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Date:   Thu, 14 Jul 2022 21:14:53 +0800
From:   kernel test robot <lkp@intel.com>
To:     Nicholas Piggin <npiggin@gmail.com>
Cc:     kbuild-all@lists.01.org, Nicholas Piggin <npiggin@gmail.com>,
        Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
        Waiman Long <longman@redhat.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        "linux-kernel @ vger . kernel . org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 07/12] locking/qspinlock: remove arch
 qspinlock_paravirt.h includes
Message-ID: <202207142142.cpBOsrfO-lkp@intel.com>
References: <20220713070704.308394-8-npiggin@gmail.com>
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In-Reply-To: <20220713070704.308394-8-npiggin@gmail.com>
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Hi Nicholas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tip/locking/core]
[also build test WARNING on tip/x86/core powerpc/next linus/master v5.19-rc6 next-20220714]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nicholas-Piggin/locking-qspinlock-simplify-code-generation/20220713-151009
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git eae6d58d67d9739be5f7ae2dbead1d0ef6528243
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220714/202207142142.cpBOsrfO-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/87679eeea9f1939c252d16df3ac6a01bf9daaa60
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nicholas-Piggin/locking-qspinlock-simplify-code-generation/20220713-151009
        git checkout 87679eeea9f1939c252d16df3ac6a01bf9daaa60
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/locking/

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

All warnings (new ones prefixed by >>):

   In file included from kernel/locking/qspinlock.c:29:
   kernel/locking/qspinlock_stat.h:36:9: warning: no previous prototype for 'lockevent_read' [-Wmissing-prototypes]
      36 | ssize_t lockevent_read(struct file *file, char __user *user_buf,
         |         ^~~~~~~~~~~~~~
   kernel/locking/qspinlock.c:705:1: warning: no previous prototype for '__pv_queued_spin_unlock_slowpath' [-Wmissing-prototypes]
     705 | __pv_queued_spin_unlock_slowpath(struct qspinlock *lock, u8 locked)
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/locking/qspinlock.c:749:16: warning: no previous prototype for '__pv_queued_spin_unlock' [-Wmissing-prototypes]
     749 | __visible void __pv_queued_spin_unlock(struct qspinlock *lock)
         |                ^~~~~~~~~~~~~~~~~~~~~~~


vim +/__pv_queued_spin_unlock +749 kernel/locking/qspinlock.c

91668ee1ed703d Nicholas Piggin 2022-07-13  747  
91668ee1ed703d Nicholas Piggin 2022-07-13  748  #ifndef __pv_queued_spin_unlock
91668ee1ed703d Nicholas Piggin 2022-07-13 @749  __visible void __pv_queued_spin_unlock(struct qspinlock *lock)
91668ee1ed703d Nicholas Piggin 2022-07-13  750  {
91668ee1ed703d Nicholas Piggin 2022-07-13  751  	u8 locked;
91668ee1ed703d Nicholas Piggin 2022-07-13  752  
91668ee1ed703d Nicholas Piggin 2022-07-13  753  	/*
91668ee1ed703d Nicholas Piggin 2022-07-13  754  	 * We must not unlock if SLOW, because in that case we must first
91668ee1ed703d Nicholas Piggin 2022-07-13  755  	 * unhash. Otherwise it would be possible to have multiple @lock
91668ee1ed703d Nicholas Piggin 2022-07-13  756  	 * entries, which would be BAD.
91668ee1ed703d Nicholas Piggin 2022-07-13  757  	 */
91668ee1ed703d Nicholas Piggin 2022-07-13  758  	locked = cmpxchg_release(&lock->locked, _Q_LOCKED_VAL, 0);
91668ee1ed703d Nicholas Piggin 2022-07-13  759  	if (likely(locked == _Q_LOCKED_VAL))
91668ee1ed703d Nicholas Piggin 2022-07-13  760  		return;
91668ee1ed703d Nicholas Piggin 2022-07-13  761  
91668ee1ed703d Nicholas Piggin 2022-07-13  762  	__pv_queued_spin_unlock_slowpath(lock, locked);
91668ee1ed703d Nicholas Piggin 2022-07-13  763  }
87679eeea9f193 Nicholas Piggin 2022-07-13  764  EXPORT_SYMBOL(__pv_queued_spin_unlock);
91668ee1ed703d Nicholas Piggin 2022-07-13  765  #endif
91668ee1ed703d Nicholas Piggin 2022-07-13  766  

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