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Date:   Thu, 8 Jun 2023 18:21:41 -0700 (PDT)
From:   Hugh Dickins <hughd@google.com>
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Subject: [PATCH v2 12/32] mm/vmalloc: vmalloc_to_page() use
 pte_offset_kernel()
In-Reply-To: <c1c9a74a-bc5b-15ea-e5d2-8ec34bc921d@google.com>
Message-ID: <696386a-84f8-b33c-82e5-f865ed6eb39@google.com>
References: <c1c9a74a-bc5b-15ea-e5d2-8ec34bc921d@google.com>
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Precedence: bulk

vmalloc_to_page() was using pte_offset_map() (followed by pte_unmap()),
but it's intended for userspace page tables: prefer pte_offset_kernel().

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
---
 mm/vmalloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 9683573f1225..741722d247d5 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -703,11 +703,10 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
 	if (WARN_ON_ONCE(pmd_bad(*pmd)))
 		return NULL;
 
-	ptep = pte_offset_map(pmd, addr);
+	ptep = pte_offset_kernel(pmd, addr);
 	pte = *ptep;
 	if (pte_present(pte))
 		page = pte_page(pte);
-	pte_unmap(ptep);
 
 	return page;
 }
-- 
2.35.3