[rcu:dev.2016.05.17a 42/45] include/linux/irqflags.h:79:3: error: implicit declaration of function 'arch_irqs_disabled_flags'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2016.05.17a
head:   ac3c30e8911d244986e3bb2c56f7d3ca84405d98
commit: 31862f2d44ddc7144a12656cf2a9ec60c5d200df [42/45] rcu: Make call_rcu_tasks() tolerate first call with irqs disabled
config: um-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        git checkout 31862f2d44ddc7144a12656cf2a9ec60c5d200df
        # save the attached .config to linux build tree
        make ARCH=um 

Note: the rcu/dev.2016.05.17a HEAD ac3c30e8911d244986e3bb2c56f7d3ca84405d98 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   kernel/rcu/update.c:828:13: sparse: incorrect type in argument 1 (different modifiers)
   kernel/rcu/update.c:828:13:    expected int ( *threadfn )( ... )
   kernel/rcu/update.c:828:13:    got int ( static [toplevel] [noreturn] *<noident> )( ... )
   kernel/rcu/update.c:572:28: sparse: undefined identifier 'arch_irqs_disabled_flags'
   In file included from include/linux/spinlock.h:53:0,
                    from kernel/rcu/update.c:36:
   kernel/rcu/update.c: In function 'call_rcu_tasks':
>> include/linux/irqflags.h:79:3: error: implicit declaration of function 'arch_irqs_disabled_flags' [-Werror=implicit-function-declaration]
      arch_irqs_disabled_flags(flags); \
      ^
   include/linux/irqflags.h:149:36: note: in expansion of macro 'raw_irqs_disabled_flags'
    #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
                                       ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/rcu/update.c:572:21: note: in expansion of macro 'irqs_disabled_flags'
         (!havetask && !irqs_disabled_flags(flags))) {
                        ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/arch_irqs_disabled_flags +79 include/linux/irqflags.h

df9ee292 David Howells 2010-10-07  73  		typecheck(unsigned long, flags);	\
df9ee292 David Howells 2010-10-07  74  		flags = arch_local_save_flags();	\
df9ee292 David Howells 2010-10-07  75  	} while (0)
df9ee292 David Howells 2010-10-07  76  #define raw_irqs_disabled_flags(flags)			\
df9ee292 David Howells 2010-10-07  77  	({						\
df9ee292 David Howells 2010-10-07  78  		typecheck(unsigned long, flags);	\
df9ee292 David Howells 2010-10-07 @79  		arch_irqs_disabled_flags(flags);	\
df9ee292 David Howells 2010-10-07  80  	})
df9ee292 David Howells 2010-10-07  81  #define raw_irqs_disabled()		(arch_irqs_disabled())
df9ee292 David Howells 2010-10-07  82  #define raw_safe_halt()			arch_safe_halt()

:::::: The code at line 79 was first introduced by commit
:::::: df9ee29270c11dba7d0fe0b83ce47a4d8e8d2101 Fix IRQ flag handling naming

:::::: TO: David Howells <dhowells@xxxxxxxxxx>
:::::: CC: David Howells <dhowells@xxxxxxxxxx>

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