linux-kernel - [peterz-queue:sched/cleanup 38/40] kernel/irq_work.c:44:6: warning: no previous prototype for function 'irq_work

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Message-ID: <202110071515.2ivww4qz-lkp@intel.com>
Date:   Thu, 7 Oct 2021 15:39:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [peterz-queue:sched/cleanup 38/40] kernel/irq_work.c:44:6: warning:
 no previous prototype for function 'irq_work_single'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/cleanup
head:   c87bd97277563de19b33bf10e866066c5bafdce0
commit: 341a293f500354cbc5f3647ea1b905574c3bced0 [38/40] irq_work: Provide irq_work_queue_remote()
config: riscv-randconfig-r042-20211007 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 58b68e70ebf6308f982426a2618782f473218eed)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=341a293f500354cbc5f3647ea1b905574c3bced0
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/cleanup
        git checkout 341a293f500354cbc5f3647ea1b905574c3bced0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> kernel/irq_work.c:44:6: warning: no previous prototype for function 'irq_work_single' [-Wmissing-prototypes]
   void irq_work_single(void *arg)
        ^
   kernel/irq_work.c:44:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void irq_work_single(void *arg)
   ^
   static 
   1 warning generated.


vim +/irq_work_single +44 kernel/irq_work.c

    43	
  > 44	void irq_work_single(void *arg)
    45	{
    46		struct irq_work *work = arg;
    47		int flags;
    48	
    49		/*
    50		 * Clear the PENDING bit, after this point the @work can be re-used.
    51		 * The PENDING bit acts as a lock, and we own it, so we can clear it
    52		 * without atomic ops.
    53		 */
    54		flags = atomic_read(&work->node.a_flags);
    55		flags &= ~IRQ_WORK_PENDING;
    56		atomic_set(&work->node.a_flags, flags);
    57	
    58		/*
    59		 * See irq_work_claim().
    60		 */
    61		smp_mb();
    62	
    63		lockdep_irq_work_enter(flags);
    64		work->func(work);
    65		lockdep_irq_work_exit(flags);
    66	
    67		/*
    68		 * Clear the BUSY bit, if set, and return to the free state if no-one
    69		 * else claimed it meanwhile.
    70		 */
    71		(void)atomic_cmpxchg(&work->node.a_flags, flags, flags & ~IRQ_WORK_BUSY);
    72	}
    73	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (35124 bytes)