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[ Upstream commit8b93f8933d] In test_record_concurrent, as stderr is sent to /dev/null, error messages are hidden. Change this to gather the error messages and dump them on failure. Some minor sh->bash changes to add some more diagnostics in trap_cleanup. Reviewed-by: James Clark <james.clark@linaro.org> Signed-off-by: Ian Rogers <irogers@google.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.ibm.com> Cc: Blake Jones <blakejones@google.com> Cc: Chun-Tse Shao <ctshao@google.com> Cc: Collin Funk <collin.funk1@gmail.com> Cc: Howard Chu <howardchu95@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Polensky <japo@linux.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Li Huafei <lihuafei1@huawei.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Nam Cao <namcao@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steinar H. Gunderson <sesse@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20250821163820.1132977-5-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Stable-dep-of:3c723f4497("perf test: Fix lock contention test") Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.