linux-kernel - Re: [PATCH v3 10/16] mm: replace pmd_to_swp_entry() with softleaf_from

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Message-ID: <cd97b6ec-00f9-45a4-9ae0-8f009c212a94@lucifer.local>
Date: Fri, 21 Nov 2025 19:23:37 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>,
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Subject: Re: [PATCH v3 10/16] mm: replace pmd_to_swp_entry() with
 softleaf_from_pmd()

Hi Andrew,

One small mistake on this patch as discovered by Vlasta, fix-patch attached!

Thanks, Lorenzo

----8<----
>From 0fbf3f749d378153533f041d1be27dd498dad3a1 Mon Sep 17 00:00:00 2001
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Date: Fri, 21 Nov 2025 19:20:57 +0000
Subject: [PATCH] mm/page_table_check: fix device private check

We should check writable, not readable/writable.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
 mm/page_table_check.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 9af1ecff5221..741884645ab0 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -181,7 +181,7 @@ EXPORT_SYMBOL(__page_table_check_pud_clear);
 /* Whether the swap entry cached writable information */
 static inline bool softleaf_cached_writable(softleaf_t entry)
 {
-	return softleaf_is_device_private(entry) ||
+	return softleaf_is_device_private_write(entry) ||
 		softleaf_is_migration_write(entry);
 }

--
2.51.2