[PATCH] mm/hwpoison: fix build error without CONFIG_MEMORY_FAILURE

[Hui Tang]

Building without CONFIG_MEMORY_FAILURE will fail:

mm/memory-failure.o: In function `action_result':
memory-failure.c: undefined reference to `memblk_nr_poison_inc'
mm/memory-failure.o: In function `page_handle_poison':
memory-failure.c: undefined reference to `memblk_nr_poison_inc'
mm/memory-failure.o: In function `__get_huge_page_for_hwpoison':
memory-failure.c: undefined reference to `memblk_nr_poison_inc'
mm/memory-failure.o: In function `unpoison_memory':
memory-failure.c: undefined reference to `memblk_nr_poison_sub'
mm/memory-failure.o: In function `num_poisoned_pages_inc':
memory-failure.c: undefined reference to `memblk_nr_poison_inc'

Add CONFIG_MEMORY_FAILURE wrapper for invoking memblk_nr_poison_{inc|sub}.

Fixes: 69b496f03bb4 ("mm/hwpoison: introduce per-memory_block hwpoison counter")
Signed-off-by: Hui Tang <tanghui20@xxxxxxxxxx>
---
 mm/memory-failure.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 03479895086d..5bb9d2d20234 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -77,14 +77,18 @@ static bool hw_memory_failure __read_mostly = false;
 void num_poisoned_pages_inc(unsigned long pfn)
 {
 	atomic_long_inc(&num_poisoned_pages);
+#ifdef CONFIG_MEMORY_FAILURE
 	memblk_nr_poison_inc(pfn);
+#endif
 }
 
 static inline void num_poisoned_pages_sub(unsigned long pfn, long i)
 {
 	atomic_long_sub(i, &num_poisoned_pages);
+#ifdef CONFIG_MEMORY_FAILURE
 	if (pfn != -1UL)
 		memblk_nr_poison_sub(pfn, i);
+#endif
 }
 
 /*
-- 
2.17.1