linux-kernel - [PATCH] xfs: Use WARN_ON_ONCE for bailout mount-operation

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Date:   Fri, 30 Aug 2019 10:41:10 +0900
From:   Austin Kim <austindh.kim@...il.com>
To:     darrick.wong@...cle.com
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        austindh.kim@...il.com
Subject: [PATCH] xfs: Use WARN_ON_ONCE for bailout mount-operation

If the CONFIG_BUG is enabled, BUG is executed and then system is crashed.
However, the bailout for mount is no longer proceeding.

Using WARN_ON_ONCE rather than BUG can prevent this situation.

Signed-off-by: Austin Kim <austindh.kim@...il.com>
---
 fs/xfs/xfs_mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 322da69..3ab2acf 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -214,7 +214,7 @@ xfs_initialize_perag(
 
 		spin_lock(&mp->m_perag_lock);
 		if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
-			BUG();
+			WARN_ON_ONCE(1);
 			spin_unlock(&mp->m_perag_lock);
 			radix_tree_preload_end();
 			error = -EEXIST;
-- 
2.6.2