linux-kernel - Re: [PATCH 3/3] MIPS: VDSO: Add implementations of gettimeofday() and clock

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Message-ID: <201509282144.v7N80DGC%fengguang.wu@intel.com>
Date:	Mon, 28 Sep 2015 21:15:08 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Markos Chandras <markos.chandras@...tec.com>
Cc:	kbuild-all@...org, linux-mips@...ux-mips.org,
	alex@...x-smith.me.uk, Alex Smith <alex.smith@...tec.com>,
	linux-kernel@...r.kernel.org,
	Markos Chandras <markos.chandras@...tec.com>
Subject: Re: [PATCH 3/3] MIPS: VDSO: Add implementations of gettimeofday()
 and clock_gettime()

Hi Alex,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]

config: mips-allyesconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 0253e397c40cca438922d8ee26cf716a29b1cd77
  # save the attached .config to linux build tree
  make.cross ARCH=mips 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/srcu.h:34:0,
                    from include/linux/notifier.h:15,
                    from arch/mips/include/asm/uprobes.h:9,
                    from include/linux/uprobes.h:61,
                    from include/linux/mm_types.h:13,
                    from arch/mips/include/asm/vdso.h:14,
                    from arch/mips/vdso/vdso.h:25,
                    from arch/mips/vdso/gettimeofday.c:11:
   include/linux/workqueue.h: In function 'work_static':
>> include/linux/workqueue.h:186:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
     return *work_data_bits(work) & WORK_STRUCT_STATIC;
     ^
   cc1: all warnings being treated as errors

vim +186 include/linux/workqueue.h

dd6414b5 Phil Carmody    2010-10-20  170  
65f27f38 David Howells   2006-11-22  171  #define DECLARE_WORK(n, f)						\
65f27f38 David Howells   2006-11-22  172  	struct work_struct n = __WORK_INITIALIZER(n, f)
65f27f38 David Howells   2006-11-22  173  
65f27f38 David Howells   2006-11-22  174  #define DECLARE_DELAYED_WORK(n, f)					\
f991b318 Tejun Heo       2012-08-21  175  	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
65f27f38 David Howells   2006-11-22  176  
203b42f7 Tejun Heo       2012-08-21  177  #define DECLARE_DEFERRABLE_WORK(n, f)					\
f991b318 Tejun Heo       2012-08-21  178  	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
dd6414b5 Phil Carmody    2010-10-20  179  
dc186ad7 Thomas Gleixner 2009-11-16  180  #ifdef CONFIG_DEBUG_OBJECTS_WORK
dc186ad7 Thomas Gleixner 2009-11-16  181  extern void __init_work(struct work_struct *work, int onstack);
dc186ad7 Thomas Gleixner 2009-11-16  182  extern void destroy_work_on_stack(struct work_struct *work);
ea2e64f2 Thomas Gleixner 2014-03-23  183  extern void destroy_delayed_work_on_stack(struct delayed_work *work);
4690c4ab Tejun Heo       2010-06-29  184  static inline unsigned int work_static(struct work_struct *work)
4690c4ab Tejun Heo       2010-06-29  185  {
22df02bb Tejun Heo       2010-06-29 @186  	return *work_data_bits(work) & WORK_STRUCT_STATIC;
4690c4ab Tejun Heo       2010-06-29  187  }
dc186ad7 Thomas Gleixner 2009-11-16  188  #else
dc186ad7 Thomas Gleixner 2009-11-16  189  static inline void __init_work(struct work_struct *work, int onstack) { }
dc186ad7 Thomas Gleixner 2009-11-16  190  static inline void destroy_work_on_stack(struct work_struct *work) { }
ea2e64f2 Thomas Gleixner 2014-03-23  191  static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
4690c4ab Tejun Heo       2010-06-29  192  static inline unsigned int work_static(struct work_struct *work) { return 0; }
dc186ad7 Thomas Gleixner 2009-11-16  193  #endif
dc186ad7 Thomas Gleixner 2009-11-16  194  

:::::: The code at line 186 was first introduced by commit
:::::: 22df02bb3fab24af97bff4c69cc6fd8529fc66fe workqueue: define masks for work flags and conditionalize STATIC flags

:::::: TO: Tejun Heo <tj@...nel.org>
:::::: CC: Tejun Heo <tj@...nel.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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