linux-kernel - [rcu:rcu/dev 31/38] kernel/rcu/rcu_segcblist.h:77:2: error: implicit declaration of function 'prefetch'

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Date:   Sat, 11 Feb 2017 08:37:16 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/dev 31/38] kernel/rcu/rcu_segcblist.h:77:2: error: implicit
 declaration of function 'prefetch'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   1f7c9e1bb76b7dc50e515bd6ce9b3a8526377d17
commit: 0e629d6798567fe31bcf7e16ba5c5affcad15059 [31/38] rcu: Abstract multi-tail callback list handling
config: parisc-allyesconfig (attached as .config)
compiler: hppa-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 0e629d6798567fe31bcf7e16ba5c5affcad15059
        # save the attached .config to linux build tree
        make.cross ARCH=parisc 

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/tree.h:32:0,
                    from kernel/rcu/tree_trace.c:46:
   kernel/rcu/rcu_segcblist.h: In function 'rcu_cblist_dequeue':
>> kernel/rcu/rcu_segcblist.h:77:2: error: implicit declaration of function 'prefetch' [-Werror=implicit-function-declaration]
     prefetch(rhp);
     ^~~~~~~~
   cc1: some warnings being treated as errors

vim +/prefetch +77 kernel/rcu/rcu_segcblist.h

    71	{
    72		struct rcu_head *rhp;
    73	
    74		rhp = rclp->head;
    75		if (!rhp)
    76			return NULL;
  > 77		prefetch(rhp);
    78		rclp->len--;
    79		rclp->head = rhp->next;
    80		if (!rclp->head)

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