[rcu:rcu/next 75/114] include/linux/rcu_segcblist.h:70:2: error: unknown type name 'u8'

[kbuild test robot <lkp@intel.com>]

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tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   9b319ecdbf1658a6a1df7f92fc9a71aff7a0a86c
commit: e084617762b7aafb94eebcf13242e8ea16623483 [75/114] rcu/nocb: Use separate flag to indicate disabled ->cblist
config: x86_64-randconfig-a003-201932 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        git checkout e084617762b7aafb94eebcf13242e8ea16623483
        # 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@intel.com>

All errors (new ones prefixed by >>):

   In file included from <command-line>:0:0:
>> include/linux/rcu_segcblist.h:70:2: error: unknown type name 'u8'
     u8 enabled;
     ^~

vim +/u8 +70 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		long len;
    69		long len_lazy;
  > 70		u8 enabled;
    71	};
    72	

---
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