From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 839A7FED3C5 for ; Fri, 24 Apr 2026 13:02:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EFAAA6B0098; Fri, 24 Apr 2026 09:02:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id ED2B46B0099; Fri, 24 Apr 2026 09:02:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E0F716B009D; Fri, 24 Apr 2026 09:02:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id D0DEF6B0098 for ; Fri, 24 Apr 2026 09:02:42 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01b-stub [10.200.18.250]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 84AF41C0033 for ; Fri, 24 Apr 2026 13:02:42 +0000 (UTC) X-FDA: 84693463764.22.823D01F Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf07.hostedemail.com (Postfix) with ESMTP id C18D340006 for ; Fri, 24 Apr 2026 13:02:40 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=mqr3co6o; spf=pass (imf07.hostedemail.com: domain of dev.jain@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=dev.jain@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1777035760; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PtyGDrjmtBMDR0kf2H/Ra51IUF4+3lNSVkXS2bqhdL4=; b=t0xpgOrVhWbsV9OIU8sOUMXUk5gVzX8ZpreHkUJPTSi61dY3y5uRrJDujBXOK7oTbh1nQ7 nv4s11ahaFd2MliuHcJ9FzPPVVBcrF/6KXtujltZKS7VrvTnhYmV2v/4n8o++3NpHLJUHE LC1MlG6hdHpS1n3rXVpl7vVAS9kB5LU= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=mqr3co6o; spf=pass (imf07.hostedemail.com: domain of dev.jain@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=dev.jain@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777035760; a=rsa-sha256; cv=none; b=BhGh9P0tGYj/QfjiotcvIcAmiBYPAV3u48MXRreuqNoeaZjHXK5U+8KzcsyCr0VqO88lCA SThURvo3Ab07Csi9ceZbRQwHhLX0Iefc4O1/+mHHFWhawcCAF5ApO6HOW7BzKo1Tt9vlsm +2qEswCMfx/QJiut2Wtdg8T81FiA6Kg= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 54E8F1BB0; Fri, 24 Apr 2026 06:02:34 -0700 (PDT) Received: from a080796.blr.arm.com (a080796.arm.com [10.164.21.51]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CAE253F641; Fri, 24 Apr 2026 06:02:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1777035759; bh=uOi1Rk96oeur1i6i7Mh3ItL6sBlXiIQnfqF3cWvMO04=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mqr3co6oZde7WmeQ7llcR+8DKaBN6lEdV2rzuhYWXuiAOG/rOW4u/uqnqvMcnrVT9 WNtGghnwtzskbxD0OblP/47MNHQJQeWXs7DPMybVKZtIhHS+GFf2mzbMd1Ey9XuzMi vJHvOkfbleWtTQT86FCRDg5sXi0b91IgL4QhTL20= From: Dev Jain To: arnd@arndb.de, kees@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, david@kernel.org, urezki@gmail.com Cc: dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, tglx@kernel.org, usama.anjum@arm.com, mathieu.desnoyers@efficios.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ryan Roberts , Catalin Marinas Subject: [PATCH v3 3/3] mm: skip KASAN tagging for page-allocated page tables Date: Fri, 24 Apr 2026 18:31:57 +0530 Message-Id: <20260424130157.3163009-4-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260424130157.3163009-1-dev.jain@arm.com> References: <20260424130157.3163009-1-dev.jain@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C18D340006 X-Stat-Signature: b6dbeje7e6tsi7t3eaz7twiggazdz73r X-Rspam-User: X-HE-Tag: 1777035760-133878 X-HE-Meta: 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 CyRBAoVn e0SjfPJnq+2uS55P8vDC/zL1dsOWTGmXiBCAVn8i1uDJHg0w5K5mVQ1ypfZ0lWfjgMBgq0kE2C7ZXK8JFFqw0hRlIGfFpMISb7+tmy3ZA3uXJ0ojfdjI3rZE0lxmTa4YIUl/GNC52AyT4gkAaRAVp2te1mlmw+G+K9fMvhSlMWg9gawo96+/DS1ZNMVRwT8GjYcxxQSqJaNPwD62A2dtTSajdbq0Ytn2aSzLvELktd1k7A4sFUhsnaoW1vIAIknIPlGvrEjewl3NKYPg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Muhammad Usama Anjum 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 Acked-by: David Hildenbrand (Arm) Reviewed-by: Catalin Marinas --- 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) /** -- 2.34.1