Re: [PATCHv5 1/5] x86/mm: introduce arch_rnd() to compute 32/64 mmap rnd

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

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Hi Dmitry,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.10-rc8 next-20170214]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dmitry-Safonov/Fix-compatible-mmap-return-pointer-over-4Gb/20170215-025132
config: x86_64-randconfig-x014-201707 (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 error/warnings (new ones prefixed by >>):

   arch/x86/mm/mmap.c: In function 'arch_mmap_rnd':
>> arch/x86/mm/mmap.c:58:27: error: 'mmap_rnd_compat_bits' undeclared (first use in this function)
    # define mmap32_rnd_bits  mmap_rnd_compat_bits
                              ^
>> arch/x86/mm/mmap.c:83:35: note: in expansion of macro 'mmap32_rnd_bits'
     return arch_rnd(mmap_is_ia32() ? mmap32_rnd_bits : mmap64_rnd_bits);
                                      ^~~~~~~~~~~~~~~
   arch/x86/mm/mmap.c:58:27: note: each undeclared identifier is reported only once for each function it appears in
    # define mmap32_rnd_bits  mmap_rnd_compat_bits
                              ^
>> arch/x86/mm/mmap.c:83:35: note: in expansion of macro 'mmap32_rnd_bits'
     return arch_rnd(mmap_is_ia32() ? mmap32_rnd_bits : mmap64_rnd_bits);
                                      ^~~~~~~~~~~~~~~
>> arch/x86/mm/mmap.c:84:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +/mmap_rnd_compat_bits +58 arch/x86/mm/mmap.c

    52	 * Leave an at least ~128 MB hole with possible stack randomization.
    53	 */
    54	#define MIN_GAP (128*1024*1024UL + stack_maxrandom_size())
    55	#define MAX_GAP (TASK_SIZE/6*5)
    56	
    57	#ifdef CONFIG_64BIT
  > 58	# define mmap32_rnd_bits  mmap_rnd_compat_bits
    59	# define mmap64_rnd_bits  mmap_rnd_bits
    60	#else
    61	# define mmap32_rnd_bits  mmap_rnd_bits
    62	# define mmap64_rnd_bits  mmap_rnd_bits
    63	#endif
    64	
    65	static int mmap_is_legacy(void)
    66	{
    67		if (current->personality & ADDR_COMPAT_LAYOUT)
    68			return 1;
    69	
    70		if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
    71			return 1;
    72	
    73		return sysctl_legacy_va_layout;
    74	}
    75	
    76	static unsigned long arch_rnd(unsigned int rndbits)
    77	{
    78		return (get_random_long() & ((1UL << rndbits) - 1)) << PAGE_SHIFT;
    79	}
    80	
    81	unsigned long arch_mmap_rnd(void)
    82	{
  > 83		return arch_rnd(mmap_is_ia32() ? mmap32_rnd_bits : mmap64_rnd_bits);
  > 84	}
    85	
    86	static unsigned long mmap_base(unsigned long rnd)
    87	{

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