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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B9C97C61DD6 for ; Wed, 2 Sep 2026 11:56:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yJeiVF+eiU/PbOmcgn8JbQ9tb0UPwbznMRQqeynmAQE=; b=NTEdmj6wW9DYgt ubTfQQ6bgaM61e85N4LYrqmHk5CMNuC5Thd3/mXIYJ+N08+nwuKZLNPKa+xzrxsuGmG2odINtxLgw eWdkbEn9Yz8SpvqdbBSwOpfcvhbj3Zu4aZkQaPNnpJ0Y/slPAT+1s/0pWHBcYgLy1QynFodbHc+rH Ux4DxboejduFxVs3zJOGB5ZfbN2dlmb9Z43CLPj/pUr2ZV9lWu2WYFJ6W7ddI0qKkknTZev+X8/kG ZMG9fVyhUy57UWg3dMlEcJkP17DfRH1YTi4KbhwrQ5sJXKQxMcXBPXGGudV4xeFSH9UbKl8uAjV9L ZGwOFPaVEulykWkGo9Zg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1jaI-0000000EZJm-1jKX; Wed, 02 Sep 2026 11:56:54 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1jaF-0000000EZIW-3lDt; Wed, 02 Sep 2026 11:56:53 +0000 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 25B9F1E4D; Wed, 2 Sep 2026 04:56:47 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C29DA3F85F; Wed, 2 Sep 2026 04:56:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788350210; bh=gPlnE5UqZRk40YfWFz/1w9GlKcNlqtJOo/oAxLycbvE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=JngvOrh/7RH2K28ggppoS4NPOaZa16P0lMCoxQdm8Y5sORQtjxmHS2nRWh7A+nD4U lR6pGdNIo04IsFUKW5Iu2DeZy5RCXDzqAoufI7eiLPS9ULkCP3Objs0zsXamRb15xM 79g8rzGAvghuXLj6fzSyLmOEqrVRnC+EMjOuSpSI= From: Yeoreum Yun Date: Wed, 02 Sep 2026 12:56:04 +0100 Subject: [PATCH RFC v3 02/21] ARM: mm: make 2-level pgd_t a scalar MIME-Version: 1.0 Message-Id: <20260902-dummy_ptxp3-v3-2-5d8f5b17c25c@arm.com> References: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@arm.com> In-Reply-To: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@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=2017; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=uhcO6NTPYBqTkI+U1pSNHYmMsIjTOQrElUAua45fg4s=; b=kA0DAAoBbdXD0VrFMTMByyZiAGqYDuKh4pUBsXDB1v/n9ZVHNsXgpbZHusYBh6IUK6klb7xYB YkBswQAAQoAHRYhBC2D4JLdBTO4WHWknW3Vw9FaxTEzBQJqmA7iAAoJEG3Vw9FaxTEz0BQL/2nk sf3h4xmh3cZtnS+lTvf+itMKAMxUvApGWmC4Wv39xE1jps4ZQyzWb/SJp98V66g00L30MWVLQgD tat6tOwX2/q+6qy17JKwUz/7i6TzD/TZzQ32xBFcvYhluUlq4Pz649NjIZ1uEl17UZziViJLQZo B644h4n9Wc3Fi0IzgaW+5KhHLWdt3ZRDR4WZpZi7IjFTFL9oWkZy+PhQQbx81hRv7nsS9YwgULP fPyvywMC5/BRNiJv4Bv2rw2drYfgLwbtkRYVXdzToW0jskEmlweWHUbj/LEfWkimMjxMWvghuAo Oeu5Ftb+6z/NoWkVWxtiZgTWcKlD6bqJRc4X95Ub5E3L9cgOVL/seXRA+oZwAczjdUHNqa91mAl pnh0MNHv3f/9NAQhLk8LtdSDcYIXBjJ6AbC+3whUFU8/q87D2oQ4K6sGHgvH6W2nYMjrBVc4by4 tF8lhm2Doykt9IqmrtjwiMUDhbIJElBOahrbMYMCzbEgkFh+2nRz6QH8GanA== X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260902_045652_024522_F26D74C3 X-CRM114-Status: GOOD ( 14.74 ) X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org 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 650e793f4142..805044ea315b 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 -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv 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 D4DE2C624D0 for ; Wed, 2 Sep 2026 11:56:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EE3296B008C; Wed, 2 Sep 2026 07:56:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E6CA46B0092; Wed, 2 Sep 2026 07:56:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D5E626B0096; Wed, 2 Sep 2026 07:56:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id A720F6B008C for ; Wed, 2 Sep 2026 07:56:54 -0400 (EDT) Received: from smtpin08.