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sparc64: add support for folded p4d page tables

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Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Rapoport
2019-11-24 10:57:20 +02:00
committed by David S. Miller
parent 9167bd9634
commit 5637bc5048
7 changed files with 84 additions and 32 deletions
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6
arch/sparc/include/asm/pgalloc_64.h
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@@ -16,12 +16,12 @@
extern struct kmem_cache *pgtable_cache;
static inline void __pgd_populate(pgd_t *pgd, pud_t *pud)
static inline void __p4d_populate(p4d_t *p4d, pud_t *pud)
{
pgd_set(pgd, pud);
p4d_set(p4d, pud);
}
#define pgd_populate(MM, PGD, PUD) __pgd_populate(PGD, PUD)
#define p4d_populate(MM, P4D, PUD) __p4d_populate(P4D, PUD)
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{

24
arch/sparc/include/asm/pgtable_64.h
View File

@@ -13,7 +13,7 @@
* the SpitFire page tables.
*/
#include <asm-generic/5level-fixup.h>
#include <asm-generic/pgtable-nop4d.h>
#include <linux/compiler.h>
#include <linux/const.h>
#include <asm/types.h>
@@ -810,9 +810,9 @@ static inline int pmd_present(pmd_t pmd)
#define pud_bad(pud) (pud_val(pud) & ~PAGE_MASK)
#define pgd_none(pgd) (!pgd_val(pgd))
#define p4d_none(p4d) (!p4d_val(p4d))
#define pgd_bad(pgd) (pgd_val(pgd) & ~PAGE_MASK)
#define p4d_bad(p4d) (p4d_val(p4d) & ~PAGE_MASK)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
@@ -859,13 +859,13 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
#define pud_present(pud) (pud_val(pud) != 0U)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0UL)
#define pgd_page_vaddr(pgd) \
((unsigned long) __va(pgd_val(pgd)))
#define pgd_present(pgd) (pgd_val(pgd) != 0U)
#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
#define p4d_page_vaddr(p4d) \
((unsigned long) __va(p4d_val(p4d)))
#define p4d_present(p4d) (p4d_val(p4d) != 0U)
#define p4d_clear(p4dp) (p4d_val(*(p4dp)) = 0UL)
/* only used by the stubbed out hugetlb gup code, should never be called */
#define pgd_page(pgd) NULL
#define p4d_page(p4d) NULL
static inline unsigned long pud_large(pud_t pud)
{
@@ -884,8 +884,8 @@ static inline unsigned long pud_pfn(pud_t pud)
/* Same in both SUN4V and SUN4U. */
#define pte_none(pte) (!pte_val(pte))
#define pgd_set(pgdp, pudp) \
(pgd_val(*(pgdp)) = (__pa((unsigned long) (pudp))))
#define p4d_set(p4dp, pudp) \
(p4d_val(*(p4dp)) = (__pa((unsigned long) (pudp))))
/* to find an entry in a page-table-directory. */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
@@ -896,8 +896,8 @@ static inline unsigned long pud_pfn(pud_t pud)
/* Find an entry in the third-level page table.. */
#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
#define pud_offset(pgdp, address) \
((pud_t *) pgd_page_vaddr(*(pgdp)) + pud_index(address))
#define pud_offset(p4dp, address) \
((pud_t *) p4d_page_vaddr(*(p4dp)) + pud_index(address))
/* Find an entry in the second-level page table.. */
#define pmd_offset(pudp, address) \