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 b77afa1f810f37bd8a36cb1318178dfe2d7af6b6 upstream.
Fix die_is_func_instance() to find range-only function instance.
In some case, a function instance can be made without any low PC or entry PC, but only with address ranges by optimization. (e.g. cold text partially in "text.unlikely" section) To find such function instance, we have to check the range attribute too.
Fixes: e1ecbbc3fa83 ("perf probe: Fix to handle optimized not-inlined functions") Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Cc: Jiri Olsa jolsa@redhat.com Cc: Namhyung Kim namhyung@kernel.org Link: http://lore.kernel.org/lkml/157190835669.1859.8368628035930950596.stgit@devn... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- tools/perf/util/dwarf-aux.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -288,10 +288,14 @@ bool die_is_func_def(Dwarf_Die *dw_die) bool die_is_func_instance(Dwarf_Die *dw_die) { Dwarf_Addr tmp; + Dwarf_Attribute attr_mem;
/* Actually gcc optimizes non-inline as like as inlined */ - return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0; + return !dwarf_func_inline(dw_die) && + (dwarf_entrypc(dw_die, &tmp) == 0 || + dwarf_attr(dw_die, DW_AT_ranges, &attr_mem) != NULL); } + /** * die_get_data_member_location - Get the data-member offset * @mb_die: a DIE of a member of a data structure