netdev - Re: [PATCH bpf-next v1 1/1] bpf: Annotate rqspinlock lock acquiring functions with __must

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Message-ID: <202511181716.vzqU1M8A-lkp@intel.com>
Date: Tue, 18 Nov 2025 18:12:00 +0800
From: kernel test robot <lkp@...el.com>
To: Amery Hung <ameryhung@...il.com>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	netdev@...r.kernel.org, alexei.starovoitov@...il.com,
	andrii@...nel.org, daniel@...earbox.net, memxor@...il.com,
	ameryhung@...il.com, kernel-team@...a.com
Subject: Re: [PATCH bpf-next v1 1/1] bpf: Annotate rqspinlock lock acquiring
 functions with __must_check

Hi Amery,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Amery-Hung/bpf-Annotate-rqspinlock-lock-acquiring-functions-with-__must_check/20251118-031838
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20251117191515.2934026-1-ameryhung%40gmail.com
patch subject: [PATCH bpf-next v1 1/1] bpf: Annotate rqspinlock lock acquiring functions with __must_check
config: i386-randconfig-002-20251118 (https://download.01.org/0day-ci/archive/20251118/202511181716.vzqU1M8A-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511181716.vzqU1M8A-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511181716.vzqU1M8A-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/locking/locktorture.c:372:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
     372 |         raw_res_spin_lock(&rqspinlock);
         |         ^~~~~~~~~~~~~~~~~ ~~~~~~~~~~~
   kernel/locking/locktorture.c:396:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
     396 |         raw_res_spin_lock_irqsave(&rqspinlock, flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/rqspinlock.h:255:48: note: expanded from macro 'raw_res_spin_lock_irqsave'
     255 | #define raw_res_spin_lock_irqsave(lock, flags) __raw_res_spin_lock_irqsave(lock, &flags)
         |                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~
   2 warnings generated.


vim +/warn_unused_result +372 kernel/locking/locktorture.c

a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  369  
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  370  static int torture_raw_res_spin_write_lock(int tid __maybe_unused)
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  371  {
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15 @372  	raw_res_spin_lock(&rqspinlock);
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  373  	return 0;
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  374  }
a6884f6f1dd565 Kumar Kartikeya Dwivedi 2025-03-15  375  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki