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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Uladzislau Rezki , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrey Konovalov , Marco Elver , Vincenzo Frascino , Peter Collingbourne , Catalin Marinas , Will Deacon , Ryan.Roberts@arm.com, david.hildenbrand@arm.com Cc: Muhammad Usama Anjum , Ryan Roberts Subject: [PATCH v2 3/3] mm: skip KASAN tagging for page-allocated page tables Date: Tue, 24 Mar 2026 13:26:29 +0000 Message-ID: <20260324132631.482520-4-usama.anjum@arm.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260324132631.482520-1-usama.anjum@arm.com> References: <20260324132631.482520-1-usama.anjum@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: EE66714000E X-Stat-Signature: 5dpitm3fusyyre338okxfswdci7da5qw X-HE-Tag: 1774358823-629294 X-HE-Meta: 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 m0rCsLGN rK9fp73kcmz/M/PBlSAyDJPDOfHR5Ls7yEV6T1Itnhu8tn87PpiaPw6Y+51XV7PWQQlSxy3yn7x16AM1X4+wq1XzakHUgIttQoNSsex7Th9PhA01K/fvFAO2XmpSA7nfe0PZJYKgdIfo8xjQ/qrqIHnr0tHbuFy9dk8dZZC02FE5gXhFMKUYbP9udRnqfl8ykH71ZVcbl1clnx/GCFgejWkM/Ahg3JUcLIzBL25zFQaAquG7NT7chm6HGHw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Page tables are always accessed via the linear mapping with a match-all tag, so HW-tag KASAN never checks them. For page-allocated tables (PTEs and PGDs etc), avoid the tag setup and poisoning overhead by using __GFP_SKIP_KASAN. SLUB-backed page tables are unchanged for now. (They aren't widely used and require more SLUB related skip logic. Leave it later.) Reviewed-by: Ryan Roberts Signed-off-by: Muhammad Usama Anjum --- Changes since v1: - Update description to mention SLUB-backed page tables are unchanged --- include/asm-generic/pgalloc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index 57137d3ac1592..051aa1331051c 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -4,7 +4,7 @@ #ifdef CONFIG_MMU -#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO) +#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO | __GFP_SKIP_KASAN) #define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT) /** -- 2.47.3