perf arm64: Fix build with refcount checking

With EXTRA_CFLAGS=-DREFCNT_CHECKING=1 and build-test, some unwrapped
map accesses appear. Wrap it in the new accessor to fix the error:

  error: 'struct perf_cpu_map' has no member named 'map'
Signed-off-by: James Clark <james.clark@arm.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230504160845.2065510-1-james.clark@arm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm64/util/header.c

@@ -29,8 +29,8 @@ static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus)
 		char path[PATH_MAX];
 		FILE *file;
 
-		scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
-				sysfs, cpus->map[cpu]);
+		scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d" MIDR,
+			  sysfs, RC_CHK_ACCESS(cpus)->map[cpu].cpu);
 
 		file = fopen(path, "r");
 		if (!file) {

tools/perf/arch/arm64/util/pmu.c

@@ -18,7 +18,7 @@ static struct perf_pmu *pmu__find_core_pmu(void)
 		 * The cpumap should cover all CPUs. Otherwise, some CPUs may
 		 * not support some events or have different event IDs.
 		 */
-		if (pmu->cpus->nr != cpu__max_cpu().cpu)
+		if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu)
 			return NULL;
 
 		return pmu;