linux-kernel - [PATCH v3 0/2] perf probe: fix regression introduced by switch to die_get_decl

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Date:   Wed, 28 Jun 2023 10:45:48 +0200
From:   Georg Müller <georgmueller@....net>
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>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Georg Müller <georgmueller@....net>,
        regressions@...ts.linux.dev,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/2] perf probe: fix regression introduced by switch to die_get_decl_file

When switching from dwarf_decl_file() to die_get_decl_file(), a regression
was introduced when having a binary where the DWARF info is split to
multiple CUs. It is not possible to add probes to certain functions.

These patches introduce a testcase which shows the current regression
and a fix for the issue

Signed-off-by: Georg Müller <georgmueller@....net>
Link: https://lore.kernel.org/r/5a00d5a5-7be7-ef8a-4044-9a16249fff25@gmx.net/

---
Changes in v2:
 - Add testcase

Changes in v3:
 - start new thread
 - add stable to cc

Georg Müller (2):
  perf probe: add test for regression introduced by switch to
    die_get_decl_file
  perf probe: read DWARF files from the correct CU

 .../shell/test_uprobe_from_different_cu.sh    | 77 +++++++++++++++++++
 tools/perf/util/dwarf-aux.c                   |  4 +-
 2 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100755 tools/perf/tests/shell/test_uprobe_from_different_cu.sh

--
2.41.0