tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   a2d887dee78e23dc092ff14ae2ad22592437a328
commit: cd4687a1102a69d9045d09e0af6bb9bacfb49ee5 [185/397] mm/nommu: use alloc_pages_exact() rather than it's own implementation
config: m32r-m32104ut_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 cd4687a1102a69d9045d09e0af6bb9bacfb49ee5
  # save the attached .config to linux build tree
  make.cross ARCH=m32r 

All warnings:

   mm/nommu.c: In function 'do_mmap_private':
>> mm/nommu.c:1193:8: warning: assignment makes pointer from integer without a cast
      base = __get_free_pages(GFP_KERNEL, order);
           ^

vim +1193 mm/nommu.c

  1177		/* allocate some memory to hold the mapping
  1178		 * - note that this may not return a page-aligned address if the object
  1179		 *   we're allocating is smaller than a page
  1180		 */
  1181		order = get_order(len);
  1182		kdebug("alloc order %d for %lx", order, len);
  1183	
  1184		total = 1 << order;
  1185		point = len >> PAGE_SHIFT;
  1186	
  1187		/* we don't want to allocate a power-of-2 sized page set */
  1188		if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) {
  1189			total = point;
  1190			kdebug("try to alloc exact %lu pages", total);
  1191			base = alloc_pages_exact(len, GFP_KERNEL);
  1192		} else {
> 1193			base = __get_free_pages(GFP_KERNEL, order);
  1194		}
  1195	
  1196		if (!base)
  1197			goto enomem;
  1198	
  1199		atomic_long_add(total, &mmap_pages_allocated);
  1200	
  1201		region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY;

---
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