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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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13
arch/sparc/kernel/smp_64.c
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@@ -1621,6 +1621,7 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
static void __init pcpu_populate_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -1633,7 +1634,17 @@ static void __init pcpu_populate_pte(unsigned long addr)
pgd_populate(&init_mm, pgd, new);
}
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
p4d_populate(&init_mm, p4d, new);
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;