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 4352C1601C2 for ; Wed, 2 Sep 2026 11:56:54 +0000 (UTC) X-FDA: 85168670748.08.211F02B Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf01.hostedemail.com (Postfix) with ESMTP id 014F440009 for ; Wed, 2 Sep 2026 11:56:51 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b="JngvOrh/"; spf=pass (imf01.hostedemail.com: domain of yeoreum.yun@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=yeoreum.yun@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=1788350212; 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-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=TmJSRs9kZhlK/7cZ8ONyoA23988wKKHMM3sGINh8g2c=; b=KixTokDqlCq8FptvMTrXyWt8I2JrrgyvONBn96aegxB7tKJ4DIhb1akQrJF2p0smcGSNgp fPS5duaP4Bk2ya8JOaIB3dnkCbeQG0Rg/Q+bAMQt4VpGR8NOQ9g9JEOpACAxHKwbGPukbq jyaJZMENaSIN310XIAxMpzK8PhMkow4= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788350212; b=Qgc59q/otCeYX280jR3kp+XXpu/Pa7FYpyw1k2LtnIgn2VYy69ma+lh2ovhrAjqcB0FLUV pvJHw9cyi68rsVIuePHX/PZafwcRocfCrrJ3r7x+59WMfz0jD/7lZJj8YaqKulxI/g4l8K m3db8TrwAsWFN3EwgNPYnjdMAiBxdmI= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b="JngvOrh/"; spf=pass (imf01.hostedemail.com: domain of yeoreum.yun@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=yeoreum.yun@arm.com; dmarc=pass (policy=none) header.from=arm.com 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 25B9F1E4D; Wed, 2 Sep 2026 04:56:47 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C29DA3F85F; Wed, 2 Sep 2026 04:56:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788350210; bh=gPlnE5UqZRk40YfWFz/1w9GlKcNlqtJOo/oAxLycbvE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=JngvOrh/7RH2K28ggppoS4NPOaZa16P0lMCoxQdm8Y5sORQtjxmHS2nRWh7A+nD4U lR6pGdNIo04IsFUKW5Iu2DeZy5RCXDzqAoufI7eiLPS9ULkCP3Objs0zsXamRb15xM 79g8rzGAvghuXLj6fzSyLmOEqrVRnC+EMjOuSpSI= From: Yeoreum Yun Date: Wed, 02 Sep 2026 12:56:04 +0100 Subject: [PATCH RFC v3 02/21] ARM: mm: make 2-level pgd_t a scalar MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260902-dummy_ptxp3-v3-2-5d8f5b17c25c@arm.com> References: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@arm.com> In-Reply-To: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@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=2017; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=uhcO6NTPYBqTkI+U1pSNHYmMsIjTOQrElUAua45fg4s=; b=kA0DAAoBbdXD0VrFMTMByyZiAGqYDuKh4pUBsXDB1v/n9ZVHNsXgpbZHusYBh6IUK6klb7xYB YkBswQAAQoAHRYhBC2D4JLdBTO4WHWknW3Vw9FaxTEzBQJqmA7iAAoJEG3Vw9FaxTEz0BQL/2nk sf3h4xmh3cZtnS+lTvf+itMKAMxUvApGWmC4Wv39xE1jps4ZQyzWb/SJp98V66g00L30MWVLQgD tat6tOwX2/q+6qy17JKwUz/7i6TzD/TZzQ32xBFcvYhluUlq4Pz649NjIZ1uEl17UZziViJLQZo B644h4n9Wc3Fi0IzgaW+5KhHLWdt3ZRDR4WZpZi7IjFTFL9oWkZy+PhQQbx81hRv7nsS9YwgULP fPyvywMC5/BRNiJv4Bv2rw2drYfgLwbtkRYVXdzToW0jskEmlweWHUbj/LEfWkimMjxMWvghuAo Oeu5Ftb+6z/NoWkVWxtiZgTWcKlD6bqJRc4X95Ub5E3L9cgOVL/seXRA+oZwAczjdUHNqa91mAl pnh0MNHv3f/9NAQhLk8LtdSDcYIXBjJ6AbC+3whUFU8/q87D2oQ4K6sGHgvH6W2nYMjrBVc4by4 tF8lhm2Doykt9IqmrtjwiMUDhbIJElBOahrbMYMCzbEgkFh+2nRz6QH8GanA== X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Stat-Signature: 6ybmze6ya8oki3oxotu7jugg3o7o1uhd X-Rspamd-Queue-Id: 014F440009 