From b6347cb5e04e9c1d17342ab46e2ace2d448de727 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 3 Apr 2024 11:44:19 -0300 Subject: [PATCH] perf annotate: Initialize 'arch' variable not to trip some -Werror=maybe-uninitialized In some older distros the build is failing due to -Werror=maybe-uninitialized, in this case we know that this isn't the case because 'arch' gets initialized by evsel__get_arch(), so make sure it is initialized to NULL before returning from evsel__get_arch(), as suggested by Ian Rogers. E.g.: 32 17.12 opensuse:15.5 : FAIL gcc version 7.5.0 (SUSE Linux) util/annotate.c: In function 'hist_entry__get_data_type': util/annotate.c:2269:15: error: 'arch' may be used uninitialized in this function [-Werror=maybe-uninitialized] struct arch *arch; ^~~~ cc1: all warnings being treated as errors 43 7.30 ubuntu:18.04-x-powerpc64el : FAIL gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04) util/annotate.c: In function 'hist_entry__get_data_type': util/annotate.c:2351:36: error: 'arch' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (map__dso(ms->map)->kernel && arch__is(arch, "x86") && ^~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/lkml/CAP-5=fUqtjxAsmdGrnkjhUTLHs-JvV10TtxyocpYDJK_+LYTiQ@mail.gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/annotate.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index b795f27f26024..35235147b111e 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -838,8 +838,10 @@ static int evsel__get_arch(struct evsel *evsel, struct arch **parch) struct arch *arch; int err; - if (!arch_name) + if (!arch_name) { + *parch = NULL; return errno; + } *parch = arch = arch__find(arch_name); if (arch == NULL) { -- 2.30.2