libperf cpumap: Remove use of perf_cpu_map__read()

JIRA: https://issues.redhat.com/browse/RHEL-73893

upstream
========
commit 9d9a83c
Author: Ian Rogers <irogers@google.com>
Date: Thu Dec 5 20:40:33 2024 -0800

description
===========
Remove use of a FILE and switch to reading a string that is then
passed to perf_cpu_map__new().

Being able to remove perf_cpu_map__read() avoids duplicated parsing
logic.

    Reviewed-by: Leo Yan <leo.yan@arm.com>
    Signed-off-by: Ian Rogers <irogers@google.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Ben Gainey <ben.gainey@arm.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: James Clark <james.clark@linaro.org>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Kyle Meyer <kyle.meyer@hpe.com>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: https://lore.kernel.org/r/20241206044035.1062032-7-irogers@google.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Michael Petlan <mpetlan@redhat.com>

Author: rfmvh

tools/lib/perf/cpumap.c

@@ -10,6 +10,7 @@
 #include <ctype.h>
 #include <limits.h>
 #include "internal.h"
+#include <api/fs/fs.h>
 
 #define MAX_NR_CPUS 4096
 
@@ -102,12 +103,12 @@ static struct perf_cpu_map *cpu_map__new_sysconf(void)
 static struct perf_cpu_map *cpu_map__new_sysfs_online(void)
 {
 	struct perf_cpu_map *cpus = NULL;
-	FILE *onlnf;
+	char *buf = NULL;
+	size_t buf_len;
 
-	onlnf = fopen("/sys/devices/system/cpu/online", "r");
-	if (onlnf) {
-		cpus = perf_cpu_map__read(onlnf);
-		fclose(onlnf);
+	if (sysfs__read_str("devices/system/cpu/online", &buf, &buf_len) >= 0) {
+		cpus = perf_cpu_map__new(buf);
+		free(buf);
 	}
 	return cpus;
 }