6.13-stable review patch. If anyone has any objections, please let me know.
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From: Christophe Leroy christophe.leroy@csgroup.eu
[ Upstream commit dae29277fddaaf6670d17dfcbb916a2ca29c912f ]
Since commit 659ad3492b913c90 ("perf maps: Switch from rbtree to lazily sorted array for addresses"), perf doesn't display anymore kernel symbols on powerpc, allthough it still detects them as kernel addresses.
# Overhead Command Shared Object Symbol # ........ .......... ............. ...................................... # 80.49% Coeur main [unknown] [k] 0xc005f0f8 3.91% Coeur main gau [.] engine_loop.constprop.0.isra.0 1.72% Coeur main [unknown] [k] 0xc005f11c 1.09% Coeur main [unknown] [k] 0xc01f82c8 0.44% Coeur main libc.so.6 [.] epoll_wait 0.38% Coeur main [unknown] [k] 0xc0011718 0.36% Coeur main [unknown] [k] 0xc01f45c0
This is because function maps__find_next_entry() now returns current entry instead of next entry, leading to kernel map end address getting mis-configured with its own start address instead of the start address of the following map.
Fix it by really taking the next entry, also make sure that entry follows current one by making sure entries are sorted.
Fixes: 659ad3492b913c90 ("perf maps: Switch from rbtree to lazily sorted array for addresses") Reviewed-by: Arnaldo Carvalho de Melo acme@redhat.com Reviewed-by: Ian Rogers irogers@google.com Signed-off-by: Christophe Leroy christophe.leroy@csgroup.eu 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: Kan Liang kan.liang@linux.intel.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/2ea4501209d5363bac71a6757fe91c0747558a42.173632992... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/maps.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c index 432399cbe5dd3..09c9cc326c08d 100644 --- a/tools/perf/util/maps.c +++ b/tools/perf/util/maps.c @@ -1136,8 +1136,13 @@ struct map *maps__find_next_entry(struct maps *maps, struct map *map) struct map *result = NULL;
down_read(maps__lock(maps)); + while (!maps__maps_by_address_sorted(maps)) { + up_read(maps__lock(maps)); + maps__sort_by_address(maps); + down_read(maps__lock(maps)); + } i = maps__by_address_index(maps, map); - if (i < maps__nr_maps(maps)) + if (++i < maps__nr_maps(maps)) result = map__get(maps__maps_by_address(maps)[i]);
up_read(maps__lock(maps));