Re: [PATCH 1/7] Apply transparent_union attribute to union semun

[kbuild test robot <lkp@intel.com>]

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Hi Jonas,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.8-rc6 next-20160916]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Stafford-Horne/openrisc-Misc-fixes-from-backlog/20160916-230114
config: x86_64-randconfig-x011-09161116 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/sem.h:7:0,
                    from include/linux/sched.h:35,
                    from include/linux/utsname.h:5,
                    from init/version.c:12:
>> include/uapi/linux/sem.h:45:7: warning: union cannot be made transparent
    union semun {
          ^~~~~
--
   In file included from include/linux/sem.h:7:0,
                    from include/linux/sched.h:35,
                    from include/linux/kasan.h:4,
                    from kernel/sched/core.c:29:
>> include/uapi/linux/sem.h:45:7: warning: union cannot be made transparent
    union semun {
          ^~~~~
   In file included from include/linux/perf_event.h:47:0,
                    from kernel/sched/core.c:42:
   include/linux/ftrace.h: In function 'preempt_schedule_common':
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:710:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:723:9: note: in expansion of macro 'CALLER_ADDR1'
     addr = CALLER_ADDR1;
            ^~~~~~~~~~~~
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:711:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:726:9: note: in expansion of macro 'CALLER_ADDR2'
     return CALLER_ADDR2;
            ^~~~~~~~~~~~
   include/linux/ftrace.h: In function 'preempt_count_add':
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:710:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:723:9: note: in expansion of macro 'CALLER_ADDR1'
     addr = CALLER_ADDR1;
            ^~~~~~~~~~~~
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:711:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:726:9: note: in expansion of macro 'CALLER_ADDR2'
     return CALLER_ADDR2;
            ^~~~~~~~~~~~
   include/linux/ftrace.h: In function 'preempt_schedule_notrace':
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:710:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:723:9: note: in expansion of macro 'CALLER_ADDR1'
     addr = CALLER_ADDR1;
            ^~~~~~~~~~~~
   include/linux/ftrace.h:703:36: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address]
    #  define ftrace_return_address(n) __builtin_return_address(n)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:711:38: note: in expansion of macro 'ftrace_return_address'
    #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
                                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/ftrace.h:726:9: note: in expansion of macro 'CALLER_ADDR2'
     return CALLER_ADDR2;
            ^~~~~~~~~~~~

vim +45 include/uapi/linux/sem.h

607ca46e David Howells 2012-10-13  29  	struct sem_queue **sem_pending_last;	/* last pending operation */
607ca46e David Howells 2012-10-13  30  	struct sem_undo	*undo;			/* undo requests on this array */
607ca46e David Howells 2012-10-13  31  	unsigned short	sem_nsems;		/* no. of semaphores in array */
607ca46e David Howells 2012-10-13  32  };
607ca46e David Howells 2012-10-13  33  
607ca46e David Howells 2012-10-13  34  /* Include the definition of semid64_ds */
607ca46e David Howells 2012-10-13  35  #include <asm/sembuf.h>
607ca46e David Howells 2012-10-13  36  
607ca46e David Howells 2012-10-13  37  /* semop system calls takes an array of these. */
607ca46e David Howells 2012-10-13  38  struct sembuf {
607ca46e David Howells 2012-10-13  39  	unsigned short  sem_num;	/* semaphore index in array */
607ca46e David Howells 2012-10-13  40  	short		sem_op;		/* semaphore operation */
607ca46e David Howells 2012-10-13  41  	short		sem_flg;	/* operation flags */
607ca46e David Howells 2012-10-13  42  };
607ca46e David Howells 2012-10-13  43  
607ca46e David Howells 2012-10-13  44  /* arg for semctl system calls. */
607ca46e David Howells 2012-10-13 @45  union semun {
607ca46e David Howells 2012-10-13  46  	int val;			/* value for SETVAL */
607ca46e David Howells 2012-10-13  47  	struct semid_ds __user *buf;	/* buffer for IPC_STAT & IPC_SET */
607ca46e David Howells 2012-10-13  48  	unsigned short __user *array;	/* array for GETALL & SETALL */
607ca46e David Howells 2012-10-13  49  	struct seminfo __user *__buf;	/* buffer for IPC_INFO */
607ca46e David Howells 2012-10-13  50  	void __user *__pad;
46f40460 Jonas Bonn    2016-09-16  51  } __attribute__ ((transparent_union));
607ca46e David Howells 2012-10-13  52  
607ca46e David Howells 2012-10-13  53  struct  seminfo {

:::::: The code at line 45 was first introduced by commit
:::::: 607ca46e97a1b6594b29647d98a32d545c24bdff UAPI: (Scripted) Disintegrate include/linux

:::::: TO: David Howells <dhowells@redhat.com>
:::::: CC: David Howells <dhowells@redhat.com>

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