" <x86@...nel.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>
CC: "ravi.bangoria@....com" <ravi.bangoria@....com>, "kprateek.nayak@....com"
	<kprateek.nayak@....com>, "gautham.shenoy@....com" <gautham.shenoy@....com>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
	"sandipan.das@....com" <sandipan.das@....com>, "ananth.narayan@....com"
	<ananth.narayan@....com>, "linux-pm@...r.kernel.org"
	<linux-pm@...r.kernel.org>
Subject: Re: [PATCH v4 07/11] perf/x86/rapl: Add an argument to the cleanup
 and init functions

On Thu, 2024-07-11 at 10:24 +0000, Dhananjay Ugwekar wrote:
> Prep for per-core RAPL PMU addition.
> 
> No functional change.
> 
> Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>

Reviewed-by: Zhang Rui <rui.zhang@...el.com>

-rui

> ---
>  arch/x86/events/rapl.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 1d36565d0cb9..362e82284ccb 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -694,7 +694,7 @@ static void __init rapl_advertise(void)
>         }
>  }
>  
> -static void cleanup_rapl_pmus(void)
> +static void cleanup_rapl_pmus(struct rapl_pmus *rapl_pmus)
>  {
>         int i;
>  
> @@ -712,9 +712,10 @@ static const struct attribute_group
> *rapl_attr_update[] = {
>         NULL,
>  };
>  
> -static int __init init_rapl_pmus(void)
> +static int __init init_rapl_pmus(struct rapl_pmus **rapl_pmus_ptr)
>  {
>         int nr_rapl_pmu = topology_max_packages();
> +       struct rapl_pmus *rapl_pmus;
>  
>         if (!rapl_pmu_is_pkg_scope())
>                 nr_rapl_pmu *= topology_max_dies_per_package();
> @@ -738,6 +739,9 @@ static int __init init_rapl_pmus(void)
>         rapl_pmus->pmu.read             = rapl_pmu_event_read;
>         rapl_pmus->pmu.module           = THIS_MODULE;
>         rapl_pmus->pmu.capabilities     = PERF_PMU_CAP_NO_EXCLUDE;
> +
> +       *rapl_pmus_ptr = rapl_pmus;
> +
>         return 0;
>  }
>  
> @@ -879,7 +883,7 @@ static int __init rapl_pmu_init(void)
>         if (ret)
>                 return ret;
>  
> -       ret = init_rapl_pmus();
> +       ret = init_rapl_pmus(&rapl_pmus);
>         if (ret)
>                 return ret;
>  
> @@ -903,7 +907,7 @@ static int __init rapl_pmu_init(void)
>         cpuhp_remove_state(CPUHP_AP_PERF_X86_RAPL_ONLINE);
>  out:
>         pr_warn("Initialization failed (%d), disabled\n", ret);
> -       cleanup_rapl_pmus();
> +       cleanup_rapl_pmus(rapl_pmus);
>         return ret;
>  }
>  module_init(rapl_pmu_init);
> @@ -912,6 +916,6 @@ static void __exit intel_rapl_exit(void)
>  {
>         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_RAPL_ONLINE);
>         perf_pmu_unregister(&rapl_pmus->pmu);
> -       cleanup_rapl_pmus();
> +       cleanup_rapl_pmus(rapl_pmus);
>  }
>  module_exit(intel_rapl_exit);