+ openrisc-add-support-for-folded-p4d-page-tables.patch added to -mm tree

* + openrisc-add-support-for-folded-p4d-page-tables.patch added to -mm tree
@ 2020-03-01  4:38 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2020-03-01  4:38 UTC (permalink / raw)
  To: arnd, bcain, benh, catalin.marinas, christophe.leroy, dalias,
	fenghua.yu, geert+renesas, gxt, james.morse, jonas,
	julien.thierry.kdev, ley.foon.tan, linux, maz, mm-commits, mpe,
	paulus, rppt, shorne, stefan.kristiansson, suzuki.poulose,
	tony.luck, will, ysato


The patch titled
     Subject: openrisc: add support for folded p4d page tables
has been added to the -mm tree.  Its filename is
     openrisc-add-support-for-folded-p4d-page-tables.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/openrisc-add-support-for-folded-p4d-page-tables.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/openrisc-add-support-for-folded-p4d-page-tables.patch

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------------------------------------------------------
From: Mike Rapoport <rppt@linux.ibm.com>
Subject: openrisc: add support for folded p4d page tables

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

Link: http://lkml.kernel.org/r/20200227084608.18223-7-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: James Morse <james.morse@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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(-)

--- a/arch/openrisc/include/asm/pgtable.h~openrisc-add-support-for-folded-p4d-page-tables
+++ a/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__
--- a/arch/openrisc/mm/fault.c~openrisc-add-support-for-folded-p4d-page-tables
+++ a/arch/openrisc/mm/fault.c
@@ -296,6 +296,7 @@ vmalloc_fault:
 
 		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;
@@ -322,8 +323,13 @@ vmalloc_fault:
 		 * 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;
 
--- a/arch/openrisc/mm/init.c~openrisc-add-support-for-folded-p4d-page-tables
+++ a/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) {
_

Patches currently in -mm which might be from rppt@linux.ibm.com are

arm-arm64-add-support-for-folded-p4d-page-tables.patch
h8300-remove-usage-of-__arch_use_5level_hack.patch
hexagon-remove-__arch_use_5level_hack.patch
ia64-add-support-for-folded-p4d-page-tables.patch
nios2-add-support-for-folded-p4d-page-tables.patch
openrisc-add-support-for-folded-p4d-page-tables.patch
powerpc-add-support-for-folded-p4d-page-tables.patch
sh-drop-__pxd_offset-macros-that-duplicate-pxd_index-ones.patch
sh-add-support-for-folded-p4d-page-tables.patch
unicore32-remove-__arch_use_5level_hack.patch
asm-generic-remove-pgtable-nop4d-hackh.patch
mm-remove-__arch_has_5level_hack-and-include-asm-generic-5level-fixuph.patch

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