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Date: Sun, 16 Jul 2017 15:14:04 +0100
From: Ian Abbott <abbotti@....co.uk>
To: kbuild test robot <fengguang.wu@...el.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: include/linux/kernel.h:860:32: error: dereferencing pointer to
incomplete type 'struct clock_event_device'
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@....co.uk> )=-
-=( Web: http://www.mev.co.uk/ )=-
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