linux-kernel - Re: [PATCH] x86/kernel: remove unneeded dead-store initialization

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Date:   Wed, 7 Apr 2021 14:02:39 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        hpa@...or.com, nathan@...nel.org, ndesaulniers@...gle.com,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] x86/kernel: remove unneeded dead-store initialization

On Wed, Mar 31, 2021 at 04:00:24PM +0800, Yang Li wrote:
> make clang-analyzer on x86_64 defconfig caught my attention with:

I can't trigger this here using:

make CC=clang-11 -j16 clang-analyzer

I get all kinds of missing python scripts:

multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
  File "/usr/lib/python3.9/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib/python3.9/multiprocessing/pool.py", line 48, in mapstar
    return list(map(*args))
  File "/mnt/kernel/kernel/linux/./scripts/clang-tools/run-clang-tools.py", line 54, in run_analysis
    p = subprocess.run(["clang-tidy", "-p", args.path, checks, entry["file"]],
  File "/usr/lib/python3.9/subprocess.py", line 501, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.9/subprocess.py", line 947, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.9/subprocess.py", line 1819, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'clang-tidy'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/mnt/kernel/kernel/linux/./scripts/clang-tools/run-clang-tools.py", line 74, in <module>
    main()
  File "/mnt/kernel/kernel/linux/./scripts/clang-tools/run-clang-tools.py", line 70, in main
    pool.map(run_analysis, datastore)
  File "/usr/lib/python3.9/multiprocessing/pool.py", line 364, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/usr/lib/python3.9/multiprocessing/pool.py", line 771, in get
    raise self._value
FileNotFoundError: [Errno 2] No such file or directory: 'clang-tidy'
make: *** [Makefile:1914: clang-analyzer] Error 1

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette