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

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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@xxxxxxxxx> )=-
-=(                          Web: http://www.mev.co.uk/  )=-

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