3.16.82-rc1 review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu mhiramat@kernel.org
commit eb6933b29d20bf2c3053883d409a53f462c1a3ac upstream.
Fix perf probe to probe an inlne function which has no entry pc or low pc but only has ranges attribute.
This seems very rare case, but I could find a few examples, as same as probe_point_search_cb(), use die_entrypc() to get the entry address in probe_point_inline_cb() too.
Without this patch:
# perf probe -D __amd_put_nb_event_constraints Failed to get entry address of __amd_put_nb_event_constraints. Probe point '__amd_put_nb_event_constraints' not found. Error: Failed to add events.
With this patch:
# perf probe -D __amd_put_nb_event_constraints p:probe/__amd_put_nb_event_constraints amd_put_event_constraints+43
Committer testing:
Before:
[root@quaco ~]# perf probe -D __amd_put_nb_event_constraints Failed to get entry address of __amd_put_nb_event_constraints. Probe point '__amd_put_nb_event_constraints' not found. Error: Failed to add events. [root@quaco ~]#
After:
[root@quaco ~]# perf probe -D __amd_put_nb_event_constraints p:probe/__amd_put_nb_event_constraints _text+33789 [root@quaco ~]#
Fixes: 4ea42b181434 ("perf: Add perf probe subcommand, a kprobe-event setup helper") Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Jiri Olsa jolsa@redhat.com Cc: Namhyung Kim namhyung@kernel.org Link: http://lore.kernel.org/lkml/157199320336.8075.16189530425277588587.stgit@dev... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- tools/perf/util/probe-finder.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -858,7 +858,7 @@ static int probe_point_inline_cb(Dwarf_D ret = find_probe_point_lazy(in_die, pf); else { /* Get probe address */ - if (dwarf_entrypc(in_die, &addr) != 0) { + if (die_entrypc(in_die, &addr) != 0) { pr_warning("Failed to get entry address of %s.\n", dwarf_diename(in_die)); return -ENOENT;