Re: [PATCH 01/18] mm: Make mmap_sem for write waits killable for mm syscalls

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

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Hi Michal,

[auto build test WARNING on next-20160229]
[also build test WARNING on v4.5-rc6]
[cannot apply to drm/drm-next drm-intel/for-linux-next v4.5-rc6 v4.5-rc5 v4.5-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/change-mmap_sem-taken-for-write-killable/20160229-213258
config: i386-randconfig-x003-201609 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:4:0,
                    from arch/x86/include/asm/bug.h:35,
                    from include/linux/bug.h:4,
                    from include/linux/mmdebug.h:4,
                    from include/linux/mm.h:8,
                    from mm/util.c:1:
   mm/util.c: In function 'vm_mmap_pgoff':
   mm/util.c:331:8: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
       if (down_write_killable(&mm->mmap_sem))
           ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/util.c:331:4: note: in expansion of macro 'if'
       if (down_write_killable(&mm->mmap_sem))
       ^
   cc1: some warnings being treated as errors
--
   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/uapi/linux/capability.h:16,
                    from include/linux/capability.h:15,
                    from mm/mlock.c:8:
   mm/mlock.c: In function 'do_mlock':
   mm/mlock.c:638:6: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&current->mm->mmap_sem))
         ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/mlock.c:638:2: note: in expansion of macro 'if'
     if (down_write_killable(&current->mm->mmap_sem))
     ^
   cc1: some warnings being treated as errors
--
   In file included from include/linux/linkage.h:4:0,
                    from include/linux/kernel.h:6,
                    from mm/mmap.c:11:
   mm/mmap.c: In function 'SYSC_brk':
   mm/mmap.c:185:6: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&mm->mmap_sem))
         ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/mmap.c:185:2: note: in expansion of macro 'if'
     if (down_write_killable(&mm->mmap_sem))
     ^
   cc1: some warnings being treated as errors
--
   In file included from include/asm-generic/bug.h:4:0,
                    from arch/x86/include/asm/bug.h:35,
                    from include/linux/bug.h:4,
                    from include/linux/mmdebug.h:4,
                    from include/linux/mm.h:8,
                    from mm/mprotect.c:11:
   mm/mprotect.c: In function 'SYSC_mprotect':
   mm/mprotect.c:381:6: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&current->mm->mmap_sem))
         ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/mprotect.c:381:2: note: in expansion of macro 'if'
     if (down_write_killable(&current->mm->mmap_sem))
     ^
   cc1: some warnings being treated as errors
--
   In file included from include/asm-generic/bug.h:4:0,
                    from arch/x86/include/asm/bug.h:35,
                    from include/linux/bug.h:4,
                    from include/linux/mmdebug.h:4,
                    from include/linux/mm.h:8,
                    from mm/mremap.c:10:
   mm/mremap.c: In function 'SYSC_mremap':
   mm/mremap.c:505:6: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&current->mm->mmap_sem))
         ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/mremap.c:505:2: note: in expansion of macro 'if'
     if (down_write_killable(&current->mm->mmap_sem))
     ^
   cc1: some warnings being treated as errors
--
   In file included from include/asm-generic/bug.h:4:0,
                    from arch/x86/include/asm/bug.h:35,
                    from include/linux/bug.h:4,
                    from include/linux/mmdebug.h:4,
                    from include/linux/mm.h:8,
                    from include/linux/mman.h:4,
                    from mm/madvise.c:8:
   mm/madvise.c: In function 'SYSC_madvise':
   mm/madvise.c:768:7: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
      if (down_write_killable(&current->mm->mmap_sem))
          ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> mm/madvise.c:768:3: note: in expansion of macro 'if'
      if (down_write_killable(&current->mm->mmap_sem))
      ^
   cc1: some warnings being treated as errors

vim +/if +331 mm/util.c

   315	{
   316		return get_user_pages_unlocked(start, nr_pages, write, 0, pages);
   317	}
   318	EXPORT_SYMBOL_GPL(get_user_pages_fast);
   319	
   320	unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
   321		unsigned long len, unsigned long prot,
   322		unsigned long flag, unsigned long pgoff, bool killable)
   323	{
   324		unsigned long ret;
   325		struct mm_struct *mm = current->mm;
   326		unsigned long populate;
   327	
   328		ret = security_mmap_file(file, prot, flag);
   329		if (!ret) {
   330			if (killable) {
 > 331				if (down_write_killable(&mm->mmap_sem))
   332					return -EINTR;
   333			} else {
   334				down_write(&mm->mmap_sem);
   335			}
   336			ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff,
   337					    &populate);
   338			up_write(&mm->mmap_sem);
   339			if (populate)

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

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