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From:   Miaohe Lin <linmiaohe@huawei.com>
To:     <akpm@linux-foundation.org>
CC:     <willy@infradead.org>, <vbabka@suse.cz>, <dhowells@redhat.com>,
        <neilb@suse.de>, <apopple@nvidia.com>, <david@redhat.com>,
        <surenb@google.com>, <peterx@redhat.com>,
        <naoya.horiguchi@nec.com>, <linux-mm@kvack.org>,
        <linux-kernel@vger.kernel.org>, <linmiaohe@huawei.com>
Subject: [PATCH 05/15] mm/swap: print bad swap offset entry in get_swap_device
Date:   Mon, 9 May 2022 21:14:06 +0800
Message-ID: <20220509131416.17553-6-linmiaohe@huawei.com>
In-Reply-To: <20220509131416.17553-1-linmiaohe@huawei.com>
References: <20220509131416.17553-1-linmiaohe@huawei.com>
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If offset exceeds the si->max, print bad swap offset entry to help debug
the unexpected case.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
 mm/swapfile.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 0aee6286d6a7..d4b81ca887c0 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1272,6 +1272,7 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry)
 out:
 	return NULL;
 put_out:
+	pr_err("%s: %s%08lx\n", __func__, Bad_offset, entry.val);
 	percpu_ref_put(&si->users);
 	return NULL;
 }
-- 
2.23.0