Patch "perf symbols: Fixup symbol sizes before picking best ones" has been added to the 4.4-stable tree

Patch "perf symbols: Fixup symbol sizes before picking best ones" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    perf symbols: Fixup symbol sizes before picking best ones

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-symbols-fixup-symbol-sizes-before-picking-best-ones.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 432746f8e0b6a82ba832b771afe31abd51af6752 Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Thu, 1 Sep 2016 11:00:23 -0300
Subject: perf symbols: Fixup symbol sizes before picking best ones

From: Arnaldo Carvalho de Melo <acme@redhat.com>

commit 432746f8e0b6a82ba832b771afe31abd51af6752 upstream.

When we call symbol__fixup_duplicate() we use algorithms to pick the
"best" symbols for cases where there are various functions/aliases to an
address, and those check zero size symbols, which, before calling
symbol__fixup_end() are _all_ symbols in a just parsed kallsyms file.

So first fixup the end, then fixup the duplicates.

Found while trying to figure out why 'perf test vmlinux' failed, see the
output of 'perf test -v vmlinux' to see cases where the symbols picked
as best for vmlinux don't match the ones picked for kallsyms.

Cc: Anton Blanchard <anton@samba.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 694bf407b061 ("perf symbols: Add some heuristics for choosing the best duplicate symbol")
Link: http://lkml.kernel.org/n/tip-rxqvdgr0mqjdxee0kf8i2ufn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/perf/util/symbol-elf.c |    2 +-
 tools/perf/util/symbol.c     |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1091,8 +1091,8 @@ new_symbol:
 	 * For misannotated, zeroed, ASM function sizes.
 	 */
 	if (nr > 0) {
-		symbols__fixup_duplicate(&dso->symbols[map->type]);
 		symbols__fixup_end(&dso->symbols[map->type]);
+		symbols__fixup_duplicate(&dso->symbols[map->type]);
 		if (kmap) {
 			/*
 			 * We need to fixup this here too because we create new
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1278,8 +1278,8 @@ int dso__load_kallsyms(struct dso *dso,
 	if (kallsyms__delta(map, filename, &delta))
 		return -1;
 
-	symbols__fixup_duplicate(&dso->symbols[map->type]);
 	symbols__fixup_end(&dso->symbols[map->type]);
+	symbols__fixup_duplicate(&dso->symbols[map->type]);
 
 	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;


Patches currently in stable-queue which might be from acme@redhat.com are

queue-4.4/perf-hists-browser-fix-event-group-display.patch
queue-4.4/perf-symbols-check-symbol_conf.allow_aliases-for-kallsyms-loading-too.patch
queue-4.4/perf-stat-fix-interval-output-values.patch
queue-4.4/perf-symbols-fixup-symbol-sizes-before-picking-best-ones.patch