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From:   "Xia, Hui" <hui.xia@intel.com>
To:     lkp <lkp@intel.com>, Leo Yan <leo.yan@linaro.org>
CC:     "kbuild-all@lists.01.org" <kbuild-all@lists.01.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
        Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Subject: RE: [kbuild-all] include/asm-generic/qspinlock.h:94:9: sparse:
 sparse: context imbalance in '__msm_console_write' - unexpected unlock
Thread-Topic: [kbuild-all] include/asm-generic/qspinlock.h:94:9: sparse:
 sparse: context imbalance in '__msm_console_write' - unexpected unlock
Thread-Index: AQHWgPxXATgBMtE3wEKmaNzqApG5ZalU+9aQ
Date:   Wed, 2 Sep 2020 08:02:45 +0000
Message-ID: <MWHPR11MB161334AE3CC0D7801CE544DFE52F0@MWHPR11MB1613.namprd11.prod.outlook.com>
References: <202009021509.cZc8g2w8%lkp@intel.com>
In-Reply-To: <202009021509.cZc8g2w8%lkp@intel.com>
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Please kindly ignore this mail. It is duplicated.
Sorry for noise.

Best Regards,
Hui

>-----Original Message-----
>From: kernel test robot <lkp@intel.com>
>Sent: 2020=1B$BG/=1B(B9=1B$B7n=1B(B2=1B$BF|=1B(B 15:39
>To: Leo Yan <leo.yan@linaro.org>
>Cc: kbuild-all@lists.01.org; linux-kernel@vger.kernel.org; Greg Kroah-Hart=
man
><gregkh@linuxfoundation.org>; Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
>Subject: [kbuild-all] include/asm-generic/qspinlock.h:94:9: sparse: sparse=
: context
>imbalance in '__msm_console_write' - unexpected unlock
>
>tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git=
 master
>head:   9c7d619be5a002ea29c172df5e3c1227c22cbb41
>commit: 0e4f7f920a5c6bfe5e851e989f27b35a0cc7fb7e tty: serial: msm_serial:
>Fix lockup for sysrq and oops
>date:   9 months ago
>config: arm64-randconfig-s031-20200829 (attached as .config)
>compiler: aarch64-linux-gcc (GCC) 9.3.0
>reproduce:
>        wget https://raw.githubusercontent.com/intel/lkp-
>tests/master/sbin/make.cross -O ~/bin/make.cross
>        chmod +x ~/bin/make.cross
>        # apt-get install sparse
>        # sparse version: v0.6.2-191-g10164920-dirty
>        git checkout 0e4f7f920a5c6bfe5e851e989f27b35a0cc7fb7e
>        # save the attached .config to linux build tree
>        COMPILER_INSTALL_PATH=3D$HOME/0day COMPILER=3Dgcc-9.3.0 make.cross
>C=3D1 CF=3D'-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=3Darm64
>
>If you fix the issue, kindly add following tag as appropriate
>Reported-by: kernel test robot <lkp@intel.com>
>
>
>sparse warnings: (new ones prefixed by >>)
>
>   drivers/tty/serial/msm_serial.c:736:25: sparse: sparse: context imbalan=
ce in
>'msm_handle_rx_dm' - unexpected unlock
>   drivers/tty/serial/msm_serial.c:802:28: sparse: sparse: context imbalan=
ce in
>'msm_handle_rx' - unexpected unlock
>   drivers/tty/serial/msm_serial.c:1100:12: sparse: sparse: context imbala=
nce in
>'msm_set_baud_rate' - unexpected unlock
>   drivers/tty/serial/msm_serial.c: note: in included file (through
>arch/arm64/include/generated/asm/qspinlock.h,
>arch/arm64/include/asm/spinlock.h, include/linux/spinlock.h, ...):
>>> include/asm-generic/qspinlock.h:94:9: sparse: sparse: context
>>> imbalance in '__msm_console_write' - unexpected unlock
>
>#
>https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/=
?id=3D0e
>4f7f920a5c6bfe5e851e989f27b35a0cc7fb7e
>git remote add linus
>https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>git fetch --no-tags linus master
>git checkout 0e4f7f920a5c6bfe5e851e989f27b35a0cc7fb7e
>vim +/__msm_console_write +94 include/asm-generic/qspinlock.h
>
>a33fda35e3a765 Waiman Long 2015-04-24  83
>a33fda35e3a765 Waiman Long 2015-04-24  84  #ifndef queued_spin_unlock
>a33fda35e3a765 Waiman Long 2015-04-24  85  /**
>a33fda35e3a765 Waiman Long 2015-04-24  86   * queued_spin_unlock - release=
 a
>queued spinlock
>a33fda35e3a765 Waiman Long 2015-04-24  87   * @lock : Pointer to queued
>spinlock structure
>a33fda35e3a765 Waiman Long 2015-04-24  88   */
>a33fda35e3a765 Waiman Long 2015-04-24  89  static __always_inline void
>queued_spin_unlock(struct qspinlock *lock)
>a33fda35e3a765 Waiman Long 2015-04-24  90  {
>a33fda35e3a765 Waiman Long 2015-04-24  91  	/*
>ca50e426f96c90 Pan Xinhui  2016-06-03  92  	 * unlock() needs release
>semantics:
>a33fda35e3a765 Waiman Long 2015-04-24  93  	 */
>626e5fbc143589 Will Deacon 2018-04-26 @94  	smp_store_release(&lock-
>>locked, 0);
>a33fda35e3a765 Waiman Long 2015-04-24  95  }
>a33fda35e3a765 Waiman Long 2015-04-24  96  #endif
>a33fda35e3a765 Waiman Long 2015-04-24  97
>
>:::::: The code at line 94 was first introduced by commit
>:::::: 626e5fbc14358901ddaa90ce510e0fbeab310432 locking/qspinlock: Use
>smp_store_release() in queued_spin_unlock()
>
>:::::: TO: Will Deacon <will.deacon@arm.com>
>:::::: CC: Ingo Molnar <mingo@kernel.org>
>
>---
>0-DAY CI Kernel Test Service, Intel Corporation
>https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org