perf pmu: Move pmu__find_core_pmu() to pmus.c

pmu__find_core_pmu() more logically belongs in pmus.c because it
iterates over all PMUs, so move it to pmus.c

At the same time rename it to perf_pmus__find_core_pmu() to match the
naming convention in this file.

list_prepare_entry() can't be used in perf_pmus__scan_core() anymore now
that it's called from the same compilation unit. This is with -O2
(specifically -O1 -ftree-vrp -finline-functions
-finline-small-functions) which allow the bounds of the array
access to be determined at compile time. list_prepare_entry() subtracts
the offset of the 'list' member in struct perf_pmu from &core_pmus,
which isn't a struct perf_pmu. The compiler sees that pmu results in
&core_pmus - 8 and refuses to compile. At runtime this works because
list_for_each_entry_continue() always adds the offset back again before
dereferencing ->next, but it's technically undefined behavior. With
-fsanitize=undefined an additional warning is generated.

Using list_first_entry_or_null() to get the first entry here avoids
doing &core_pmus - 8 but has the same result and fixes both the compile
warning and the undefined behavior warning. There are other uses of
list_prepare_entry() in pmus.c, but the compiler doesn't seem to be
able to see that they can also be called with &core_pmus, so I won't
change any at this time.

Signed-off-by: James Clark <[e-mail]>
Reviewed-by: Ian Rogers <[e-mail]>
Reviewed-by: John Garry <[e-mail]>
Cc: Ravi Bangoria <[e-mail]>
Cc: Eduard Zingerman <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Jing Zhang <[e-mail]>
Cc: Haixin Yu <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

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

···
 
 const struct pmu_metrics_table *pmu_metrics_table__find(void)
 {
-	struct perf_pmu *pmu = pmu__find_core_pmu();
+	struct perf_pmu *pmu = perf_pmus__find_core_pmu();
 
 	if (pmu)
 		return perf_pmu__find_metrics_table(pmu);
···
 
 const struct pmu_events_table *pmu_events_table__find(void)
 {
-	struct perf_pmu *pmu = pmu__find_core_pmu();
+	struct perf_pmu *pmu = perf_pmus__find_core_pmu();
 
 	if (pmu)
 		return perf_pmu__find_events_table(pmu);
···
 {
 	char path[PATH_MAX];
 	unsigned long long slots = 0;
-	struct perf_pmu *pmu = pmu__find_core_pmu();
+	struct perf_pmu *pmu = perf_pmus__find_core_pmu();
 
 	if (pmu) {
 		perf_pmu__pathname_scnprintf(path, sizeof(path),

tools/perf/tests/expr.c

···
 	struct expr_parse_ctx *ctx;
 	bool is_intel = false;
 	char strcmp_cpuid_buf[256];
-	struct perf_pmu *pmu = pmu__find_core_pmu();
+	struct perf_pmu *pmu = perf_pmus__find_core_pmu();
 	char *cpuid = perf_pmu__getcpuid(pmu);
 	char *escaped_cpuid1, *escaped_cpuid2;
 

tools/perf/util/expr.c

···
 		       bool compute_ids __maybe_unused, const char *test_id)
 {
 	double ret;
-	struct perf_pmu *pmu = pmu__find_core_pmu();
+	struct perf_pmu *pmu = perf_pmus__find_core_pmu();
 	char *cpuid = perf_pmu__getcpuid(pmu);
 
 	if (!cpuid)

tools/perf/util/pmu.c

···
 	zfree(&pmu->id);
 	free(pmu);
 }
-
-struct perf_pmu *pmu__find_core_pmu(void)
-{
-	struct perf_pmu *pmu = NULL;
-
-	while ((pmu = perf_pmus__scan_core(pmu))) {
-		/*
-		 * The cpumap should cover all CPUs. Otherwise, some CPUs may
-		 * not support some events or have different event IDs.
-		 */
-		if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu)
-			return NULL;
-
-		return pmu;
-	}
-	return NULL;
-}

tools/perf/util/pmu.h

···
 struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name);
 struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus);
 void perf_pmu__delete(struct perf_pmu *pmu);
-struct perf_pmu *pmu__find_core_pmu(void);
+struct perf_pmu *perf_pmus__find_core_pmu(void);
 
 #endif /* __PMU_H */

tools/perf/util/pmus.c

···
 #include <pthread.h>
 #include <string.h>
 #include <unistd.h>
+#include "cpumap.h"
 #include "debug.h"
 #include "evsel.h"
 #include "pmus.h"
···
 {
 	if (!pmu) {
 		pmu_read_sysfs(/*core_only=*/true);
-		pmu = list_prepare_entry(pmu, &core_pmus, list);
+		return list_first_entry_or_null(&core_pmus, typeof(*pmu), list);
 	}
 	list_for_each_entry_continue(pmu, &core_pmus, list)
 		return pmu;
···
 		((struct evsel *)evsel)->pmu = pmu;
 	}
 	return pmu;
+}
+
+struct perf_pmu *perf_pmus__find_core_pmu(void)
+{
+	struct perf_pmu *pmu = NULL;
+
+	while ((pmu = perf_pmus__scan_core(pmu))) {
+		/*
+		 * The cpumap should cover all CPUs. Otherwise, some CPUs may
+		 * not support some events or have different event IDs.
+		 */
+		if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu)
+			return NULL;
+
+		return pmu;
+	}
+	return NULL;
 }