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1788350211-810004 X-HE-Meta: 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 3P0a+koj YYs1LZMbQRIelSMiIXMXrCIcCsaxaBvg08AnLLYJyXeJY0oBPg7FP40ONh71R7UY+lzDpZyp5MPamN1e0bYd5/kc+ajF1WE6dBR87xwW7MaSvGgceKuDu+0ykCh/061y3uwrwRt1ZefdBR10U6eAKYvUW5bP/hvVJiewothoKb+A/cnFkb8tlI1J/WGKMGuTJhy8+u2uSW/i9wtjYLDBhfPRuaQy6CZu88Yy+VX11HQWT50DLH8Q32RE73XDpz2MsZs+BNppbg+9U46A= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 650e793f4142..805044ea315b 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 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5A4E8C624D0 for ; Wed, 2 Sep 2026 11:57:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qMbRizv/iMI1Wxo2SW+kUEQj300fIlGndpc21lpPTzI=; b=LkxJkrKU+kRSmX pZhK1EyYhaC7mr2VhW/50X4PVA5pFG45/x9pGMbjkr6sjtX1aqUTZnUPyrNRgWDWe300dRwBkpAa5 tgT11Skg5LAWq59P+d1M7pePKoBlUgaDo6hLClwjFbpzG40Nkhe9KZAeiRrFVPfVIQ9eIIML6N4kU y+c1Qu+D/waW6bS9hNqcYaphC3/IOqGwsPWfFvXF2Aa11FTjANTDRXGRbZURss6S8gNSHg9m9aAAR i8hHZRi1cZr8yqPMHnEZfYOqjhGV6d5geKeEojCggoKKzCCpXViXwt84Pjq2sE/VwLKQtTjQkS/03 ctoUeexbkhAyssrtWkig==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1jaI-0000000EZJw-2H5y; Wed, 02 Sep 2026 11:56:54 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1jaF-0000000EZIW-3lDt; Wed, 02 Sep 2026 11:56:53 +0000 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 25B9F1E4D; Wed, 2 Sep 2026 04:56:47 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C29DA3F85F; Wed, 2 Sep 2026 04:56:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788350210; bh=gPlnE5UqZRk40YfWFz/1w9GlKcNlqtJOo/oAxLycbvE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=JngvOrh/7RH2K28ggppoS4NPOaZa16P0lMCoxQdm8Y5sORQtjxmHS2nRWh7A+nD4U lR6pGdNIo04IsFUKW5Iu2DeZy5RCXDzqAoufI7eiLPS9ULkCP3Objs0zsXamRb15xM 79g8rzGAvghuXLj6fzSyLmOEqrVRnC+EMjOuSpSI= From: Yeoreum Yun Date: Wed, 02 Sep 2026 12:56:04 +0100 Subject: [PATCH RFC v3 02/21] ARM: mm: make 2-level pgd_t a scalar MIME-Version: 1.0 Message-Id: <20260902-dummy_ptxp3-v3-2-5d8f5b17c25c@arm.com> References: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@arm.com> In-Reply-To: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@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=2017; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=uhcO6NTPYBqTkI+U1pSNHYmMsIjTOQrElUAua45fg4s=; b=kA0DAAoBbdXD0VrFMTMByyZiAGqYDuKh4pUBsXDB1v/n9ZVHNsXgpbZHusYBh6IUK6klb7xYB YkBswQAAQoAHRYhBC2D4JLdBTO4WHWknW3Vw9FaxTEzBQJqmA7iAAoJEG3Vw9FaxTEz0BQL/2nk sf3h4xmh3cZtnS+lTvf+itMKAMxUvApGWmC4Wv39xE1jps4ZQyzWb/SJp98V66g00L30MWVLQgD tat6tOwX2/q+6qy17JKwUz/7i6TzD/TZzQ32xBFcvYhluUlq4Pz649NjIZ1uEl17UZziViJLQZo B644h4n9Wc3Fi0IzgaW+5KhHLWdt3ZRDR4WZpZi7IjFTFL9oWkZy+PhQQbx81hRv7nsS9YwgULP fPyvywMC5/BRNiJv4Bv2rw2drYfgLwbtkRYVXdzToW0jskEmlweWHUbj/LEfWkimMjxMWvghuAo Oeu5Ftb+6z/NoWkVWxtiZgTWcKlD6bqJRc4X95Ub5E3L9cgOVL/seXRA+oZwAczjdUHNqa91mAl pnh0MNHv3f/9NAQhLk8LtdSDcYIXBjJ6AbC+3whUFU8/q87D2oQ4K6sGHgvH6W2nYMjrBVc4by4 tF8lhm2Doykt9IqmrtjwiMUDhbIJElBOahrbMYMCzbEgkFh+2nRz6QH8GanA== X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260902_045652_024522_F26D74C3 X-CRM114-Status: GOOD ( 14.74 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 650e793f4142..805044ea315b 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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv