linux-kernel - [PATCH] mm/highmem: fix __kmap_to

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Message-ID:
 <SJ0PR07MB86317E00EC0C59DA60935FDCD18DA@SJ0PR07MB8631.namprd07.prod.outlook.com>
Date: Fri, 16 Jan 2026 17:18:21 +0000
From: William Tambe <williamt@...ence.com>
To: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC: "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "jcmvbkbc@...il.com" <jcmvbkbc@...il.com>
Subject: [PATCH] mm/highmem: fix __kmap_to_page() build error

>From 706fa431358390713c47667f6bcaecce56d071cc Mon Sep 17 00:00:00 2001
From: William Tambe <williamt@...ence.com>
Date: Thu, 11 Dec 2025 12:38:19 -0800
Subject: [PATCH] mm/highmem: fix __kmap_to_page() build error

This changes fixes following build error which is probably a miss from:
ef6e06b2ef87 highmem: fix kmap_to_page() for kmap_local_page() addresses

mm/highmem.c:184:66: error: 'pteval' undeclared (first use in this
function); did you mean 'pte_val'?
184 | idx = arch_kmap_local_map_idx(i, pte_pfn(pteval));

In __kmap_to_page(), pteval is used but does not exist in the function.

Reviewed-by: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: William Tambe <williamt@...ence.com>
---
 mm/highmem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/highmem.c b/mm/highmem.c
index b5c8e4c2d5d4..a33e41183951 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -180,12 +180,13 @@ struct page *__kmap_to_page(void *vaddr)
 		for (i = 0; i < kctrl->idx; i++) {
 			unsigned long base_addr;
 			int idx;
+			pte_t pteval = kctrl->pteval[i];
 
 			idx = arch_kmap_local_map_idx(i, pte_pfn(pteval));
 			base_addr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
 
 			if (base_addr == base)
-				return pte_page(kctrl->pteval[i]);
+				return pte_page(pteval);
 		}
 	}
 
-- 
2.43.0