linux-kernel - [rcu:rcu/next 33/42] include/linux/rcu_segcblist.h:69:2: error: unknown type name 'atomic_long

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Date:   Sun, 11 Aug 2019 14:57:15 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/next 33/42] include/linux/rcu_segcblist.h:69:2: error:
 unknown type name 'atomic_long_t'

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   9b319ecdbf1658a6a1df7f92fc9a71aff7a0a86c
commit: 9f3ca094510499050dbd8cd58677f6fd70b5aa60 [33/42] rcu/nocb: Atomic ->len field in rcu_segcblist structure
config: x86_64-randconfig-a003-201932 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        git checkout 9f3ca094510499050dbd8cd58677f6fd70b5aa60
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   In file included from <command-line>:0:0:
>> include/linux/rcu_segcblist.h:69:2: error: unknown type name 'atomic_long_t'
     atomic_long_t len;
     ^~~~~~~~~~~~~
   include/linux/rcu_segcblist.h:74:2: error: unknown type name 'u8'
     u8 enabled;
     ^~
   include/linux/rcu_segcblist.h:75:2: error: unknown type name 'u8'
     u8 offloaded;
     ^~

vim +/atomic_long_t +69 include/linux/rcu_segcblist.h

    63	
    64	struct rcu_segcblist {
    65		struct rcu_head *head;
    66		struct rcu_head **tails[RCU_CBLIST_NSEGS];
    67		unsigned long gp_seq[RCU_CBLIST_NSEGS];
    68	#ifdef CONFIG_RCU_NOCB_CPU
  > 69		atomic_long_t len;
    70	#else
    71		long len;
    72	#endif
    73		long len_lazy;
    74		u8 enabled;
    75		u8 offloaded;
    76	};
    77	

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