[PATCH] fs/proc: task_mmu.c: Fix the error-unused variable 'migration'

[Cai Huoqing <cai.huoqing@xxxxxxxxx>]

Avoid the error-unused variable 'migration' when
CONFIG_TRANSPARENT_HUGEPAGE and CONFIG_ARCH_ENABLE_THP_MIGRATION
are not enabled.

Signed-off-by: Cai Huoqing <cai.huoqing@xxxxxxxxx>
---
 fs/proc/task_mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index bc2f46033231..b055ff29204d 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1441,7 +1441,7 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 	spinlock_t *ptl;
 	pte_t *pte, *orig_pte;
 	int err = 0;
-	bool migration = false;
+	bool migration __maybe_unused = false;
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	ptl = pmd_trans_huge_lock(pmdp, vma);
-- 
2.25.1