From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793618511; b=txUCtVpSwgO0lZFdRJJs4DfK0bUoIJiDZrcNGk3Mr6BKRDek/szeSAYX9yfhKFQqi8z4 tKHy5rmSvmG4beyt+bgNUaojpx7UgaAm/Zk1p91PlzibUmCszXjqVRj9viwzh6dqL0O9k IG+iG/cLai0rx/wlTxv2Ye33MRbRgvsbywT+j7vpfFJ9gllDhbrteLYbYijjUXxBoKRfA 4n+XXm5YA3sNxCy1W3G79YTQsLVrOsD4NdAUd0cKjFxkVCMY99okhB1sdIlnnakQc1kbD KQ10IEEkaOYUjO8Dc7oqjSAoUBJvZp66br0TanFQkDXpcyvbwxrvMPq0hXqb3eTvweA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793618511; h=DMARC-Filter:Received:Received:DKIM-Signature:From:Date:Subject: MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id: References:In-Reply-To:To:Cc:X-Mailer:X-Developer-Signature: X-Developer-Key; bh=iPgeco6QWHwjQByiNB9RkhOOleyP2xs/e2xCzbuUZiE=; b=lBqU2nt6jprjMjupVf8GOP+kSueFQqyzmCpmMA6JAGZcKMQ2I9YPceESHlW6jjUmdUU0 dkj9p5WvtFLQjtxl7WWazm+XLQgEis5fwLh+YKZQgXH9Ubx628Mi/vFH5UwaJqGAn25fH NeQc7YfZFjdsQOTu6QSNVTRIkwP7y5WwP0j1uObV7j9BYFeUjJHvrF92vs8iiROe0HbTT mX3/l0H5YnzccZ6tLjFbjsK8b8Fz6frvzfvqcFgM+qWpAbzbEVikw+BYTQqefWfPlDIYx fUSYVipCj8N5D2WufTtXUTxvHPXzU+CjJDi9OGZQ9mZ/jKfhQCoZQto8ufOKhYDMBjw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=sGQxrLj2; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9305160A2611; Mon, 2 Nov 2026 11:21:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 9305160A2611 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=sGQxrLj2 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 98BB5293B; Mon, 2 Nov 2026 03:21:45 -0800 (PST) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ABBBC3F632; Mon, 2 Nov 2026 03:21:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793618508; bh=MWIk55sq3Xl5IhFPSCZgQqnLya5ldzX0H6ZlzYM7l/s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=sGQxrLj2PAVQM5fHkHevqVIfVin1ll/3g3ae4t/g8HEOkurxB70lXF0DZTL/IljQ5 rHKZXsGBRrFJanBWMs+pRElUxUB2BOmIRgyPg/tZXyH7V1J+xZrJnVL8vDsgkjLlnk oes83MtSFez0CJt//3pZ8TBKJnbeTFU4waApKUA8= From: Yeoreum Yun Date: Mon, 02 Nov 2026 11:21:15 +0000 Subject: [PATCH RESEND v2 02/21] ARM: mm: make 2-level pgd_t a scalar X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-dummy_ptxp3-v2-2-78840b2ec73c@arm.com> References: <20261102-dummy_ptxp3-v2-0-78840b2ec73c@arm.com> In-Reply-To: <20261102-dummy_ptxp3-v2-0-78840b2ec73c@arm.com> To: Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Catalin Marinas , Will Deacon , Arnd Bergmann , Andrew Morton , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , David Hildenbrand , Michal Hocko , Lorenzo Stoakes , Tianrui Zhao , Bibo Mao , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2019; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=4Z0osGAP3S0civxPu6dKKFX1qsd70Ol0fauRungSauY=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBq6HIvrNf0zi5GZGBTyShCkosyjcm/ve62Hffev ytAlT3j/TaJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCauhyLwAKCRBt1cPRWsUx M12BC/9v/yOQz+XWwbdtR0EhCi2ksiI4sjutQ/bwS5HN1By936VSeN3wcUH0K1fKV0O4ZIiW+s2 SfJf6SpaQEfPzplAyvkiXQnqW09aHWhOdT1UwkkxMNSsHXdfqi1M4FHRSWPCkb6K0FI12tyXCNB h4nuW6sYscec7ovrm5iXzQbZ18FdIgFk4raQqVHNTwmq+NydXKk3z4z1PKr6pQr9LF/IibhywF4 XjnF1eu4DGG5cokFCAkzEPmLAy7JprIb56giiRaum8uQRFE4AQ+Cp1WSXeJ2dYh0gtBvPfSBIC/ mxl4TgYzuAab+dAvT/qiL8ektFPYyYhHDUvtnnvaYZd7YDgQ3WVoVaWuqwj0VkGu2Zkeaqp0uR9 2vHpxiZK4KVn3Mm9K7SZrbcjdZUCchSWx3i9Tlu4I8WUFQY0nxAPvoTQsduekKtvwMxY20rvnhs Tv4dNY9GxHesD3XthpSYqMK/OdNippbv5S3PTdRLmqElgGJKdAMoOXuZeIn1q0haCDfG0= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 From: "David Hildenbrand (Arm)" As pgd_t is returned from a function like pgdp_get(), pgd_t shouldn't be an array. So, just use an u64, and extract the right 32bit value in pgd_val(). Leave the STRICT_MM_TYPECHECKS case alone for now. As an alternative, the STRICT_MM_TYPECHECKS approach could be used here as well, but using an u64 looks conceptually cleaner, even though pgd_val() gets a bit more involved. Signed-off-by: David Hildenbrand (Arm) --- arch/arm/include/asm/pgtable-2level-types.h | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/pgtable-2level-types.h b/arch/arm/include/asm/pgtable-2level-types.h index 650e793f41429..805044ea315b7 100644 --- a/arch/arm/include/asm/pgtable-2level-types.h +++ b/arch/arm/include/asm/pgtable-2level-types.h @@ -25,7 +25,7 @@ typedef struct { pteval_t pgprot; } pgprot_t; #define pte_val(x) ((x).pte) #define pmd_val(x) ((x).pmd) -#define pgd_val(x) ((x).pgd[0]) +#define pgd_val(x) ((x).pgd[0]) #define pgprot_val(x) ((x).pgprot) #define __pte(x) ((pte_t) { (x) } ) @@ -36,14 +36,28 @@ typedef struct { pteval_t pgprot; } pgprot_t; /* * .. while these make it easier on the compiler */ +typedef u64 pgdval_t; + typedef pteval_t pte_t; typedef pmdval_t pmd_t; -typedef pmdval_t pgd_t[2]; +typedef pgdval_t pgd_t; typedef pteval_t pgprot_t; #define pte_val(x) (x) #define pmd_val(x) (x) -#define pgd_val(x) ((x)[0]) + +static inline pmdval_t pgd_val(pgd_t pgd) +{ + /* + * A PGD entry actually corresponds to two PMD entries in the PMD table. + * Both PMD entries point to PTE tables residing in the same physical page, + * but at different offsets. See include/asm/pgtable-2level.h for details. + * + * Historically, pgd_val() has returned the lower of the two PMD entries. + */ + return (*(pmdval_t (*)[2])&pgd)[0]; +} + #define pgprot_val(x) (x) #define __pte(x) (x) -- 2.43.0