Re: [PATCH 1/2] mm, page_alloc: don't convert pfn to idx when merging

From: Vlastimil Babka
Date: Fri Dec 09 2016 - 07:33:50 EST

On 12/09/2016 01:14 PM, kbuild test robot wrote:
Hi Vlastimil,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.9-rc8 next-20161208]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

base: git:// master
config: i386-randconfig-s1-201649 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

mm/page_isolation.c: In function 'unset_migratetype_isolate':
mm/page_isolation.c:106:16: error: implicit declaration of function '__find_buddy_index' [-Werror=implicit-function-declaration]
buddy_idx = __find_buddy_index(page_idx, order);

Looks like my .config was missing MEMORY_ISOLATION. Fix is trivial and will include in v2 eventually after feedback.