From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f197.google.com (mail-qk0-f197.google.com [209.85.220.197]) by kanga.kvack.org (Postfix) with ESMTP id 263606B0292 for ; Mon, 24 Jul 2017 06:31:53 -0400 (EDT) Received: by mail-qk0-f197.google.com with SMTP id k14so578183qkl.7 for ; Mon, 24 Jul 2017 03:31:53 -0700 (PDT) Received: from smtp116.iad3a.emailsrvr.com (smtp116.iad3a.emailsrvr.com. [173.203.187.116]) by mx.google.com with ESMTPS id r88si8836601qtd.448.2017.07.24.03.31.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Jul 2017 03:31:52 -0700 (PDT) Subject: Re: include/linux/kernel.h:860:32: error: dereferencing pointer to incomplete type 'struct clock_event_device' References: <201707231211.ieDvuzfs%fengguang.wu@intel.com> From: Ian Abbott Message-ID: <87c98bfa-8a6d-4bc6-65e5-7b65afa072da@mev.co.uk> Date: Mon, 24 Jul 2017 11:31:49 +0100 MIME-Version: 1.0 In-Reply-To: <201707231211.ieDvuzfs%fengguang.wu@intel.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: kbuild test robot Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Andrew Morton , Linux Memory Management List , Matt Redfearn On 23/07/17 05:56, kbuild test robot wrote: > 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 Matt Redfearn sent a fix 6 days ago. It didn't get Cc'ed to LKML, but it did get Cc'd to the CLOCKSOURCE maintainers. Does it need re-posting? -- -=( Ian Abbott @ MEV Ltd. E-mail: )=- -=( Web: http://www.mev.co.uk/ )=- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org