Re: include/linux/kernel.h:860:32: error: dereferencing pointer to incomplete type 'struct clock_event_device'

[Ian Abbott <abbotti@mev.co.uk>]

On 16/07/17 14:50, Ian Abbott wrote:
> On 16/07/17 04:24, kbuild test robot wrote:
>> tree:   
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   5771a8c08880cdca3bfb4a3fc6d309d6bba20877
>> commit: c7acec713d14c6ce8a20154f9dfda258d6bcad3b kernel.h: handle 
>> pointers to arrays better in container_of()
>> date:   3 days ago
>> config: ia64-allyesconfig (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
>>
>> ---
>> 0-DAY kernel test infrastructure                Open Source Technology 
>> Center
>> https://lists.01.org/pipermail/kbuild-all                   Intel 
>> Corporation
>>
> 
> struct clock_event_device is only completely defined when 
> CONFIG_GENERIC_CLOCKEVENTS is defined, which it isn't.  But I'm confused 
> as to why TIMER_OF getting selected by allyesconfig since it depends on 
> GENERIC_CLOCKEVENTS.
> 

It seems to be due to CLKSRC_PISTACHIO being selected,  I guess that 
should also depend on GENERIC_CLOCKEVENTS.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@mev.co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-

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