[luto:sched/lazymm 10/14] fs/exec.c:981:2: error: implicit declaration of function 'exec_mm_release'; did you mean 'exit_mm_release'?

[luto:sched/lazymm 10/14] fs/exec.c:981:2: error: implicit declaration of function 'exec_mm_release'; did you mean 'exit_mm_release'?

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git sched/lazymm
head:   717e171609e72e2f3362c56eab7732cb2e08d2f7
commit: 3a2b0d850d08b87040853ff26b46da9ac798f378 [10/14] membarrier: Fix incorrect barrier position during exec
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id=3a2b0d850d08b87040853ff26b46da9ac798f378
        git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
        git fetch --no-tags luto sched/lazymm
        git checkout 3a2b0d850d08b87040853ff26b46da9ac798f378
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

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

>> kernel/fork.c:1343:6: warning: no previous prototype for 'exec_mm_release' [-Wmissing-prototypes]
    1343 | void exec_mm_release(struct task_struct *tsk, struct mm_struct *mm)
         |      ^~~~~~~~~~~~~~~
--
   fs/exec.c: In function 'exec_mmap':
>> fs/exec.c:981:2: error: implicit declaration of function 'exec_mm_release'; did you mean 'exit_mm_release'? [-Werror=implicit-function-declaration]
     981 |  exec_mm_release(tsk, old_mm);
         |  ^~~~~~~~~~~~~~~
         |  exit_mm_release
   cc1: some warnings being treated as errors


vim +981 fs/exec.c

3dc20cb282ec03 Al Viro           2013-04-13   966  
eea9673250db4e Eric W. Biederman 2020-03-25   967  /*
eea9673250db4e Eric W. Biederman 2020-03-25   968   * Maps the mm_struct mm into the current task struct.
f7cfd871ae0c50 Eric W. Biederman 2020-12-03   969   * On success, this function returns with exec_update_lock
f7cfd871ae0c50 Eric W. Biederman 2020-12-03   970   * held for writing.
eea9673250db4e Eric W. Biederman 2020-03-25   971   */
^1da177e4c3f41 Linus Torvalds    2005-04-16   972  static int exec_mmap(struct mm_struct *mm)
^1da177e4c3f41 Linus Torvalds    2005-04-16   973  {
^1da177e4c3f41 Linus Torvalds    2005-04-16   974  	struct task_struct *tsk;
^1da177e4c3f41 Linus Torvalds    2005-04-16   975  	struct mm_struct *old_mm, *active_mm;
eea9673250db4e Eric W. Biederman 2020-03-25   976  	int ret;
^1da177e4c3f41 Linus Torvalds    2005-04-16   977  
^1da177e4c3f41 Linus Torvalds    2005-04-16   978  	/* Notify parent that we're no longer interested in the old VM */
^1da177e4c3f41 Linus Torvalds    2005-04-16   979  	tsk = current;
^1da177e4c3f41 Linus Torvalds    2005-04-16   980  	old_mm = current->mm;
4610ba7ad877fa Thomas Gleixner   2019-11-06  @981  	exec_mm_release(tsk, old_mm);
a28bf136e651e1 Eric W. Biederman 2020-03-30   982  	if (old_mm)
a28bf136e651e1 Eric W. Biederman 2020-03-30   983  		sync_mm_rss(old_mm);
^1da177e4c3f41 Linus Torvalds    2005-04-16   984  
f7cfd871ae0c50 Eric W. Biederman 2020-12-03   985  	ret = down_write_killable(&tsk->signal->exec_update_lock);
eea9673250db4e Eric W. Biederman 2020-03-25   986  	if (ret)
eea9673250db4e Eric W. Biederman 2020-03-25   987  		return ret;
eea9673250db4e Eric W. Biederman 2020-03-25   988  
^1da177e4c3f41 Linus Torvalds    2005-04-16   989  	if (old_mm) {
^1da177e4c3f41 Linus Torvalds    2005-04-16   990  		/*
^1da177e4c3f41 Linus Torvalds    2005-04-16   991  		 * Make sure that if there is a core dump in progress
^1da177e4c3f41 Linus Torvalds    2005-04-16   992  		 * for the old mm, we get out and die instead of going
c1e8d7c6a7a682 Michel Lespinasse 2020-06-08   993  		 * through with the exec.  We must hold mmap_lock around
999d9fc1670bc0 Oleg Nesterov     2008-07-25   994  		 * checking core_state and changing tsk->mm.
^1da177e4c3f41 Linus Torvalds    2005-04-16   995  		 */
d8ed45c5dcd455 Michel Lespinasse 2020-06-08   996  		mmap_read_lock(old_mm);
999d9fc1670bc0 Oleg Nesterov     2008-07-25   997  		if (unlikely(old_mm->core_state)) {
d8ed45c5dcd455 Michel Lespinasse 2020-06-08   998  			mmap_read_unlock(old_mm);
f7cfd871ae0c50 Eric W. Biederman 2020-12-03   999  			up_write(&tsk->signal->exec_update_lock);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1000  			return -EINTR;
^1da177e4c3f41 Linus Torvalds    2005-04-16  1001  		}
^1da177e4c3f41 Linus Torvalds    2005-04-16  1002  	}
eea9673250db4e Eric W. Biederman 2020-03-25  1003  
^1da177e4c3f41 Linus Torvalds    2005-04-16  1004  	task_lock(tsk);
ab22b43ceabaac Andy Lutomirski   2021-06-22  1005  	__activate_mm(mm);
615d6e8756c871 Davidlohr Bueso   2014-04-07  1006  	tsk->mm->vmacache_seqnum = 0;
615d6e8756c871 Davidlohr Bueso   2014-04-07  1007  	vmacache_flush(tsk);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1008  	task_unlock(tsk);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1009  	if (old_mm) {
d8ed45c5dcd455 Michel Lespinasse 2020-06-08  1010  		mmap_read_unlock(old_mm);
7dddb12c63553d Eric Sesterhenn   2006-04-01  1011  		BUG_ON(active_mm != old_mm);
701085b219016d Oleg Nesterov     2012-03-19  1012  		setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm);
31a78f23bac006 Balbir Singh      2008-09-28  1013  		mm_update_next_owner(old_mm);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1014  		mmput(old_mm);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1015  		return 0;
^1da177e4c3f41 Linus Torvalds    2005-04-16  1016  	}
^1da177e4c3f41 Linus Torvalds    2005-04-16  1017  	mmdrop(active_mm);
^1da177e4c3f41 Linus Torvalds    2005-04-16  1018  	return 0;
^1da177e4c3f41 Linus Torvalds    2005-04-16  1019  }
^1da177e4c3f41 Linus Torvalds    2005-04-16  1020  

:::::: The code at line 981 was first introduced by commit
:::::: 4610ba7ad877fafc0a25a30c6c82015304120426 exit/exec: Seperate mm_release()

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

---
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https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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