Re: [PATCH 1/2] x86/mm: don't mmap() over 4GB with compat syscall

[kbuild test robot]

Hi Dmitry,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.10-rc3 next-20170111]
[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/20170112-185732
config: x86_64-randconfig-x016-201702 (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 errors (new ones prefixed by >>):

   arch/x86/kernel/sys_x86_64.c: In function 'find_start_end':
>> arch/x86/kernel/sys_x86_64.c:122:13: error: 'mmap_rnd_compat_bits' undeclared (first use in this function)
         1UL << mmap_rnd_compat_bits);
                ^~~~~~~~~~~~~~~~~~~~
   arch/x86/kernel/sys_x86_64.c:122:13: note: each undeclared identifier is reported only once for each function it appears in
   arch/x86/kernel/sys_x86_64.c: In function 'arch_get_unmapped_area_topdown':
   arch/x86/kernel/sys_x86_64.c:202:31: error: 'mmap_rnd_compat_bits' undeclared (first use in this function)
       unsigned long rnd = 1UL << mmap_rnd_compat_bits;
                                  ^~~~~~~~~~~~~~~~~~~~

vim +/mmap_rnd_compat_bits +122 arch/x86/kernel/sys_x86_64.c

   116				*end = 0x80000000;
   117				return;
   118			}
   119			if (current->thread.status & TS_COMPAT) {
   120				if (current->flags & PF_RANDOMIZE)
   121					*begin = randomize_page(*begin,
 > 122						1UL << mmap_rnd_compat_bits);
   123				*end = IA32_PAGE_OFFSET;
   124				return;
   125			}

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