linux-kernel - Re: [PATCH 6/8] perf/x86/rapl: Get msr values from new probe framework

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Date:   Mon, 17 Jun 2019 13:42:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 6/8] perf/x86/rapl: Get msr values from new probe
 framework

On Sun, Jun 16, 2019 at 04:03:56PM +0200, Jiri Olsa wrote:

> +	cfg = array_index_nospec(cfg, NR_RAPL_DOMAINS + 1);

This one fails to build on i386. Istr we had issues like that before.
This makes it build.

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index ddad45ef8757..64ab51ffdf06 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -349,7 +349,7 @@ static int rapl_pmu_event_init(struct perf_event *event)
 	if (!cfg || cfg >= NR_RAPL_DOMAINS + 1)
 		return -EINVAL;
 
-	cfg = array_index_nospec(cfg, NR_RAPL_DOMAINS + 1);
+	cfg = array_index_nospec((long)cfg, NR_RAPL_DOMAINS + 1);
 	bit = cfg - 1;
 
 	/* check event supported */