perf maps: Add functions to access maps

Introduce functions to access struct maps. These functions reduce the
number of places reference counting is necessary. While tidying APIs do
some small const-ification, in particlar to unwind_libunwind_ops.

Committer notes:

Fixed up tools/perf/util/unwind-libunwind.c:

-               return ops->get_entries(cb, arg, thread, data, max_stack);
+               return ops->get_entries(cb, arg, thread, data, max_stack, best_effort);

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Miaoqian Lin <linmq006@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Shunsuke Nakamura <nakamura.shun@fujitsu.com>
Cc: Song Liu <song@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Yury Norov <yury.norov@gmail.com>
Link: https://lore.kernel.org/r/20230320212248.1175731-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 7620cfa114d4..a99dbde656a2 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -234,7 +234,7 @@ bool __map__is_kernel(const struct map *map)
 {
 	if (!map->dso->kernel)
 		return false;
-	return machine__kernel_map(map__kmaps((struct map *)map)->machine) == map;
+	return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
 }
 
 bool __map__is_extra_kernel_map(const struct map *map)
@@ -475,11 +475,15 @@ u64 map__rip_2objdump(struct map *map, u64 rip)
 	 * kcore may not either. However the trampoline object code is on the
 	 * main kernel map, so just use that instead.
 	 */
-	if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
-		struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
+	if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) {
+		struct machine *machine = maps__machine(kmap->kmaps);
 
-		if (kernel_map)
-			map = kernel_map;
+		if (machine) {
+			struct map *kernel_map = machine__kernel_map(machine);
+
+			if (kernel_map)
+				map = kernel_map;
+		}
 	}
 
 	if (!map->dso->adjust_symbols)