linux-kernel - [rcu:dev.2017.05.04a 89/89] include/linux/rcupdate.h:273:10: note: in expansion of macro 'preemptible'

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Date:   Fri, 5 May 2017 04:12:31 +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:dev.2017.05.04a 89/89] include/linux/rcupdate.h:273:10: note:
 in expansion of macro 'preemptible'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2017.05.04a
head:   f506321acd3999cabe6905e8b3b1cd50c074741d
commit: f506321acd3999cabe6905e8b3b1cd50c074741d [89/89] rcu: Move ktime needs to rcutiny.h and remove ktime.h from rcupdate.h
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout f506321acd3999cabe6905e8b3b1cd50c074741d
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   warning: (FAULT_INJECTION_STACKTRACE_FILTER && LATENCYTOP && KMEMCHECK && LOCKDEP) selects FRAME_POINTER which has unmet direct dependencies (DEBUG_KERNEL && (CRIS || M68K || FRV || UML || AVR32 || SUPERH || BLACKFIN || MN10300 || METAG) || ARCH_WANT_FRAME_POINTERS)
   warning: (FAULT_INJECTION_STACKTRACE_FILTER && LATENCYTOP && KMEMCHECK && LOCKDEP) selects FRAME_POINTER which has unmet direct dependencies (DEBUG_KERNEL && (CRIS || M68K || FRV || UML || AVR32 || SUPERH || BLACKFIN || MN10300 || METAG) || ARCH_WANT_FRAME_POINTERS)
   In file included from include/linux/rcupdate.h:36:0,
                    from include/linux/rculist.h:10,
                    from include/linux/sched/signal.h:4,
                    from arch/ia64/kernel/asm-offsets.c:9:
   include/linux/rcupdate.h: In function 'rcu_read_lock_sched_held':
   include/linux/preempt.h:185:49: error: implicit declaration of function 'irqs_disabled' [-Werror=implicit-function-declaration]
    #define preemptible() (preempt_count() == 0 && !irqs_disabled())
                                                    ^
>> include/linux/rcupdate.h:273:10: note: in expansion of macro 'preemptible'
     return !preemptible();
             ^~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [arch/ia64/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/preemptible +273 include/linux/rcupdate.h

632ee200 Paul E. McKenney 2010-02-22  257  
d8ab29f8 Paul E. McKenney 2011-10-07  258  # define rcu_lock_acquire(a)		do { } while (0)
d8ab29f8 Paul E. McKenney 2011-10-07  259  # define rcu_lock_release(a)		do { } while (0)
632ee200 Paul E. McKenney 2010-02-22  260  
632ee200 Paul E. McKenney 2010-02-22  261  static inline int rcu_read_lock_held(void)
632ee200 Paul E. McKenney 2010-02-22  262  {
632ee200 Paul E. McKenney 2010-02-22  263  	return 1;
632ee200 Paul E. McKenney 2010-02-22  264  }
632ee200 Paul E. McKenney 2010-02-22  265  
632ee200 Paul E. McKenney 2010-02-22  266  static inline int rcu_read_lock_bh_held(void)
632ee200 Paul E. McKenney 2010-02-22  267  {
632ee200 Paul E. McKenney 2010-02-22  268  	return 1;
632ee200 Paul E. McKenney 2010-02-22  269  }
632ee200 Paul E. McKenney 2010-02-22  270  
632ee200 Paul E. McKenney 2010-02-22  271  static inline int rcu_read_lock_sched_held(void)
632ee200 Paul E. McKenney 2010-02-22  272  {
293e2421 Boqun Feng       2016-03-23 @273  	return !preemptible();
632ee200 Paul E. McKenney 2010-02-22  274  }
632ee200 Paul E. McKenney 2010-02-22  275  #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
632ee200 Paul E. McKenney 2010-02-22  276  
632ee200 Paul E. McKenney 2010-02-22  277  #ifdef CONFIG_PROVE_RCU
632ee200 Paul E. McKenney 2010-02-22  278  
4221a991 Tetsuo Handa     2010-06-26  279  /**
f78f5b90 Paul E. McKenney 2015-06-18  280   * RCU_LOCKDEP_WARN - emit lockdep splat if specified condition is met
f78f5b90 Paul E. McKenney 2015-06-18  281   * @c: condition to check

:::::: The code at line 273 was first introduced by commit
:::::: 293e2421fe25839500207eda123cc4475f8d17b8 rcu: Remove superfluous versions of rcu_read_lock_sched_held()

:::::: TO: Boqun Feng <boqun.feng@...il.com>
:::::: CC: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

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