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powerpc/book3s: Use config independent helpers for page table walk

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Even when we have HugeTLB and THP disabled, kernel linear map can still be
mapped with hugepages. This is only an issue with radix translation because hash
MMU doesn't map kernel linear range in linux page table and other kernel
map areas are not mapped using hugepage.

Add config independent helpers and put WARN_ON() when we don't expect things
to be mapped via hugepages.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2019-05-14 11:33:00 +05:30
committed by Michael Ellerman
parent 259a948c4b
commit d6eacedd1f
9 changed files with 102 additions and 33 deletions
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12
arch/powerpc/mm/pgtable_64.c
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@@ -309,16 +309,20 @@ EXPORT_SYMBOL(__iounmap_at);
/* 4 level page table */
struct page *pgd_page(pgd_t pgd)
{
if (pgd_huge(pgd))
if (pgd_is_leaf(pgd)) {
VM_WARN_ON(!pgd_huge(pgd));
return pte_page(pgd_pte(pgd));
}
return virt_to_page(pgd_page_vaddr(pgd));
}
#endif
struct page *pud_page(pud_t pud)
{
if (pud_huge(pud))
if (pud_is_leaf(pud)) {
VM_WARN_ON(!pud_huge(pud));
return pte_page(pud_pte(pud));
}
return virt_to_page(pud_page_vaddr(pud));
}
@@ -328,8 +332,10 @@ struct page *pud_page(pud_t pud)
*/
struct page *pmd_page(pmd_t pmd)
{
if (pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
if (pmd_is_leaf(pmd)) {
VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd)));
return pte_page(pmd_pte(pmd));
}
return virt_to_page(pmd_page_vaddr(pmd));
}