linux-kernel - [REGRESSION][BISECT] perf/core: Remove pmu linear searching code

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Date:   Sun, 4 Jun 2023 13:38:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ravi Bangoria <ravi.bangoria@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc:     mark.rutland@....com, jolsa@...nel.org, irogers@...gle.com,
        bp@...en8.de, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: [REGRESSION][BISECT] perf/core: Remove pmu linear searching code

Hi,

#regzbot introduced: 9551fbb64d09

Bisect pointed to commit 9551fbb64d09 ("perf/core: Remove pmu linear
searching code") as first one where all hardware events are gone from
perf for ARMv7 Exynos5422 board.

Expected:
perf list | grep "Hardware event"
  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]


Result:
empty, no hardware events

1. Arch ARM Linux
2. exynos_defconfig
3. Board:
   - Odroid HC1
     ARMv7, octa-core (Cortex-A7+A15), Exynos5422 SoC
     Systemd: v239

4. perf version 6.1.0


Best regards,
Krzysztof