Hi Cyrill,

FYI, there are new sparse warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm
head:   dad0019944369f58c193c1991c39ffda7ff584d2
commit: c9eeef146c554f8ddcdf5916fb93621f0579e2f8 [26/413] prctl: use access_ok() instead of TASK_SIZE in prctl_set_mm()

  kernel/sys.c:1048:38: sparse: incorrect type in argument 2 (different modifiers)
  kernel/sys.c:1048:38:    expected unsigned long [nocast] [usertype] *ut
  kernel/sys.c:1048:38:    got unsigned long *<noident>
  kernel/sys.c:1048:38: sparse: implicit cast to nocast type
  kernel/sys.c:1048:48: sparse: incorrect type in argument 3 (different modifiers)
  kernel/sys.c:1048:48:    expected unsigned long [nocast] [usertype] *st
  kernel/sys.c:1048:48:    got unsigned long *<noident>
  kernel/sys.c:1048:48: sparse: implicit cast to nocast type
  kernel/sys.c:1112:32: sparse: incorrect type in argument 1 (different address spaces)
  kernel/sys.c:1112:32:    expected struct task_struct *p1
  kernel/sys.c:1112:32:    got struct task_struct [noderef] <asn:4>*real_parent
  kernel/sys.c:1701:25: sparse: implicit cast to nocast type
  kernel/sys.c:1704:38: sparse: incorrect type in argument 2 (different modifiers)
  kernel/sys.c:1704:38:    expected unsigned long [nocast] [usertype] *ut
  kernel/sys.c:1704:38:    got unsigned long *<noident>
  kernel/sys.c:1704:38: sparse: implicit cast to nocast type
  kernel/sys.c:1704:46: sparse: incorrect type in argument 3 (different modifiers)
  kernel/sys.c:1704:46:    expected unsigned long [nocast] [usertype] *st
  kernel/sys.c:1704:46:    got unsigned long *<noident>
  kernel/sys.c:1704:46: sparse: implicit cast to nocast type
  kernel/sys.c:1730:48: sparse: incorrect type in argument 2 (different modifiers)
  kernel/sys.c:1730:48:    expected unsigned long [nocast] [usertype] *ut
  kernel/sys.c:1730:48:    got unsigned long *<noident>
  kernel/sys.c:1730:48: sparse: implicit cast to nocast type
  kernel/sys.c:1730:58: sparse: incorrect type in argument 3 (different modifiers)
  kernel/sys.c:1730:58:    expected unsigned long [nocast] [usertype] *st
  kernel/sys.c:1730:58:    got unsigned long *<noident>
  kernel/sys.c:1730:58: sparse: implicit cast to nocast type
+ kernel/sys.c:1868:14: sparse: incorrect type in argument 1 (different base types)
  kernel/sys.c:1868:14:    expected void const volatile [noderef] <asn:1>*<noident>
  kernel/sys.c:1868:14:    got unsigned long [unsigned] addr
  kernel/sys.c:1984:16: sparse: incorrect type in argument 1 (different address spaces)
  kernel/sys.c:1984:16:    expected void const volatile [noderef] <asn:1>*<noident>
  kernel/sys.c:1984:16:    got int [noderef] <asn:1>**tid_addr

vim +1868 kernel/sys.c
  1852				unsigned long arg4, unsigned long arg5)
  1853	{
  1854		unsigned long rlim = rlimit(RLIMIT_DATA);
  1855		struct mm_struct *mm = current->mm;
  1856		struct vm_area_struct *vma;
  1857		int error;
  1858	
  1859		if (arg5 || (arg4 && opt != PR_SET_MM_AUXV))
  1860			return -EINVAL;
  1861	
  1862		if (!capable(CAP_SYS_RESOURCE))
  1863			return -EPERM;
  1864	
  1865		if (opt == PR_SET_MM_EXE_FILE)
  1866			return prctl_set_mm_exe_file(mm, (unsigned int)addr);
  1867	
> 1868		if (!access_ok(VERIFY_READ, addr, sizeof(addr)) || addr < mmap_min_addr)
  1869			return -EINVAL;
  1870	
  1871		error = -EINVAL;
  1872	
  1873		down_read(&mm->mmap_sem);
  1874		vma = find_vma(mm, addr);
  1875	
  1876		switch (opt) {

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0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu, Yuanhan Liu                              Intel Corporation