linux-kernel - [ammarfaizi2-block:paulmck/linux-rcu/dev.2022.09.03a 36/36] kernel/rcu/srcutree.c:647:1: error: use of undeclared identifier 'u'

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Date:   Wed, 21 Sep 2022 09:14:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:paulmck/linux-rcu/dev.2022.09.03a 36/36]
 kernel/rcu/srcutree.c:647:1: error: use of undeclared identifier 'u'

tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev.2022.09.03a
head:   607762184099b5d0b6765f69673fafa1d7eb4d30
commit: 607762184099b5d0b6765f69673fafa1d7eb4d30 [36/36] srcu: Check for consistent per-CPU per-srcu_struct NMI safety
config: arm-randconfig-r013-20220921 (https://download.01.org/0day-ci/archive/20220921/202209210942.YUFSaizJ-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/607762184099b5d0b6765f69673fafa1d7eb4d30
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev.2022.09.03a
        git checkout 607762184099b5d0b6765f69673fafa1d7eb4d30
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/rcu/

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

All errors (new ones prefixed by >>):

>> kernel/rcu/srcutree.c:647:1: error: use of undeclared identifier 'u'
   u);
   ^
   1 error generated.


vim +/u +647 kernel/rcu/srcutree.c

   628	
   629	/*
   630	 * Check for consistent NMI safety.
   631	 */
   632	static void srcu_check_nmi_safety(struct srcu_struct *ssp, bool nmi_safe)
   633	{
   634		int nmi_safe_mask = 1 << nmi_safe;
   635		int old_nmi_safe_mask;
   636		struct srcu_data *sdp;
   637	
   638		if (!IS_ENABLED(CONFIG_PROVE_RCU))
   639			return;
   640		sdp = raw_cpu_ptr(ssp->sda);
   641		old_nmi_safe_mask = READ_ONCE(sdp->srcu_nmi_safety);
   642		if (!old_nmi_safe_mask) {
   643			WRITE_ONCE(sdp->srcu_nmi_safety, nmi_safe_mask);
   644			return;
   645		}
   646		WARN_ONCE(old_nmi_safe_mask != nmi_safe_mask, "CPU %d old state %d new state %d\n", sdp->cpu, old_nmi_safe_mask, nmi_safe_mask);
 > 647	u);
   648	}
   649	

-- 
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https://01.org/lkp