linux-kernel - [rcu:rcu/dev 87/90] arch/alpha/include/asm/irqflags.h:34:2: error: implicit declaration of function 'barrier'

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Date:   Fri, 5 May 2017 07:20:20 +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 87/90] arch/alpha/include/asm/irqflags.h:34:2: error:
 implicit declaration of function 'barrier'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   894c3990aadbe57e0e87f9d18307fa2a4e27af7f
commit: 7683511c453ce2bb1b7d30fde281ecdacca04f6b [87/90] rcu: Move ktime needs to rcutiny.h and remove ktime.h from rcupdate.h
config: alpha-defconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 7683511c453ce2bb1b7d30fde281ecdacca04f6b
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   In file included from include/linux/irqflags.h:15:0,
                    from include/linux/rcupdate.h:36,
                    from include/linux/init_task.h:4,
                    from init/init_task.c:1:
   arch/alpha/include/asm/irqflags.h: In function 'arch_local_irq_disable':
>> arch/alpha/include/asm/irqflags.h:34:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration]
     barrier();
     ^~~~~~~
   arch/alpha/include/asm/irqflags.h: At top level:
>> arch/alpha/include/asm/irqflags.h:57:15: error: unknown type name 'bool'
    static inline bool arch_irqs_disabled_flags(unsigned long flags)
                  ^~~~
   arch/alpha/include/asm/irqflags.h:62:15: error: unknown type name 'bool'
    static inline bool arch_irqs_disabled(void)
                  ^~~~
   cc1: some warnings being treated as errors

vim +/barrier +34 arch/alpha/include/asm/irqflags.h

df9ee292 David Howells 2010-10-07  28  	return rdps();
df9ee292 David Howells 2010-10-07  29  }
df9ee292 David Howells 2010-10-07  30  
df9ee292 David Howells 2010-10-07  31  static inline void arch_local_irq_disable(void)
df9ee292 David Howells 2010-10-07  32  {
df9ee292 David Howells 2010-10-07  33  	setipl(IPL_MAX);
df9ee292 David Howells 2010-10-07 @34  	barrier();
df9ee292 David Howells 2010-10-07  35  }
df9ee292 David Howells 2010-10-07  36  
df9ee292 David Howells 2010-10-07  37  static inline unsigned long arch_local_irq_save(void)
df9ee292 David Howells 2010-10-07  38  {
df9ee292 David Howells 2010-10-07  39  	unsigned long flags = swpipl(IPL_MAX);
df9ee292 David Howells 2010-10-07  40  	barrier();
df9ee292 David Howells 2010-10-07  41  	return flags;
df9ee292 David Howells 2010-10-07  42  }
df9ee292 David Howells 2010-10-07  43  
df9ee292 David Howells 2010-10-07  44  static inline void arch_local_irq_enable(void)
df9ee292 David Howells 2010-10-07  45  {
df9ee292 David Howells 2010-10-07  46  	barrier();
df9ee292 David Howells 2010-10-07  47  	setipl(IPL_MIN);
df9ee292 David Howells 2010-10-07  48  }
df9ee292 David Howells 2010-10-07  49  
df9ee292 David Howells 2010-10-07  50  static inline void arch_local_irq_restore(unsigned long flags)
df9ee292 David Howells 2010-10-07  51  {
df9ee292 David Howells 2010-10-07  52  	barrier();
df9ee292 David Howells 2010-10-07  53  	setipl(flags);
df9ee292 David Howells 2010-10-07  54  	barrier();
df9ee292 David Howells 2010-10-07  55  }
df9ee292 David Howells 2010-10-07  56  
df9ee292 David Howells 2010-10-07 @57  static inline bool arch_irqs_disabled_flags(unsigned long flags)
df9ee292 David Howells 2010-10-07  58  {
df9ee292 David Howells 2010-10-07  59  	return flags == IPL_MAX;
df9ee292 David Howells 2010-10-07  60  }

:::::: The code at line 34 was first introduced by commit
:::::: df9ee29270c11dba7d0fe0b83ce47a4d8e8d2101 Fix IRQ flag handling naming

:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>

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