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[ Upstream commitcc43764225] In Python3, the result of PyModule_Create (called from scripts/python/Perf-Trace-Util/Context.c) is not automatically added to sys.modules. See: https://bugs.python.org/issue4592 Below is the observed behavior without the fix: # ldd /usr/bin/perf | grep -i python libpython3.6m.so.1.0 => /usr/lib64/libpython3.6m.so.1.0 (0x00007f8e1dfb2000) # perf record /bin/false [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.015 MB perf.data (17 samples) ] # perf script -g python | cat generated Python script: perf-script.py # perf script -s ./perf-script.py Traceback (most recent call last): File "./perf-script.py", line 18, in <module> from perf_trace_context import * ModuleNotFoundError: No module named 'perf_trace_context' Error running python script ./perf-script.py # Committer notes: To build with python3 use: $ make -C tools/perf PYTHON=python3 Use a non-const variable to pass the 'name' arg to PyImport_AppendInittab(), as python2.6 has that as 'char *', which ends up trowing this in some environments: CC /tmp/build/perf/util/parse-branch-options.o util/scripting-engines/trace-event-python.c: In function 'python_start_script': util/scripting-engines/trace-event-python.c:1520:2: error: passing argument 1 of 'PyImport_AppendInittab' discards 'const' qualifier from pointer target type [-Werror] PyImport_AppendInittab("perf_trace_context", initfunc); ^ In file included from /usr/include/python2.6/Python.h:130:0, from util/scripting-engines/trace-event-python.c:22: /usr/include/python2.6/import.h:54:17: note: expected 'char *' but argument is of type 'const char *' PyAPI_FUNC(int) PyImport_AppendInittab(char *name, void (*initfunc)(void)); ^ cc1: all warnings being treated as errors Signed-off-by: Tony Jones <tonyj@suse.de> Acked-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jaroslav Škarvada <jskarvad@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: Seeteena Thoufeek <s1seetee@linux.vnet.ibm.com> Fixes:66dfdff03d("perf tools: Add Python 3 support") Link: http://lkml.kernel.org/r/20190124005229.16146-2-tonyj@suse.de Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.