linux-kernel - [PATCH 05/15] mm/swap: print bad swap offset entry in get_swap

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Date:   Mon, 9 May 2022 21:14:06 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <willy@...radead.org>, <vbabka@...e.cz>, <dhowells@...hat.com>,
        <neilb@...e.de>, <apopple@...dia.com>, <david@...hat.com>,
        <surenb@...gle.com>, <peterx@...hat.com>,
        <naoya.horiguchi@....com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH 05/15] mm/swap: print bad swap offset entry in get_swap_device

If offset exceeds the si->max, print bad swap offset entry to help debug
the unexpected case.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.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