linux-kernel - [PATCH v3 37/50] perf maps: Fix up overlaps during fixup

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Message-Id: <20231024222353.3024098-38-irogers@google.com>
Date:   Tue, 24 Oct 2023 15:23:40 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Leo Yan <leo.yan@...aro.org>,
        Song Liu <song@...nel.org>,
        Sandipan Das <sandipan.das@....com>,
        James Clark <james.clark@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Liam Howlett <liam.howlett@...cle.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Ravi Bangoria <ravi.bangoria@....com>,
        German Gomez <german.gomez@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH v3 37/50] perf maps: Fix up overlaps during fixup_end

Maps are sometimes made overlapping, in particular kernel maps. If the
end of a map overlaps the start of the next, shorten the overlapping
map. This should remove potential non-determinism in maps__find, ie
finding maps by address.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/maps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index 01c15d0b300a..fba95a00ecdf 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -700,7 +700,7 @@ void maps__fixup_end(struct maps *maps)
 	down_write(maps__lock(maps));
 
 	maps__for_each_entry(maps, curr) {
-		if (prev != NULL && !map__end(prev->map))
+		if (prev && (!map__end(prev->map) || map__end(prev->map) > map__start(curr->map)))
 			map__set_end(prev->map, map__start(curr->map));
 
 		prev = curr;
-- 
2.42.0.758.gaed0368e0e-goog