linux-kernel - [mingo-tip:sched/headers 1637/2356] kernel/entry/kvm.c:15:4: error: implicit declaration of function 'clear_notify

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Date:   Tue, 19 Apr 2022 10:34:16 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 1637/2356] kernel/entry/kvm.c:15:4: error:
 implicit declaration of function 'clear_notify_signal' is invalid in C99

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   af93551cf39027d176f30b9beafc60a4c130998a
commit: 7056b88fee812761b8c015f328951fa1f7522a75 [1637/2356] headers/deps: syscalls: Optimize <linux/syscalls.h> dependencies
config: x86_64-randconfig-a014-20220418 (https://download.01.org/0day-ci/archive/20220419/202204191041.z5pcMgFP-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=7056b88fee812761b8c015f328951fa1f7522a75
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout 7056b88fee812761b8c015f328951fa1f7522a75
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> kernel/entry/kvm.c:15:4: error: implicit declaration of function 'clear_notify_signal' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                           clear_notify_signal();
                           ^
   1 error generated.


vim +/clear_notify_signal +15 kernel/entry/kvm.c

935ace2fb5cc49 Thomas Gleixner   2020-07-22   8  
935ace2fb5cc49 Thomas Gleixner   2020-07-22   9  static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
935ace2fb5cc49 Thomas Gleixner   2020-07-22  10  {
935ace2fb5cc49 Thomas Gleixner   2020-07-22  11  	do {
935ace2fb5cc49 Thomas Gleixner   2020-07-22  12  		int ret;
935ace2fb5cc49 Thomas Gleixner   2020-07-22  13  
7c5d8fa6fbb12a Eric W. Biederman 2022-02-09  14  		if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) {
7c5d8fa6fbb12a Eric W. Biederman 2022-02-09 @15  			clear_notify_signal();
7c5d8fa6fbb12a Eric W. Biederman 2022-02-09  16  			if (task_work_pending(current))
7c5d8fa6fbb12a Eric W. Biederman 2022-02-09  17  				task_work_run();
7c5d8fa6fbb12a Eric W. Biederman 2022-02-09  18  		}
12db8b690010cc Jens Axboe        2020-10-26  19  
935ace2fb5cc49 Thomas Gleixner   2020-07-22  20  		if (ti_work & _TIF_SIGPENDING) {
935ace2fb5cc49 Thomas Gleixner   2020-07-22  21  			kvm_handle_signal_exit(vcpu);
935ace2fb5cc49 Thomas Gleixner   2020-07-22  22  			return -EINTR;
935ace2fb5cc49 Thomas Gleixner   2020-07-22  23  		}
935ace2fb5cc49 Thomas Gleixner   2020-07-22  24  
935ace2fb5cc49 Thomas Gleixner   2020-07-22  25  		if (ti_work & _TIF_NEED_RESCHED)
935ace2fb5cc49 Thomas Gleixner   2020-07-22  26  			schedule();
935ace2fb5cc49 Thomas Gleixner   2020-07-22  27  
3c532798ec96b6 Jens Axboe        2020-10-03  28  		if (ti_work & _TIF_NOTIFY_RESUME)
03248addadf1a5 Eric W. Biederman 2022-02-09  29  			resume_user_mode_work(NULL);
935ace2fb5cc49 Thomas Gleixner   2020-07-22  30  
935ace2fb5cc49 Thomas Gleixner   2020-07-22  31  		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
935ace2fb5cc49 Thomas Gleixner   2020-07-22  32  		if (ret)
935ace2fb5cc49 Thomas Gleixner   2020-07-22  33  			return ret;
935ace2fb5cc49 Thomas Gleixner   2020-07-22  34  
6ce895128b3bff Mark Rutland      2021-11-29  35  		ti_work = read_thread_flags();
935ace2fb5cc49 Thomas Gleixner   2020-07-22  36  	} while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
935ace2fb5cc49 Thomas Gleixner   2020-07-22  37  	return 0;
935ace2fb5cc49 Thomas Gleixner   2020-07-22  38  }
935ace2fb5cc49 Thomas Gleixner   2020-07-22  39  

:::::: The code at line 15 was first introduced by commit
:::::: 7c5d8fa6fbb12a3f0eefe8762bfede508e147cb3 task_work: Decouple TIF_NOTIFY_SIGNAL and task_work

:::::: TO: Eric W. Biederman <ebiederm@...ssion.com>
:::::: CC: Eric W. Biederman <ebiederm@...ssion.com>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp