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From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Rich Felker <dalias@libc.org>,
	linux-ia64@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	linux-sh@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	linux-mm@kvack.org, Paul Mackerras <paulus@samba.org>,
	linux-hexagon@vger.kernel.org, Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu, Jonas Bonn <jonas@southpole.se>,
	linux-arch@vger.kernel.org, Brian Cain <bcain@codeaurora.org>,
	Marc Zyngier <maz@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Ley Foon Tan <ley.foon.tan@intel.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	uclinux-h8-devel@lists.sourceforge.jp,
	Fenghua Yu <fenghua.yu@intel.com>, Arnd Bergmann <arnd@arndb.de>,
	kvm-ppc@vger.kernel.org,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	openrisc@lists.librecores.org, Stafford Horne <shorne@gmail.com>,
	Guan Xuetao <gxt@pku.edu.cn>,
	linux-arm-kernel@lists.infradead.org,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Tony Luck <tony.luck@intel.com>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	linux-kernel@vger.kernel.org,
	Michael Ellerman <mpe@ellerman.id.au>,
	nios2-dev@lists.rocketboards.org, linuxppc-dev@lists.ozlabs.org,
	Mike Rapoport <rppt@kernel.org>
Subject: [PATCH v4 07/14] openrisc: add support for folded p4d page tables
Date: Tue, 14 Apr 2020 18:34:48 +0300
Message-ID: <20200414153455.21744-8-rppt@kernel.org> (raw)
In-Reply-To: <20200414153455.21744-1-rppt@kernel.org>

From: Mike Rapoport <rppt@linux.ibm.com>

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and remove usage of __ARCH_USE_5LEVEL_HACK.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
 arch/openrisc/include/asm/pgtable.h |  1 -
 arch/openrisc/mm/fault.c            | 10 ++++++++--
 arch/openrisc/mm/init.c             |  4 +++-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
index 7f3fb9ceb083..219979e57790 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -21,7 +21,6 @@
 #ifndef __ASM_OPENRISC_PGTABLE_H
 #define __ASM_OPENRISC_PGTABLE_H
 
-#define __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nopmd.h>
 
 #ifndef __ASSEMBLY__
diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
index 8af1cc78c4fb..6e0a11ac4c00 100644
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -295,6 +295,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 
 		int offset = pgd_index(address);
 		pgd_t *pgd, *pgd_k;
+		p4d_t *p4d, *p4d_k;
 		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
@@ -321,8 +322,13 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 		 * it exists.
 		 */
 
-		pud = pud_offset(pgd, address);
-		pud_k = pud_offset(pgd_k, address);
+		p4d = p4d_offset(pgd, address);
+		p4d_k = p4d_offset(pgd_k, address);
+		if (!p4d_present(*p4d_k))
+			goto no_context;
+
+		pud = pud_offset(p4d, address);
+		pud_k = pud_offset(p4d_k, address);
 		if (!pud_present(*pud_k))
 			goto no_context;
 
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index 1f87b524db78..2536aeae0975 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -71,6 +71,7 @@ static void __init map_ram(void)
 	unsigned long v, p, e;
 	pgprot_t prot;
 	pgd_t *pge;
+	p4d_t *p4e;
 	pud_t *pue;
 	pmd_t *pme;
 	pte_t *pte;
@@ -90,7 +91,8 @@ static void __init map_ram(void)
 
 		while (p < e) {
 			int j;
-			pue = pud_offset(pge, v);
+			p4e = p4d_offset(pge, v);
+			pue = pud_offset(p4e, v);
 			pme = pmd_offset(pue, v);
 
 			if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
-- 
2.25.1

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  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14 15:34 [PATCH v4 00/14] mm: remove __ARCH_HAS_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 01/14] h8300: remove usage of __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 02/14] arm: add support for folded p4d page tables Mike Rapoport
     [not found]   ` <CGME20200507121658eucas1p240cf4a3e0fe5c22dda5ec4f72734149f@eucas1p2.samsung.com>
2020-05-07 12:16     ` Marek Szyprowski
2020-05-07 16:11       ` Mike Rapoport
2020-05-08  6:53         ` Marek Szyprowski
2020-05-08 17:42           ` Mike Rapoport
2020-05-11  6:36             ` Marek Szyprowski
2020-05-11 14:15               ` Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 03/14] arm64: " Mike Rapoport
2020-05-15 18:40   ` Andrew Morton
2020-05-16 17:20     ` Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 04/14] hexagon: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 05/14] ia64: add support for folded p4d page tables Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 06/14] nios2: " Mike Rapoport
2020-04-14 15:34 ` Mike Rapoport [this message]
2020-04-14 15:34 ` [PATCH v4 08/14] powerpc: " Mike Rapoport
2020-06-03 19:05   ` Andrew Morton
2020-06-04  9:50     ` Qian Cai
2020-04-14 15:34 ` [PATCH v4 09/14] sh: fault: Modernize printing of kernel messages Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 10/14] sh: drop __pXd_offset() macros that duplicate pXd_index() ones Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 11/14] sh: add support for folded p4d page tables Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 12/14] unicore32: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 13/14] asm-generic: remove pgtable-nop4d-hack.h Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 14/14] mm: remove __ARCH_HAS_5LEVEL_HACK and include/asm-generic/5level-fixup.h Mike Rapoport

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