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

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Date:   Wed,  9 Feb 2022 10:35:59 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     cai.huoqing@...ux.dev
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Yang Shi <shy828301@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Colin Cross <ccross@...gle.com>,
        Alistair Popple <apopple@...dia.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH] fs/proc: task_mmu.c: Fix the error-unused variable 'migration'

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@...ux.dev>
---
 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