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

[Paul E. McKenney]

On Fri, May 05, 2017 at 04:12:31AM +0800, kbuild test robot wrote:
> 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 >>):

I guess that rcupdate.h needs irqflags.h after all...  Fixing.

							Thanx, Paul

>    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@xxxxxxxxx>
> :::::: CC: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> 
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