Hi Ian,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   96080f697786e0a30006fcbcc5b53f350fcb3e9f
commit: c7acec713d14c6ce8a20154f9dfda258d6bcad3b kernel.h: handle pointers to arrays better in container_of()
date:   10 days ago
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 c7acec713d14c6ce8a20154f9dfda258d6bcad3b
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   In file included from drivers/clocksource/timer-of.c:25:0:
   drivers/clocksource/timer-of.h:35:28: error: field 'clkevt' has incomplete type
     struct clock_event_device clkevt;
                               ^~~~~~
   In file included from include/linux/err.h:4:0,
                    from include/linux/clk.h:15,
                    from drivers/clocksource/timer-of.c:18:
   drivers/clocksource/timer-of.h: In function 'to_timer_of':
>> include/linux/kernel.h:860:32: error: dereferencing pointer to incomplete type 'struct clock_event_device'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
                                   ^~~~~~
   include/linux/compiler.h:517:19: note: in definition of macro '__compiletime_assert'
      bool __cond = !(condition);    \
                      ^~~~~~~~~
   include/linux/compiler.h:537:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:46:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/kernel.h:860:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
     ^~~~~~~~~~~~~~~~
   include/linux/kernel.h:860:20: note: in expansion of macro '__same_type'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
                       ^~~~~~~~~~~
   drivers/clocksource/timer-of.h:44:9: note: in expansion of macro 'container_of'
     return container_of(clkevt, struct timer_of, clkevt);
            ^~~~~~~~~~~~
--
   In file included from drivers//clocksource/timer-of.c:25:0:
   drivers//clocksource/timer-of.h:35:28: error: field 'clkevt' has incomplete type
     struct clock_event_device clkevt;
                               ^~~~~~
   In file included from include/linux/err.h:4:0,
                    from include/linux/clk.h:15,
                    from drivers//clocksource/timer-of.c:18:
   drivers//clocksource/timer-of.h: In function 'to_timer_of':
>> include/linux/kernel.h:860:32: error: dereferencing pointer to incomplete type 'struct clock_event_device'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
                                   ^~~~~~
   include/linux/compiler.h:517:19: note: in definition of macro '__compiletime_assert'
      bool __cond = !(condition);    \
                      ^~~~~~~~~
   include/linux/compiler.h:537:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:46:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/kernel.h:860:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
     ^~~~~~~~~~~~~~~~
   include/linux/kernel.h:860:20: note: in expansion of macro '__same_type'
     BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
                       ^~~~~~~~~~~
   drivers//clocksource/timer-of.h:44:9: note: in expansion of macro 'container_of'
     return container_of(clkevt, struct timer_of, clkevt);
            ^~~~~~~~~~~~

vim +860 include/linux/kernel.h

   843	
   844	
   845	/*
   846	 * swap - swap value of @a and @b
   847	 */
   848	#define swap(a, b) \
   849		do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
   850	
   851	/**
   852	 * container_of - cast a member of a structure out to the containing structure
   853	 * @ptr:	the pointer to the member.
   854	 * @type:	the type of the container struct this is embedded in.
   855	 * @member:	the name of the member within the struct.
   856	 *
   857	 */
   858	#define container_of(ptr, type, member) ({				\
   859		void *__mptr = (void *)(ptr);					\
 > 860		BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) &&	\
   861				 !__same_type(*(ptr), void),			\
   862				 "pointer type mismatch in container_of()");	\
   863		((type *)(__mptr - offsetof(type, member))); })
   864	

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