linux-kernel - [rcu:rcu/test 76/76] drivers/dax/super.c:21:1: error: use of undeclared identifier '___srcu_struct

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Date:   Tue, 27 Oct 2020 08:50:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [rcu:rcu/test 76/76] drivers/dax/super.c:21:1: error: use of
 undeclared identifier '___srcu_struct_ptrs'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/test
head:   784a6343c3660446ae62db13628b20e9f876100f
commit: 784a6343c3660446ae62db13628b20e9f876100f [76/76] Merge commit '3650b22' into rcu/test
config: arm-randconfig-r026-20201026 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project f2c25c70791de95d2466e09b5b58fc37f6ccd7a4)
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://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=784a6343c3660446ae62db13628b20e9f876100f
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu rcu/test
        git checkout 784a6343c3660446ae62db13628b20e9f876100f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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 >>):

>> drivers/dax/super.c:21:1: error: use of undeclared identifier '___srcu_struct_ptrs'
   DEFINE_STATIC_SRCU(dax_srcu);
   ^
   include/linux/srcutree.h:135:34: note: expanded from macro 'DEFINE_STATIC_SRCU'
   #define DEFINE_STATIC_SRCU(name)        __DEFINE_SRCU(name, static)
                                           ^
   include/linux/srcutree.h:127:13: note: expanded from macro '__DEFINE_SRCU'
                   __section(___srcu_struct_ptrs) = &name
                             ^
   drivers/dax/super.c:70:6: warning: no previous prototype for function '__generic_fsdax_supported' [-Wmissing-prototypes]
   bool __generic_fsdax_supported(struct dax_device *dax_dev,
        ^
   drivers/dax/super.c:70:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool __generic_fsdax_supported(struct dax_device *dax_dev,
   ^
   static 
   drivers/dax/super.c:168:6: warning: no previous prototype for function '__bdev_dax_supported' [-Wmissing-prototypes]
   bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
        ^
   drivers/dax/super.c:168:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
   ^
   static 
   drivers/dax/super.c:452:6: warning: no previous prototype for function 'run_dax' [-Wmissing-prototypes]
   void run_dax(struct dax_device *dax_dev)
        ^
   drivers/dax/super.c:452:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void run_dax(struct dax_device *dax_dev)
   ^
   static 
   3 warnings and 1 error generated.

vim +/___srcu_struct_ptrs +21 drivers/dax/super.c

7b6be8444e0f0d Dan Williams 2017-04-11  19  
7b6be8444e0f0d Dan Williams 2017-04-11  20  static dev_t dax_devt;
7b6be8444e0f0d Dan Williams 2017-04-11 @21  DEFINE_STATIC_SRCU(dax_srcu);
7b6be8444e0f0d Dan Williams 2017-04-11  22  static struct vfsmount *dax_mnt;
7b6be8444e0f0d Dan Williams 2017-04-11  23  static DEFINE_IDA(dax_minor_ida);
7b6be8444e0f0d Dan Williams 2017-04-11  24  static struct kmem_cache *dax_cache __read_mostly;
7b6be8444e0f0d Dan Williams 2017-04-11  25  static struct super_block *dax_superblock __read_mostly;
7b6be8444e0f0d Dan Williams 2017-04-11  26  

:::::: The code at line 21 was first introduced by commit
:::::: 7b6be8444e0f0dd675b54d059793423d3c9b4c03 dax: refactor dax-fs into a generic provider of 'struct dax_device' instances

:::::: TO: Dan Williams <dan.j.williams@...el.com>
:::::: CC: Dan Williams <dan.j.williams@...el.com>

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

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