linux-kernel - [tip:locking/urgent 1/1] kernel/futex.c:3276:11: error: 'EMORON' undeclared; did you mean 'ELOOP'?

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Message-ID: <201712282213.gLBeLuDM%fengguang.wu@intel.com>
Date:   Thu, 28 Dec 2017 22:48:16 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:locking/urgent 1/1] kernel/futex.c:3276:11: error: 'EMORON'
 undeclared; did you mean 'ELOOP'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/urgent
head:   8f3365e34f7519904d78d9fb6dd9e4bae606b9b5
commit: 8f3365e34f7519904d78d9fb6dd9e4bae606b9b5 [1/1] futex: Sanitize user address in set_robust_list()
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 8f3365e34f7519904d78d9fb6dd9e4bae606b9b5
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   kernel/futex.c: In function 'SYSC_set_robust_list':
>> kernel/futex.c:3276:11: error: 'EMORON' undeclared (first use in this function); did you mean 'ELOOP'?
      return -EMORON;
              ^~~~~~
              ELOOP
   kernel/futex.c:3276:11: note: each undeclared identifier is reported only once for each function it appears in

vim +3276 kernel/futex.c

  3241	
  3242	/*
  3243	 * Support for robust futexes: the kernel cleans up held futexes at
  3244	 * thread exit time.
  3245	 *
  3246	 * Implementation: user-space maintains a per-thread list of locks it
  3247	 * is holding. Upon do_exit(), the kernel carefully walks this list,
  3248	 * and marks all locks that are owned by this thread with the
  3249	 * FUTEX_OWNER_DIED bit, and wakes up a waiter (if any). The list is
  3250	 * always manipulated with the lock held, so the list is private and
  3251	 * per-thread. Userspace also maintains a per-thread 'list_op_pending'
  3252	 * field, to allow the kernel to clean up if the thread dies after
  3253	 * acquiring the lock, but just before it could have added itself to
  3254	 * the list. There can only be one such pending lock.
  3255	 */
  3256	
  3257	/**
  3258	 * sys_set_robust_list() - Set the robust-futex list head of a task
  3259	 * @head:	pointer to the list-head
  3260	 * @len:	length of the list-head, as userspace expects
  3261	 */
  3262	SYSCALL_DEFINE2(set_robust_list, struct robust_list_head __user *, head,
  3263			size_t, len)
  3264	{
  3265		unsigned long address = (unsigned long)head;
  3266	
  3267		if (!futex_cmpxchg_enabled)
  3268			return -ENOSYS;
  3269		/*
  3270		 * The kernel knows only one size for now:
  3271		 */
  3272		if (unlikely(len != sizeof(*head)))
  3273			return -EINVAL;
  3274	
  3275		if (unlikely(address % __alignof__(*head)))
> 3276			return -EMORON;
  3277	
  3278		current->robust_list = head;
  3279	
  3280		return 0;
  3281	}
  3282	

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