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
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