[PATCH] mm: Suppress mm/memory.o warning on older compilers if !CONFIG_NUMA_BALANCING

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The kbuild test robot reported the following after the merge of Automatic
NUMA Balancing when cross-compiling for avr32.

mm/memory.c: In function 'do_pmd_numa_page':
mm/memory.c:3593: warning: no return statement in function returning non-void

The code is unreachable but the avr32 cross-compiler was not new enough
to know that. This patch suppresses the warning.

Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
 mm/memory.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memory.c b/mm/memory.c
index e6a3b93..23f1fdf 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3590,6 +3590,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		     unsigned long addr, pmd_t *pmdp)
 {
 	BUG();
+	return 0;
 }
 #endif /* CONFIG_NUMA_BALANCING */
 

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