The patch titled
Subject: nios2: add support for folded p4d page tables
has been added to the -mm tree. Its filename is
nios2-add-support-for-folded-p4d-page-tables.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/nios2-add-support-for-folded-p4d-page-tables.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/nios2-add-support-for-folded-p4d-page-tables.patch
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------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Subject: nios2: 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/20200227084608.18223-6-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Guan Xuetao <gxt@xxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
Cc: Julien Thierry <julien.thierry.kdev@xxxxxxxxx>
Cc: Ley Foon Tan <ley.foon.tan@xxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/nios2/include/asm/pgtable.h | 3 +--
arch/nios2/mm/fault.c | 9 +++++++--
arch/nios2/mm/ioremap.c | 6 +++++-
3 files changed, 13 insertions(+), 5 deletions(-)
--- a/arch/nios2/include/asm/pgtable.h~nios2-add-support-for-folded-p4d-page-tables
+++ a/arch/nios2/include/asm/pgtable.h
@@ -22,7 +22,6 @@
#include <asm/tlbflush.h>
#include <asm/pgtable-bits.h>
-#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>
#define FIRST_USER_ADDRESS 0UL
@@ -100,7 +99,7 @@ extern pte_t invalid_pte_table[PAGE_SIZE
*/
static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
{
- pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd;
+ *pmdptr = pmdval;
}
/* to find an entry in a page-table-directory */
--- a/arch/nios2/mm/fault.c~nios2-add-support-for-folded-p4d-page-tables
+++ a/arch/nios2/mm/fault.c
@@ -245,6 +245,7 @@ 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;
@@ -256,8 +257,12 @@ vmalloc_fault:
goto no_context;
set_pgd(pgd, *pgd_k);
- 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;
pmd = pmd_offset(pud, address);
--- a/arch/nios2/mm/ioremap.c~nios2-add-support-for-folded-p4d-page-tables
+++ a/arch/nios2/mm/ioremap.c
@@ -86,11 +86,15 @@ static int remap_area_pages(unsigned lon
if (address >= end)
BUG();
do {
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
error = -ENOMEM;
- pud = pud_alloc(&init_mm, dir, address);
+ p4d = p4d_alloc(&init_mm, dir, address);
+ if (!p4d)
+ break;
+ pud = pud_alloc(&init_mm, p4d, address);
if (!pud)
break;
pmd = pmd_alloc(&init_mm, pud, address);
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxx 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
