On Fri, Jul 24, 2015 at 06:46:09AM +0800, kbuild test robot wrote:

tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   61f5f835b6f06fbc233481b5d3c0afd71ecf54e8
commit: b9e95c5dd1134d35b6c9aeaa3967ab5b3945ba73 [371/385] mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()
config: microblaze-nommu_defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout b9e95c5dd1134d35b6c9aeaa3967ab5b3945ba73
  # save the attached .config to linux build tree
  make.cross ARCH=microblaze 

All error/warnings (new ones prefixed by >>):

   mm/nommu.c: In function 'do_mmap':

quoted

quoted

mm/nommu.c:1248:30: error: 'vm_flags' redeclared as different kind of symbol

     unsigned long capabilities, vm_flags, result;
                                 ^
   mm/nommu.c:1241:15: note: previous definition of 'vm_flags' was here
       vm_flags_t vm_flags,
                  ^

This should fix the issue:

diff --git a/mm/nommu.c b/mm/nommu.c
index 530eea5af989..af2196e35013 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c

@@ -1245,7 +1245,7 @@ unsigned long do_mmap(struct file *file,
        struct vm_area_struct *vma;
        struct vm_region *region;
        struct rb_node *rb;
-       unsigned long capabilities, vm_flags, result;
+       unsigned long capabilities, result;
        int ret;
 
        *populate = 0;

@@ -1263,7 +1263,7 @@ unsigned long do_mmap(struct file *file,
 
        /* we've determined that we can make the mapping, now translate what we
         * now know into VMA flags */
-       vm_flags = determine_vm_flags(file, prot, flags, capabilities);
+       vm_flags |= determine_vm_flags(file, prot, flags, capabilities);
 
        /* we're going to need to record the mapping */
        region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL);

-- 
 Kirill A. Shutemov

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