Hi Michal,

[auto build test ERROR on mmotm/master]
[also build test ERROR on next-20170509]
[cannot apply to v4.11]
[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/Michal-Hocko/mm-vmalloc-fix-vmalloc-users-tracking-properly/20170509-224536
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: c6x-evmc6678_defconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=c6x 

All errors (new ones prefixed by >>):

   mm/nommu.c:51:5: sparse: symbol 'sysctl_nr_trim_pages' was not declared. Should it be static?
   mm/nommu.c:52:5: sparse: symbol 'heap_stack_gap' was not declared. Should it be static?
   mm/nommu.c:63:35: sparse: symbol 'generic_file_vm_ops' was not declared. Should it be static?
   mm/nommu.c:240:6: sparse: symbol '__vmalloc_node_flags' was not declared. Should it be static?
   mm/nommu.c:1175:48: sparse: incorrect type in argument 2 (different address spaces)
   mm/nommu.c:1175:48:    expected char [noderef] <asn:1>*<noident>
   mm/nommu.c:1175:48:    got void *[assigned] base
   mm/nommu.c:1790:15: sparse: symbol 'arch_get_unmapped_area' was not declared. Should it be static?
   mm/nommu.c:638:9: sparse: context imbalance in '__put_nommu_region' - wrong count at exit
   mm/nommu.c:659:13: sparse: context imbalance in 'put_nommu_region' - unexpected unlock
   In file included from include/asm-generic/io.h:767:0,
                    from ./arch/c6x/include/generated/asm/io.h:1,
                    from include/linux/io.h:25,
                    from include/linux/irq.h:24,
                    from include/asm-generic/hardirq.h:12,
                    from arch/c6x/include/asm/hardirq.h:18,
                    from include/linux/hardirq.h:8,
                    from include/linux/memcontrol.h:24,
                    from include/linux/swap.h:8,
                    from mm/nommu.c:23:
   include/linux/vmalloc.h:85:21: error: conflicting types for '__vmalloc_node_flags_caller'
    static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags, void* caller)
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmalloc.h:84:14: note: previous declaration of '__vmalloc_node_flags_caller' was here
    extern void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmalloc.h: In function '__vmalloc_node_flags_caller':
   include/linux/vmalloc.h:87:9: error: implicit declaration of function '__vmalloc_node_flags' [-Werror=implicit-function-declaration]
     return __vmalloc_node_flags(size, node, flags);
            ^~~~~~~~~~~~~~~~~~~~
   include/linux/vmalloc.h:87:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return __vmalloc_node_flags(size, node, flags);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/nommu.c: At top level:
>> mm/nommu.c:240:7: error: conflicting types for '__vmalloc_node_flags'
    void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags)
          ^~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:767:0,
                    from ./arch/c6x/include/generated/asm/io.h:1,
                    from include/linux/io.h:25,
                    from include/linux/irq.h:24,
                    from include/asm-generic/hardirq.h:12,
                    from arch/c6x/include/asm/hardirq.h:18,
                    from include/linux/hardirq.h:8,
                    from include/linux/memcontrol.h:24,
                    from include/linux/swap.h:8,
                    from mm/nommu.c:23:
   include/linux/vmalloc.h:87:9: note: previous implicit declaration of '__vmalloc_node_flags' was here
     return __vmalloc_node_flags(size, node, flags);
            ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__vmalloc_node_flags +240 mm/nommu.c

8518609d Robert P. J. Day 2007-10-19  234  	 * returns only a logical address.
^1da177e Linus Torvalds   2005-04-16  235  	 */
84097518 Nick Piggin      2006-03-22  236  	return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM);
^1da177e Linus Torvalds   2005-04-16  237  }
b5073173 Paul Mundt       2007-07-21  238  EXPORT_SYMBOL(__vmalloc);
^1da177e Linus Torvalds   2005-04-16  239  
c7e6abdb Michal Hocko     2017-05-03 @240  void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags)
c7e6abdb Michal Hocko     2017-05-03  241  {
c7e6abdb Michal Hocko     2017-05-03  242  	return __vmalloc(size, flags, PAGE_KERNEL);
c7e6abdb Michal Hocko     2017-05-03  243  }

:::::: The code at line 240 was first introduced by commit
:::::: c7e6abdbe12a86cfa1bdba2bd3e9f5fdb1cb175b mm: introduce kv[mz]alloc helpers

:::::: TO: Michal Hocko <mhocko@suse.com>
:::::: CC: Johannes Weiner <hannes@cmpxchg.org>

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